Updated on 2021/09/10

写真a

 
HANJI Takeshi
 
Organization
Graduate School of Engineering Civil and Environmental Engineering 4 Associate professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Architecture
Title
Associate professor
Contact information
メールアドレス

Degree 2

  1. Doctor of Engineering ( 2006.3   Nagoya University ) 

  2. Master of Engineering ( 2003.3   Nagoya University ) 

Research Interests 6

  1. image analysis

  2. maintenance

  3. welding

  4. fracture

  5. fatigue

  6. steel structures

Research Areas 1

  1. Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering  / Steel Structure/Bridge Engineering/Earthquake Engineering/Maintenance Management Engineering

Current Research Project and SDGs 5

  1. Fracture Mechanics Approach to Steel Bridges

  2. Application of Image Analysis to Civil Engineering

  3. Low Cycle Fatigue of Civil Steel Structures

  4. Fatigue and Fracture of Steel Structures

  5. Repair and Retrofiting Method for Steel Bridges

Research History 6

  1. Nagoya University   Associate professor

    2010.9

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    Country:Japan

  2. Tokyo Institute of Technology   Researcher

    2009.3 - 2010.8

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    Country:Japan

  3. Nagoya University   Researcher

    2007.4 - 2009.2

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    Country:Japan

  4. Japan Society for the Promotion of Science   Research Fellow (PD)

    2006.4 - 2007.3

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    Country:Japan

  5. University of California, San Diego, USA   Visiting scholar

    2006.4 - 2007.3

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    Country:Japan

  6. Japan Society for the Promotion of Science   Research Fellow (DC2)

    2005.4 - 2006.3

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    Country:Japan

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Education 3

  1. Nagoya University   Graduate School of Engineering   Department of Civil Engineering

    2003.4 - 2006.3

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    Country: Japan

  2. Nagoya University   Graduate School of Environmental Studies   Department of Environmental Engineering and Architecture

    2001.4 - 2003.3

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    Country: Japan

  3. Nagoya University   School of Engineering   Department of Civil Engineering

    1997.4 - 2001.3

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    Country: Japan

Professional Memberships 5

  1. Japan Society of Civil Engineers

  2. Japanese Society of Steel Construction

  3. Japan Welding Society

  4. IABSE

  5. The Society of Materials Science, Japan

Committee Memberships 58

  1. 首都高速道路技術センター   首都高速道路の保全技術に関するアドバイザー  

    2021.9   

  2. 土木学会:構造工学委員会:論文集編集小委員会   委員  

    2021.8   

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    Committee type:Academic society

  3. 土木学会:鋼構造委員会   委員兼幹事  

    2021.7   

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    Committee type:Academic society

  4. 名古屋高速道路公社:名古屋都心アクセス構造検討委員会   委員  

    2021.5   

  5. 東海旅客鉄道:東海道新幹線土木構造物調査委員会   委員(鋼分科会)  

    2021.4   

  6. 日本道路協会:鋼橋小委員会:鋼橋設計WG   委員  

    2020.12   

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    Committee type:Academic society

  7. 鉄道総合技術研究所:鋼・合成構造物の設計に関する委員会・幹事会   委員兼幹事  

    2020.11   

  8. 愛知県都市整備協会:令和2年度道路橋定期点検 診断結果評価会議   構成員  

    2020.10 - 2021.3   

  9. 日本鋼構造協会:鋼橋の構造性能と耐久性能研究委員会   委員  

    2020.7   

  10. 日本鋼構造協会:鋼橋の構造性能と耐久性能研究委員会:疲労性能研究部会   幹事長  

    2020.7   

  11. 東海旅客鉄道:東海道新幹線土木構造物調査委員会   委員(鋼分科会)  

    2020.4 - 2021.3   

  12. 愛知県都市整備協会:令和元年度道路橋定期点検 診断結果評価会議   構成員  

    2019.11 - 2020.3   

  13. 土木学会:鋼床版の維持管理と更新に関する調査研究小委員会   幹事  

    2019.7   

  14. 国土交通省:日ASEAN共同研究国内検討会の検討委員会   委員  

    2019.7   

  15. 西日本旅客鉄道:鋼・合成鉄道橋維持管理・更新に関する検討委員会   委員  

    2019.7   

  16. 東海旅客鉄道:東海道新幹線土木構造物調査委員会   委員(鋼分科会)  

    2019.4 - 2020.3   

  17. 中日本高速道路:鋼床版疲労き裂の対策指針作成検討会   委員  

    2019.1 - 2020.9   

  18. 愛知県都市整備協会:平成30年度道路橋定期点検 診断結果評価会議   構成員  

    2018.11 - 2019.3   

  19. 土木学会:構造工学委員会:若手構造技術者連絡小委員会   副委員長  

    2018.8   

  20. 日本道路協会:鋼橋小委員会:耐久性WG   委員  

    2018.6   

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    Committee type:Academic society

  21. 日本道路協会:耐震設計小委員会:耐震設計便覧WG   委員  

    2018.6   

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    Committee type:Academic society

  22. 日本道路協会:鋼橋小委員会:設計便覧WG   委員  

    2018.6 - 2020.5   

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    Committee type:Academic society

  23. 日本鋼構造協会:鋼橋の強靱化・長寿命化研究委員会 第II期:疲労強度研究部会   幹事長  

    2018.6 - 2020.3   

  24. 土木学会:土木学会論文集編集委員会:A1分冊編集小委員会   幹事長  

    2018.6 - 2019.5   

  25. 土木学会:論文賞選考委員会   幹事  

    2018.6 - 2019.5   

  26. 土木学会:複合構造委員会:複合構造物の疲労照査法に関する調査研究小委員会   幹事長  

    2017.12 - 2020.1   

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    Committee type:Academic society

  27. 愛知県都市整備協会:平成29年度道路橋定期点検 診断結果評価会議   構成員  

    2017.11 - 2018.3   

  28. 中日本高速道路:鋼床版疲労亀裂に対する点検・診断マニュアル検討会   委員  

    2017.10 - 2018.3   

  29. 日本道路協会:耐震設計小委員会:耐震補強事例集作成WG   幹事  

    2017.6 - 2018.5   

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    Committee type:Academic society

  30. 土木学会:土木学会論文集編集委員会:A1分冊編集小委員会   幹事  

    2017.6 - 2018.5   

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    Committee type:Academic society

  31. 土木学会:構造工学委員会:論文集編集小委員会   幹事  

    2017.5 - 2018.4   

  32. 日本鋼構造協会:土木鋼構造診断士更新・広報小委員会   委員  

    2017.4   

  33. 土木学会:鋼構造委員会:鋼・合成構造標準示方書総括小委員会   幹事長  

    2017.4 - 2021.4   

  34. 土木学会:複合構造委員会:複合構造標準示方書小委員会   委員  

    2016.10   

  35. 土木学会:構造工学委員会:数値解析による道路橋床版の構造検討小委員会   委員  

    2016.9 - 2019.8   

  36. 日本道路協会:鋼橋小委員会:耐荷力・構造WG   幹事  

    2016.6 - 2018.5   

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    Committee type:Academic society

  37. 日本道路協会:鋼橋小委員会:耐久性WG   幹事  

    2016.6 - 2018.5   

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    Committee type:Academic society

  38. 中日本高速道路:大型伸縮装置損傷対策幹事会(名古屋支社管内 橋梁保全検討委員会)   幹事  

    2016.6 - 2018.3   

  39. 土木学会:構造工学委員会:論文集編集小委員会   幹事長  

    2016.5 - 2017.4   

  40. 東海構造研究グループ:LRFR研究委員会   委員長  

    2015.10 - 2017.10   

  41. 土木学会:構造工学委員会:論文集編集小委員会   幹事  

    2015.5 - 2016.4   

  42. 日本鋼構造協会:鋼橋の強靱化・長寿命化研究委員会:疲労強度研究部会   幹事長  

    2015.4 - 2018.3   

  43. 日本道路協会:鋼橋小委員会:部分係数設計法WG   幹事  

    2015.4 - 2016.5   

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    Committee type:Academic society

  44. 土木学会:全国大会委員会:プログラム編成会議   委員  

    2015.4 - 2015.9   

  45. 溶接学会:溶接疲労強度研究委員会   委員  

    2014.7   

  46. 土木学会:全国大会委員会:プログラム編成会議   委員  

    2014.4 - 2014.9   

  47. 土木学会:鋼構造委員会:鋼・合成構造標準示方書小委員会:設計部会   幹事  

    2013.7 - 2016   

  48. 土木学会:構造工学委員会:論文集編集小委員会   委員  

    2013.7 - 2015.4   

  49. 日本鋼構造協会:鋼橋の性能・信頼性向上に関する研究委員会:疲労強度研究部会   委員  

    2013.4 - 2015.3   

  50. 土木学会:全国大会委員会:プログラム編成会議   委員  

    2013.4 - 2013.9   

  51. 中日本ハイウェイエンジニアリング東京:道路情報板支柱の損傷対策検討会   委員  

    2013.3 - 2013.10   

  52. 中日本高速道路:名古屋支社管内 マウラージョイント損傷対策幹事会(橋梁保全検討委員会)   幹事  

    2012.10 - 2016.6   

  53. 土木学会:鋼構造委員会:長周期・長時間地震動下における鋼構造物の力学挙動に関する調査研究小委員会   幹事長  

    2012.10 - 2015.9   

  54. 土木学会:全国大会委員会:プログラム編成会議   委員  

    2012.4 - 2012.9   

  55. 土木学会:中部支部:地域WG   事務局  

    2011.5 - 2012.5   

  56. 土木学会:鋼構造委員会:鋼橋の疲労対策に関する新技術調査研究小委員会   委員  

    2010.12 - 2013.3   

  57. 日本鋼構造協会:鋼橋の性能・信頼性向上に関する研究委員会:疲労強度研究部会   委員  

    2010.9 - 2013.3   

  58. 日本鋼構造協会:鋼橋の性能・信頼性向上に関する研究委員会:疲労耐久性向上部会   委員  

    2008.4 - 2009.3   

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Awards 16

  1. 構造工学論文集Vol.66A論文賞

    2020.5   土木学会   未溶着部を含む十字溶接継手の低サイクル疲労評価

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  2. 2019年度日本鋼構造協会論文賞

    2019.11   日本鋼構造協会   鋼管集成橋脚に設けられたせん断パネルダンパー溶接部の低サイクル疲労評価手法

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  3. 平成30年度土木学会田中賞(論文部門)

    2019.6   土木学会   当て板によるストップホール部の応力集中低減効果

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  4. Presentation Award in the 73rd annual meeting, JSCE

    2018.11   JSCE  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  5. 第64回構造工学シンポジウム論文賞(土木部門)

    2018.5   土木学会   当て板によるストップホール部の応力集中低減効果

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  6. 2017年度日本鋼構造協会論文賞

    2017.11   日本鋼構造協会   繰返し大ひずみ下の鋼材の疲労き裂進展速度式と溶接継手のき裂進展予測への適用

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  7. 平成28年度土木学会田中賞(論文部門)

    2017.6   土木学会   すみ肉溶接継手のルートき裂に対する変位基準の疲労強度評価法

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  8. 構造工学論文集Vol.63A優秀査読者賞

    2017.4   土木学会  

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  9. Presentation Award in the 67th annual meeting, JSCE

    2012.11   JSCE  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  10. 平成23年度溶接学会論文奨励賞

    2012.4   溶接学会   未溶着部を有する軟質溶接継手の低サイクル疲労特性

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  11. Presentation Award in the 19th Symposium, JSSC

    2011.11   JSSC  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  12. Presentation Award in the 66th annual meeting, JSCE

    2011.11   JSCE  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  13. Presentation Award in the 64th annual meeting, JSCE

    2009.11   JSCE  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  14. Presentation Award in the 15th Symposium, JSSC

    2007.11   JSSC  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  15. 第51回構造工学シンポジウム論文賞(土木部門)

    2005.5   土木学会   溶接部を対象とした極低サイクル疲労強度予測モデル

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  16. Presentation Award in the 59th annual meeting, JSCE

    2004.11   JSCE  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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Papers 176

  1. Weld crack and opening and closing behavior of root gap during welding under cyclic loading Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 77 ( 2 ) page: 287-303   2021.8

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    This study investigated opening and closing behavior of root gap and weld crack occurrence in slit-welding under cyclic loading through welding tests and thermal elasto-plastic finite element analysis. Sectional observations after the welding test revealed that the crack occurrence highly depends on the magnitude of root gap opening displacement and loading frequency in welding process, and also restraint intensity of slits. Then, through the simulation of welding under cyclic loading, it was clarified that root gap opening behavior during welding changes due to the restraint intensity of the slit, which correlates the tendency of the crack occurrence under different restraint conditions. Based on the test and analysis results, a conditional expression for the weld crack occurrence consist of the initial root gap opening displacement, loading frequency and restraint intensity of slits was obtained, and its validity was verified by the experiments.

    DOI: 10.2208/jscejseee.77.2_287

  2. Fatigue evaluation for root cracks in U-rib to deck welded joints of orthotropic steel decks Reviewed

    Masafumi Hattori, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 77 ( 2 ) page: 255-270   2021.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    This paper examines a fatigue evaluation method for the cracks in the weld joints between a U-rib and a deck plate in orthotropic steel bridge decks. The crack initiates from the weld root and propagates into the deck plate or the weld bead. Fatigue tests and FE analyses were conducted in order to examine the local stresses available for fatigue assessment, and to propose a method to estimate them from some reference stresses around the weld joint. In addition, based on fatigue crack propagation analyses, a method to predict the crack propagation path was proposed.

    DOI: 10.2208/jscejseee.77.2_255

  3. Fatigue strength and residual stress of longitudinal attachment joints improved by HFMI treatment under static load Reviewed

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu

    The 74th Annual Assembly of International Institute of Welding     page: XIII-2903-2021   2021.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    In this study, the effect of the stress state of a welded joint during application of high-frequency mechanical impact (HFMI) treatment on the resulting fatigue strength was investigated through fatigue tests and finite element analysis. A high-frequency impact treatment tool was used as the HFMI device. Longitudinal attachment welded joints were treated under a state in which a static load was applied and subsequently tested under a constant stress amplitude with stress ratios of 0 or 0.5. The test results indicate that improved fatigue strength can be achieved even under a high stress ratio when the joint is treated under the minimum stress of fatigue loading. In addition, residual stress measurements and finite element analysis simulating welding and treatment processes indicated that the magnitude of compressive residual stress introduced to a weld toe is almost the same regardless of the stress state in the joint during treatment.

  4. Prediction of residual stress induced by high-frequency mechanical impact treatment Reviewed

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu

    The 74th Annual Assembly of International Institute of Welding     page: XIII-2904-2021   2021.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    In this study, a method for predicting residual stress introduced by high-frequency mechanical impact (HFMI) was investigated using energetics. Steel plates of different grades were treated by a high-frequency impact treatment device under different treatment conditions (such as intensity of impact, number of passes, and treatment length). In addition, the motion of the HFMI indenter was recorded using a high-speed camera during the treatment, and a simple calculation method for the energy applied to steel plates was proposed. The results confirmed that the compressive residual stress introduced to the steel plates correlated closely with the calculated energy. In addition, experiments demonstrated that the energy-based residual stress prediction is applicable to a longitudinal attachment welded joint with sufficient accuracy.

  5. Local stress based fatigue assessment of welded joints in steel-concrete composite slab using angle-shape shear connectors Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Koichi Asano, Takaaki Ishii, Kiyoshi Kobayashi, Daisuke Uchida

    Proceedings of the 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)     page: 2673-2681   2021.4

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    This study investigated the fatigue strength of welded joints in steel-concrete composite slabs by fatigue testing. In addition, the local stress around the welded joint was evaluated through finite element analysis. In the test, fatigue cracks occurred at the toes of boxing welds of angle-shape shear connectors as a result of stress concentration due to the local out-of-plane bending deformation of the steel plates around the boxing weld. This local deformation can be produced by the steel and concrete behaving independent of one another locally near welds when the bond at their interface is lost. The test results demonstrated that the fatigue assessment of welded joints in a composite slab can be performed using the hot-spot stress approach. Then, actual composite slabs with different structural characteristics were analyzed to investigate the local stress behavior around welded joints, and their fatigue performance was assessed based on the hot-spot stress approach.

    DOI: 10.1201/9780429279119-365

  6. Reduction of stress concentration at drilled hole due to adding splice plates Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Proceedings of the 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)     page: 3531-3539   2021.4

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    A typical repair method for fatigue cracks in steel bridge members is the splice plate method. The crack tip is drilled out and splice plates are added over the crack. For evaluating the remaining fatigue life of the repaired members, the stress at a drilled crack-arrest hole after the addition of the splice plates with high-strength bolts is required. In this study, the effect of the geometric parameters of the splice plate on stress reduction at a drilled crack-arrest hole is investigated using static loading tests and parametric finite element analyses. Based on the results, a method for predicting the stress at the drilled hole that considers the load-carrying mechanism through the bolted splice plate is proposed. It is demonstrated that the proposed method can predict stress with an error of within 10%.

    DOI: 10.1201/9780429279119-478

  7. Crack sizing accuracy of a phased array ultrasonic scanner developed for inspection of rib-to-deck welded joints in orthotropic steel bridge decks Reviewed

    Masafumi Hattori, Tohru Makita, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Naoto Yagi

    Proceedings of the 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)     page: 3946-3954   2021.4

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    Fatigue cracks have been observed at welded joints between U-ribs and deck plates in many orthotropic steel decks. Considering a fatigue crack at rib-to-deck welded joints can compromise transportation safety, it is necessary to detect and repair the crack at the early development stage.
    This paper presents the accuracy of crack sizing with a Phased Array Ultrasonic Testing (PAUT) scanner developed for inspection. Firstly, an internal crack propagating from a weld root was induced at rib-to-deck welded joints by using a plate bending fatigue testing machine. Subsequently, the joints were inspected with the PAUT scanner. Appropriate sizing methods were determined for the deck and weld bead propagation type cracks, respectively, and the accuracy of crack sizing was evaluated. In addition, the influence of coating on the accuracy in crack sizing was examined. As a result, it is demonstrated that the PAUT scanner had enough crack sizing performance.

    DOI: 10.1201/9780429279119-540

  8. Fatigue behavior of bearing type bolted joint with pultruded CFRP composites Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Yasuo Kitane

    Proceedings of the 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)     page: 3657-3663   2021.4

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    Carbon Fiber Reinforced Polymer (CFRP) composites, consisting of carbon fiber and matrix resin, has high stiffness and tensile strength. Recently, pultrusion method is developed for manufacturing CFRP composites. The bearing type bolted joint is typically adopted for permanent joint of CFRP composites. Due to bearing pressure around bolt hole, fatigue damage can be introduced around bolt hole in a bearing type bolted joint. In this study, fatigue performance of bearing type bolted joint with the pultruded CFRP composite was examined. To observe fatigue crack generation and propagation around bolt hole, tensile fatigue test on pultruded CFRP composites with a circular hole was performed. While fatigue crack was generated from the edge of the hole and propagates in longitudinal direction, the CFRP composites was not ruptured during the test. The fatigue test on a bearing type bolted joint for pultruded CFRP composites was also performed, and its fatigue strength was clarified. Finite element analysis (FEA) simulating multiple layer was constructed. The stress distribution around bolt hole was examined from FEA. The fatigue strength was arranged by maximum principal stress range.

    DOI: 10.1201/9780429279119-496

  9. Investigation on low cycle fatigue crack propagation in steel under fully random variable amplitude loading Reviewed

    Arief Panjaitan, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    Journal of Structural Engineering, JSCE   Vol. 67A   page: 174-182   2021.4

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    Low cycle fatigue is a failure mode which is possibly caused by random large strains such as seismic motion. To examine the effects, this study elaborated crack propagation behavior in steel under random amplitude loading. Firstly, study on crack growth rate under constant amplitude conditions was conducted to obtain basic characteristics. Next, several patterns of random amplitude loading were applied. It is discovered that crack growth accelerated when amplitude decreased from high to low levels at tensile portions, compared to that in constant amplitude conditions. Prediction model was constructed with establishing relationship between cyclic J-integral range and crack growth rate and confirmed to give good estimation.

    DOI: 10.11532/structcivil.67A.174

  10. Charpy impact tests on low-yield point steel subjected to thermal cycle and pre-strain Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Yasumoto Aoki

    Steel Construction Engineering, JSSC   Vol. 28 ( 109 ) page: 183-190   2021.3

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    Low-yield point steel has been used in seismic control dampers due to its high energy absorption ability. Meanwhile, thermal cycle during welding can change mechanical properties and microstructure of low-yield point steel. In addition, large plastic strains caused by seismic motion can induce defects in microstructure. They can cause the reduction in toughness of the low-yield point steel. In this study, Charpy impact tests were performed for low-yield point steel with thermal cycle simulating heat affected zone and preliminary plastic strain. Significant reduction in Charpy absorbed energy was observed when applying simulated thermal cycle, while the preliminary strain gives insignificant reduction.

  11. Simplified analysis method for estimation of strain at drilled crack-arrest hole with bolted splices Reviewed

    Shogo Kiyokawa, Takeshi Hanji, Ryojiro Kato

    Steel Construction Engineering, JSSC   Vol. 28 ( 109 ) page: 155-168   2021.3

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    The drilled crack-arrest hole and the attaching splices by high strength bolts are often used in combination as retrofit for fatigue cracks in steel structures. In this case, in order to evaluate the remaining fatigue life, it is important to accurately estimate the strain at the crack-arrest hole. Non-linear FE analysis considered the friction contact was often applied for the strain estimation in previous researches. In this study, a linear analysis model with simplified meshing was newly introduced. Through static loading tests and parametric FE analyses, it was verified that the model can estimate the strain at the hole with practically sufficient accuracy.

  12. Study on low cycle fatigue crack propagation behavior under two-steps variable amplitude Reviewed

    Arief Panjaitan, Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji

    Steel Construction Engineering, JSSC   Vol. 27 ( 108 ) page: 93-103   2020.12

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  13. Countermeasure effect of UHPFRC overlay on fatigue cracks propagating from U-rib welds of orthotropic steel decks Reviewed

    Masafumi Hattori, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 76 ( 3 ) page: 542-559   2020.11

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    Over the last decade, fatigue cracks have been observed at welded joints between U-ribs and deck plates in many orthotropic steel deck bridges in Japan. Among the cracks, this paper focuses on fatigue cracks that initiate from a weld root of rib-to-deck welded joints and propagate to a deck plate. This study examines the effect of countermeasure with overlaying Ultra-High Performance Fibre Reinforced cement-based Composites (UHPFRC) on steel decks with cracks from U-rib welds, and confirms the fatigue durability of this countermeasure method. Specifically, the suppressing effect on crack propagation and the fatigue durability of UHPFRC itself and the interface between UHPFRC and the deck plate were confirmed by a wheel running test and finite element analysis. As a result, it was clarified that this countermeasure has a positive effect to retard further crack propagation compared with a countermeasure with overlaying steel fiber reinforced concrete which is generally adopted. In addition, it was revealed that this countermeasure has enough fatigue durability.

    DOI: 10.2208/jscejseee.76.3_542

  14. Local strain-based low-cycle fatigue assessment of joint structure in steel truss bridges during earthquakes Reviewed

    Chao Jiang, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    International Journal of Steel Structures   Vol. 20 ( 5 ) page: 1651-1662   2020.8

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    During the 2011 Tohoku Earthquake, a truss bridge joint structure was cracked due to large cyclic deformation, making us recognize the importance of assessing the seismic performance of joint structures in truss bridges from the viewpoint of low-cycle fatigue. In this study, seismic response analysis of an actual deck truss bridge was performed under different seismic waves, and local strain behavior generated at welded joints around a joint structure was clarified using a zooming analysis technique. The results revealed the possibility that welded joints for a lateral gusset-plate in a joint structure can be cracking sites during earthquakes. In addition, it was indicated that seismic isolation bearings can significantly reduce the local strain at the joint structure and improve its low-cycle fatigue performance. Moreover, as a simple countermeasure, weld toe treatment by grinding is also effective to decrease the possibility of low-cycle fatigue cracking at the joint structure.

    DOI: 10.1007/s13296-020-00399-1

  15. Low cycle fatigue crack propagation of steel under constant amplitude displacement histories Reviewed

    Arief Panjaitan, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    Steel Construction Engineering, JSSC   Vol. 27 ( 106 ) page: 75-80   2020.7

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    Low cycle fatigue is a failure mode exhibiting a small number of loading repetitions to failure. Former work conducting research on constant displacement amplitude presented crack growth rate was related to cyclic J-integral range, but the data were limited. This research aimed to provide additional information to cover study done at the past so that a formula for obtaining crack growth rate can be precisely proposed. Research work was conducted with applying two different cyclic displacement means of loading histories to CT specimen. Cumulative plots in crack growth rate addressed to past and current research work were found enforcing formula used for obtaining crack growth rate under larger cyclic strains proposed at the past.

    DOI: 10.11273/jssc.27.106_75

  16. Fatigue strength of transverse attachment steel joints with single-sided arc weld using low transformation temperature welding consumable Reviewed

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu, Tadahisa Tsuyama, Toshio Takebuchi

    Welding in the World   Vol. 64 ( 7 ) page: 1293–1301   2020.7

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    This study investigated the applicability of low transformation temperature (LTT) arc welding consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding, similar to rib-to-deck connections in orthotropic steel bridge decks, were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests were performed with out-of-plane bending loads using a vibration-type fatigue testing machine. The test results indicated that higher fatigue strength can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results revealed that the LTT consumable weld metal can reduce residual stress around the weld and also introduce compressive residual stress to the weld root, which can contribute to improved fatigue strength.

    DOI: 10.1007/s40194-020-00915-1

  17. Extremely low cycle fatigue assessment model for structural steel and its application to welded joints Reviewed

    Takeshi Hanji, Kazuo Tateishi

    Proceedings of the VAL4     page: CD-ROM   2020.7

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    The accuracy of Miner's rule has not been verified in an extremely large strain field, corresponding to the fatigue life of less than tens cycles. In this study, low cycle fatigue tests under variable strain amplitude in the extremely large strain field were conducted with a newly developed testing system. The result revealed that the Miner's rule always predicted a longer fatigue life than the observed life. Therefore, this study proposed a simple fatigue assessment model introducing the damage mechanics concept and examined its validity as another method for predicting low cycle fatigue life.

  18. Fatigue strength of welded joints in steel-concrete composite slab using L-shaped shear connectors Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Koichi Asano, Takaaki Ishii, Kiyoshi Kobayashi, Daisuke Uchida

    Journal of Structural Mechanics and Earthquake Engineering, JSCE (Journal of Hybrid Structures)   Vol. 76 ( 5 ) page: II_50-II_61   2020.5

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    In this study, the fatigue strength of welded joints in steel-concrete composite slabs was investigated by fatigue testing. In addition, the local stress around the welded joint was evaluated through finite element analysis. In the test, fatigue cracks occurred at the toes of boxing welds of L-shaped shear connectors as a result of stress concentration due to the local out-of-plane bending deformation of the steel plates around the boxing weld. This local deformation can be produced by the steel and concrete behaving in-dependent of one another locally near welds when the bond at their interface is lost. The test results demonstrated that the fatigue assessment of welded joints in a composite slab can be performed using the hot-spot stress approach. Then, actual composite slabs with different structural characteristics were analyzed to investigate the local stress behavior around welded joints, and their fatigue performance was assessed based on the hot-spot stress approach.

    DOI: 10.2208/jscejseee.76.5_II_50

  19. Fatigue strength of friction type high strength bolted joints with compact bolt spacing and edge distance Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 76 ( 2 ) page: 212-222   2020.5

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    Damaged steel bridge members are often repaired by patching steel plates with high strength bolts. Sometimes, due to spatial restriction, there is a need to be shorten bolt spacing or edge distance than those specified in a design specification. However, knowledge on fatigue performance of the joints with the compact bolt arrangement is little.
    In this study, fatigue strength of friction type bolted joints with compact bolt arrangement was investigated through fatigue tests and finite element analyses. The test result indicated that the compact bolt arrangement, especially a smaller end distance, decrease the fatigue strength of the joints. The analysis results demonstrated that stress concentration occured at the surface around a bolt hole where the fatigue crack initiated in the test. Since the stress concentration was strongly correlated to the fatigue strength in the test, the effects of compact bolt arrangement with a variety of material strengths and joint dimensions were discussed based on the stress concentration.

    DOI: 10.2208/jscejseee.76.2_212

  20. Low cycle fatigue evaluation of cruciform welded joints containing incomplete penetration Reviewed

    Takeshi Hanji, Yuko Ohashi, Kazuo Tateishi, Masaru Shimizu

    Journal of Structural Engineering, JSCE   Vol. 66A   page: 253-263   2020.3

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    This study examined low cycle fatigue behavior of cruciform welded joints containing incomplete penetration. Six types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the main plate thickness, respectively. Then, elasto-plastic finite element analyses including the effective notch concept were performed. The results indicate that the fatigue strength and cracking pattern of the specimens can be correlated with the local strain distribution around the effective notch.

    DOI: 10.11532/structcivil.66A.253

  21. Fatigue strength of weld root in transverse attachment joints with single-sided weld using low transformation temperature welding consumable Reviewed

    Takeshi Hanji, Suguru Kano, Kazuo Tateishi, Masaru Shimizu, Tadahisa Tsuyama, Toshio Takebuchi

    Journal of Structural Engineering, JSCE   Vol. 66A   page: 607-616   2020.3

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    This study investigated the applicability of low transformation temperature (LTT) welding consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests with out-of-plane bending loads revealed that higher fatigue strength and fatigue limit can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results indicated that the LTT consumable can reduce tensile residual stress around the weld and also introduce compressive residual stress to the weld root.

    DOI: 10.11532/structcivil.66A.607

  22. Effect of weld penetration on low cycle fatigue strength of load-carrying cruciform joints Reviewed

    Takeshi Hanji, Kazuo Tateishi, Yuko Ohashi, Masaru Shimizu

    Welding in the World   Vol. 64 ( 2 ) page: 327-334   2020.1

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    This study examined the low-cycle fatigue behavior of load-carrying cruciform-welded joints containing incomplete penetration. Five types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. During testing, cracking behavior was observed on the side surface of the specimen. The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the 5main plate thickness, respectively. Elasto-plastic finite element analyses including the effective notch concept were then performed. The results indicate that the fatigue strength and cracking pattern of the specimens can be correlated with the local strain distribution around the effective notch.

    DOI: 10.1007/s40194-019-00834-w

  23. Estimation method for low cycle fatigue of welded joint in shear panel damper Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Yasumoto Aoki

    Journal of Constructional Steel   Vol. 27   page: 741-748   2019.11

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    A shear panel damper can absorb seismic energy by its hysteresis damping. On the other hand, repetition of high strain around its welded joints could lead to low cycle fatigue failure. To avoid the low cycle fatigue, a simple assessment method was investigated in this study. The relationship between mean shear strain range and local strain range at a crack initiation point was examined for various shear panel dampers. From the relation, estimation equations for the local strain range at crack initiation point were established. In addition, low cycle fatigue strength curves based on the mean shear strain range were developed. Based on the fatigue strength curve, fatigue crack initiation life was discussed among the several shear panel dampers.

  24. Fatigue strength evaluation on bearing type bolted joint of pultruded CFRP member Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Yasuo Kitane, Kai Hiroyama

    Proceedings of the 13th Symposium on Research and Application of Hybrid and Composite Structures     page: 430-437   2019.11

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    In recent years, the pultrusion method for manufacturing CFRP member has been established. The environment to stably supply large-scaled CFRP members is being developed. On the other hand, mechanical behavior and fatigue behavior of the bearing type bolted joint used for connection of FRP members is not clearly understood. In this study, tensile fatigue tests on perforated plate and double shear bearing type bolted joint of pultruded CFRP were performed. The perforated plate specimen represents sperior fatigue durability over 10million cycle even under nominal stress range of 260 N/mm2. However, the fatigue crack occurs from the edge of the hole, and propagates to longitudinal direction. As for bearing type bolted joint specimen, local bearing failure was observed around the contact part between bolt and CFRP member. The shear-out failure was also observed when the nominal stress is over 70 N/mm2. Moreover, finite element analysis was performed to examine the stress around the bolt hole. Fatigue durability of pulutruded CFRP member was discussed by arranging fatigue test results with maximum principal strain obtained from the analysis.

  25. Fatigue strength of welded joints in steel-concrete composite slab using angle shape shear connectors Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Koichi Asano, Takaaki Ishii, Kiyoshi Kobayashi, Daisuke Uchida

    Proceedings of the 13th Symposium on Research and Application of Hybrid and Composite Structures     page: 189-198   2019.11

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    In this study, fatigue strength of welded joints in steel-concrete composite slabs was investigated by a fatigue test and finite element analysis. In the test, fatigue cracks occurred at toes of boxing welds of angle-shape shear connectors and propagated into a bottom plate, which were caused by stress concentration due to local out-of-plane bending deformation of steel plates around the boxing weld. This local deformation can be caused because concrete and steel plates locally behave separately near welds when bond between them is lost. The test result demonstrated that fatigue assessment of welded joints in the steel-concrete composite slab can be performed using the structural hot spot stress approach. Then, actual composite slabs with different structural dimensions were analyzed to investigate local stress behavior around welded joints, and their fatigue performance was assessed based on the hot spot stress approach.

  26. A prediction method for fatigue enhancement of drilled crack-arrest holes accompanied by splice plates Reviewed

    Takeshi Hanji, Shogo Kiyokawa, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the 12th Pacific Structural Steel Conference     page: CD-ROM   2019.11

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    The present study examined a prediction method for the strain at drilled fatigue crack-arrest holes covered by splice plates to evaluate fatigue enhancement of the hole accompanied by the splices. Finite element analyses were performed in order to establish a method to predict the strain at a drilled hole from the strain that can be measured on a splice plate. In the present study, axially loaded center-cracked steel plates repaired by adding splice plates were analyzed for various plate thicknesses of both cracked and splice plates, bolt-hole arrangements and diameters, and crack lengths. The strain on the splice around the drilled hole was correlated with the strain at the hole. Based on the results, a prediction formula for the strain at the hole, which is a function of the pitch and diameter of bolt holes near the drilled hole, was proposed. Static tensile loading tests were conducted for several center-cracked plates repaired by adding splice plates in order to verify the proposed strain-prediction method. The test results demonstrated that the strain at the drilled hole can be predicted with enough accuracy based on the strain on the splice.

  27. A proposal on reduction of welding residual stress in rib-to-deck welded joint in orthotropic steel deck Reviewed

    Cut Atika Putri, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Proceedings of the 12th Pacific Structural Steel Conference     page: CD-ROM   2019.11

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    The presence of tensile residual stress caused by the welding process, at weld root of rib-to-deck joint in Orthotropic Steel Deck (OSD), believed can trigger fatigue crack occurrence although the applied cycle stresses are compression. In this study, a new method to reduce tensile residual stress at the weld root of rib-to-deck joint in OSD is proposed. It was started with simulating the welding process by using Finite Element (FE) analysis. Various structural parameters are considered to examine its sensitivity in the tensile residual stress distribution at the weld root through the deck plate. It was found that high tensile residual stress is generated at the weld root and tend to be increased with the increase of deck plate thickness and welding penetration. The proposed method is simulated after welding analysis. In this method, the plastic deformation is applied around the weld root by external opening force after cutting the bottom part of the through-rib. The tensile residual stress at the weld root was dispersed when expanding the web plate of through-rib. Significant reduction of tensile residual stress can be obtained when the weld bead size is relatively small.

  28. Evaluation of low cycle fatigue crack propagation under various controlled cyclic loading histories Reviewed

    Arief Panjaitan, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    Proceedings of the 12th Pacific Structural Steel Conference     page: CD-ROM   2019.11

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    Low cycle fatigue, is one of the main failure modes in steel structures due to the earthquake. Earthquake acceleration leads to contribute irregular and high plastic deformation to the affected structures. However, the low cycle fatigue durability under irregular loading has not been clarified. The objective of this research is to obtain crack propagation pattern and low cycle fatigue life prediction under various loading histories. Two types of controlled displacement sequences with mixed amplitude were applied to the CT specimen. One was the series with uniform value at constant high and constant low displacement. The remain was the series with changing amplitude from high to low displacement and from low to high displacement. Experimental work and Finite Element (FE) analysis conducted gave ΔJ-integral following applied cyclic loading histories trends and predicted fatigue life curve resulted showed non linear relationship for the crack growth rate during additional value of ΔJ-Integral.

  29. Low cycle fatigue behavior of load-carrying cruciform welded joints with incomplete penetration Reviewed

    Yuko Ohashi, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the 12th Pacific Structural Steel Conference     page: CD-ROM   2019.11

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    This study examined low cycle fatigue behavior of load-carrying cruciform welded joints containing incomplete penetration. Six types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. During testing, cracking behavior was observed on the side surface of the specimen. The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the main plate thickness, respectively. Then, elasto-plastic finite element analyses including the effective notch concept were performed. The results indicate that the fatigue strength and cracking pattern of the specimens can be correlated with the local strain distribution around the effective notch.

  30. Fatigue strength of single-sided fillet welded joints with low transformation temperature welding material Reviewed

    Suguru Kano, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Tadahisa Tsuyama, Toshio Takebuchi

    Proceedings of the 12th Pacific Structural Steel Conference     page: CD-ROM   2019.11

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    This study investigated the applicability of low transformation temperature (LTT) consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding, similar to rib-to-deck connections in orthotropic steel bridge decks, were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests were performed with out-of-plane bending loads using a vibration-type fatigue testing machine. The test results indicated that higher fatigue strength can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results revealed that the LTT consumable can reduce residual stress around the weld and also introduce compressive residual stress to the weld root, which can contribute to improved fatigue strength.

  31. A study on fatigue crack propagation behavior on steel plate subjected to out of plane bending Reviewed

    Kentaro Horio, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    Proceedings of the 12th Pacific Structural Steel Conference     page: CD-ROM   2019.11

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    Under out-of-plane bending and shearing force, a crack develops in the thickness direction with an inclination toward the axial direction. Typically, three types of crack propagation behaviors can be observed; the crack develops in thickness direction up to the opposite surface, the crack is arrested after inclining toward an axial direction, and a counter crack comes from the opposite surface. In this study, the occurrence condition of each crack propagation behavior was investigated. Cyclic bending fatigue tests were conducted for notched steel plates. Furthermore, the crack propagation and counter crack occurrence were evaluated from finite element analysis. The crack propagation pass tends to be affected by the ratio between bending stress and shear stress near the crack. Also, in the case that the counter crack was generated, the strain on the opposite surface yielded.

  32. Fatigue strength of cruciform joints and longitudinal joints with laser-arc hybrid welding Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Daisuke Uchida, Koichi Asano, Ryosuke Kimura

    Welding in the World   Vol. 63 ( 5 ) page: 1379-1390   2019.9

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    This study examined the fatigue strength of cruciform joints and longitudinal joints fabricated with laser-arc hybrid welding. Load-carrying and non-load-carrying cruciform welded joints with plate thicknesses of 8, 16, and 25 mm were tested under tensile cyclic loads and out-of-plane bending cyclic loads. In longitudinal joints, four-point bending fatigue tests were performed on plate girders with flanges and a web connected by laser-arc hybrid welding. When assembling the plate girder, tack welds were installed at the flange-to-web connection to clarify their effect on the fatigue strength of the longitudinal joints. Measurements of weld toe profiles and residual stress were also conducted. The residual stress was measured using X-ray diffraction. The test results revealed that the fatigue strengths of hybrid welded joints are equivalent to those of arc welded joints and satisfy the fatigue design curves specified by the Japanese Society of Steel Construction. In addition, the effect of plate thickness on the fatigue strength was observed in hybrid welded joints as well as in arc welded joints.

    DOI: 10.1007/s40194-019-00745-w

  33. Slip coefficient and ultimate strength of high-strength bolted friction joints with compact bolt spacing and edge distance Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    International Journal of Steel Structures   Vol. 19 ( 4 ) page: 1191-1201   2019.8

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    In current design codes, the minimum bolt spacing and edge distance for high-strength bolted friction joints are specified based on the bolt diameter, regardless of the plate thickness or steel strength. However, the mechanical performance of joints with a more compact bolt spacing than that given in the current design specifications has been little examined. In this study, the slip and ultimate strength of high-strength bolted joints with a compact bolt spacing and edge distance were investigated. Tensile tests were conducted on friction-type joints with various bolt arrangements. The use of a compact bolt arrangement was not observed to have a negative influence on the slip strength in these tests. The estimated strengths corresponding to the experimentally observed failure modes were found to agree fairly well with the experimental results within a 10% error. A parametric finite element analysis was also conducted to investigate the influence of the bolt arrangement on the slip coefficient. It was concluded that the bolt spacing and edge distance have little influence on the slip coefficient.

    DOI: 10.1007/s13296-018-0199-3

  34. Fatigue strength of transverse attachment joints with single-sided weld using low transformation temperature welding consumable Reviewed

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu, Tadahisa Tsuyama, Toshio Takebuchi

    The 72nd Annual Assembly of International Institute of Welding     page: XIII-2809-19   2019.7

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    This study investigated the applicability of low transformation temperature (LTT) consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding, similar to rib-to-deck connections in orthotropic steel bridge decks, were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests were performed with out-of-plane bending loads using a vibration-type fatigue testing machine. The test results indicated that higher fatigue strength can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results revealed that the LTT consumable can reduce residual stress around the weld and also introduce compressive residual stress to the weld root, which can contribute to improved fatigue strength.

  35. Fatigue strength of laser-arc hybrid welded joints with tack welds Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Daisuke Uchida, Ryosuke Kimura, Koichi Asano

    Quarterly Journal of the Japan Welding Society   Vol. 37 ( 3 ) page: 99-107   2019.7

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    This study examined the fatigue strength of cruciform joints and longitudinal joints fabricated with laser-arc hybrid welding, in which tack welds were installed at the connection. The cruciform joints were tested under tensile cyclic loads and out-of-plane bending cyclic loads. In the longitudinal joints, four-point bending fatigue tests were performed on plate girders fabricated with the hybrid welding. In addition, finite element analysis was performed on the cruciform joint to investigate the effect of tack welds on stress concentration at weld toes. The test results revealed that the fatigue strengths of the hybrid welded joints are equivalent to those of arc welded joints with or without tack welds and satisfy the fatigue design curves specified in JSSC recommendation. Moreover, the analysis results indicated that tack welds have little influence on stress concentration at weld toes in cruciform joints fabricated with laser-arc hybrid welding.

    DOI: 10.2207/qjjws.37.99

  36. Crack sizing accuracy of a phased array ultrasonic scanner developed for inspection of rib-to-deck welded joints in orthotropic steel decks Reviewed

    Masafumi Hattori, Tohru Makita, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Naoto Yagi

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 74 ( 3 ) page: 516-530   2018.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    Over the last decade, fatigue cracks have been observed at welded joints between trapezoidal ribs and deck plates in many orthotropic steel deck bridges in Japan. Considering a fatigue crack at rib-to-deck welded joints can cause pavement damage and thus compromise transportation safety, it is necessary to detect and repair it at the early stage of its development.
    This paper presents the accuracy of crack sizing with an electrically driven phased array ultrasonic scanner (PAUT scanner) developed for inspection of rib-to-deck welded joints in orthotropic steel decks. The PAUT scanner simultaneously examines a deck plate and a weld bead into either of which cracks propagate from a weld root. Moreover, it can detect the cracks as remained in the steel members.
    In this research, firstly an internal crack is induced at rib-to-deck welded joints by using a plate bending fatigue testing machine where crack sizes are controlled by monitoring stresses at regions closed to weld beads. Subsequently, the joints are inspected with the PAUT scanner. Appropriate sizing methods are de-termined for the crack going through a deck plate and a weld bead, respectively, and the accuracy of crack sizing is evaluated by comparing with real cracks on the joints. In addition, the influence of paint coatings on the accuracy in crack sizing is examined. As a result of these investigation, it is demonstrated that the PAUT scanner has enough crack sizing performance.

    DOI: 10.2208/jscejseee.74.516

  37. Fatigue strength of laser treated weld joints Reviewed

    Cut Atika Putri, Kazuo Tateishi, Takeshi Hanji

    Steel Construction Engineering, JSSC   Vol. 25 ( 100 ) page: 73-76   2018.12

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    Service lives of steel bridges are limited by corrosion. Coating is commonly applied to steel structures in order to prevent corrosion. In recent years, a laser cleaning treatment is introduced as a new technique for surface preparation of steel structures. However, the influence of laser cleaning on fatigue life of welded joint is unknown. In this study, fatigue tests were conducted on as-welded and laser-treated out-of-plane gusset joints. The test results showed that the laser cleaning treatment only had little influence on fatigue strength of out-of-plane gusset welded joints.

    DOI: 10.11273/jssc.25.100_73

  38. Fatigue life prediction of corroded reinforcing steel bars Reviewed

    Takeshi Hanji, Niamatullah Ahmadzai, Kazuo Tateishi, Masaru Shimizu

    Journal of Constructional Steel   Vol. 26   page: 804-810   2018.11

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    This study investigated the fatigue strength of corroded reinforcing steel bars. Several types of rebars consisting of different yield stress and rib shapes were used. The rebar was galvanically corroded to three levels, which are considered as a percentage of mass reduction of 5, 10 and 15% respectively. Fatigue test results revealed that the fatigue life of the corroded rebar decreases as the corrosion level increases. Then, the fatigue life of the corroded rebar was predicted by crack propagation calculations based on fracture mechanics. There are relatively good agreements between the prediction and the test results.

  39. Slip strength of doubler plates with high-strength bolts for fatigue cracks Reviewed

    Shogo Kiyokawa, Takeshi Hanji, Masaru Shimizu, Kazuo Tateishi

    Journal of Constructional Steel   Vol. 26   page: 277-283   2018.11

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    As for retrofitting cracked bridge members, it is often used to attach doubler plates by highstrength bolts after drilling holes at crack tips. In many cases, the doubler plate is designed as frictional connections, but the slip action at the doubler plate and its slip strength have not been well known yet. In this study, tensile tests and FE analyses were conducted as a fundamental study to investigate the slip strength at the doubler plate. The result revealed that the load-sharing ratio between a main plate and doubler plates have linear correlation with the ratio of cross sectional areas of both plates. Therefore, the slip strength at the doubler plates can be designed by using the load-sharing ratio estimated by structural dimensions of the main plate and doubler plates.

  40. Fatigue strength of cruciform joints with laser-arc hybrid welding Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Daisuke Uchida, Ryosuke Kimura, Koichi Asano

    Quarterly Journal of the Japan Welding Society   Vol. 36 ( 4 ) page: 219-229   2018.10

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    This study examined fatigue strength of cruciform joints fabricated with laser-arc hybrid welding. Load-carrying and non-load-carrying cruciform welded joints with a plate thickness from 8mm to 25mm were tested under tensile cyclic loads and out-of-plane bending cyclic loads. Measurements of weld toe profile, residual stress and hardness around a welded portion were also conducted. The test results revealed that the fatigue strength of the hybrid welded joints is equivalent to that of arc welded joints and satisfies the fatigue design curves for arc welded joints in JSSC recommendation. Besides, the thickness effect on fatigue strength was observed in the hybrid welded joints as well as in arc welded joints.

    DOI: 10.2207/qjjws.36.219

  41. Fatigue cracks in I-beam end in railway steel bridges and its life extension by stop-hole repair Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Masaki Iwai, Ken Ikegashira, Yuichiro Niwa

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 74 ( 2 ) page: 290-305   2018.8

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    DOI: 10.2208/jscejseee.74.290

  42. Effect of weld penetration on low cycle fatigue strength of load-carrying cruciform joints Reviewed

    Takeshi Hanji, Kazuo Tateishi, Yuko Ohashi, Masaru Shimizu

    The 71st Annual Assembly of International Institute of Welding     page: XIII-2749-18   2018.7

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    This study examined the low cycle fatigue behavior of load-carrying cruciform welded joints containing incomplete penetration. Five types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. During testing, cracking behavior was observed on the side surface of the specimen. The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the main plate thickness, respectively. Elasto-plastic finite element analyses including the effective notch concept were then performed. The results indicate that the fatigue strength and cracking pattern of the specimens can be correlated with the local strain distribution around the effective notch.

  43. Estimation method of strain at drilled hole repaired by adding splice plates Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Yuya Nakayama

    Journal of Structural Engineering, JSCE   Vol. 64A   page: 445-454   2018.3

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    Adding splice plates is a commonly used technique to repair fatigue cracks. The crack tip is drilled out before the splice plates are add. In some cases, however, a new fatigue crack initiates from the drilled hole. Because the drilled hole is entirely covered by the splice plates, it is impossible to measure its strain that can be used to assess the crack generation from the drilled hole. The purpose of this study is to propose a method to estimate the strain of the drilled hole by using a reference strain on the splice plate. By conducting parametric FE analyses and loading tests, the location for the reference strain which is strongly correlated with the strain in the drilled hole was proposed.

    DOI: 10.11532/structcivil.64A.445

  44. Reduction of stress concentration at drilled hole due to adding splice plates Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Yuya Nakayama

    Journal of Structural Engineering, JSCE   Vol. 64A   page: 435-444   2018.3

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    A typical repair method for fatigue cracks in steel bridge members is the splice plate method. The crack tip is drilled out, and splice plates are added over the crack. For evaluating the remaining fatigue life of the repaired members, it is needed to know the stress of the drilled hole after adding splice plates. In this study, the effect of the splice plates geometric parameters on the stress reduction of a drilled hole was investigated by tensile tests and parametric FE analyses. As a result, a new method to estimate the stress of the drilled hole was proposed, considering stress carrying mechanism of the splice plate. This method could estimate the stress within 10% error.

    DOI: 10.11532/structcivil.64A.435

  45. A prediction method of local strain range at weld toe of various joints Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Naoya Honda

    Steel Construction Engineering, JSSC   Vol. 25 ( 97 ) page: 61-66   2018.3

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    Welded joints in steel structures are subjected to high strain amplitude during earthquake, which could cause a low cycle fatigue crack. To assess low cycle fatigue strength of welded joints, an estimation method based on local strain range at a crack initiation point has been established. In this method, an FE model with extremely-fine mesh is needed to obtain the local strain range accurately. In this paper, a prediction method of the local strain range from a model with relatively coarse mesh was proposed. Strain ranges obtained from coarse-mesh models were related to the local strain ranges from fine-mesh models. A prediction formula of the local strain range which is applicable to T-shaped joints, cruciform joints and out-of-plane gusset joints was established.

    DOI: 10.11273/jssc.25.97_61

  46. Low-cycle fatigue evaluation for welded joint of shear panel damper in multiple steel columns Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Hiroki Sugiyama, Yasumasa Soga, Riku Adachi, Hiroshi Noda

    Steel Construction Engineering, JSSC   Vol. 24 ( 96 ) page: 17-29   2017.12

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    Multiple Steel Columns is an earthquake-resistance bridge pier which has shear panel dampers between four steel columns. In the previous study, although the shear panel damper absorbs the seismic energy, low-cycle fatigue crack has been observed around welding of shear panel. In this study, evaluation method of low-cycle fatigue based on local strain range at crack initiation point was applied to crack in shear panel. To simplify calculation of local strain range, relationship between mean shear strain range of shear panel and local strain range at crack initiation point was developed. For quasi-static and dynamic loading condition, crack initiation life was evaluated by simplified estimation method.

    DOI: 10.11273/jssc.24.96_17

  47. Repair effect for cracked I-beam end in railway steel bridges Reviewed

    Ken Ikegashira, Yuichiro Niwa, Kentaro Matsumoto, Takeshi Hanji, Kazuo Tateishi

    Journal of Constructional Steel   Vol. 25   page: 661-666   2017.11

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    Fatigue cracks have been reported in I-beam ends of railway steel bridges, which occur at a lower end of an I-beam web. Its growth may lead to failure of the I-beam, but effective repair methods for the crack have not been established yet. This research investigated countermeasures against the crack at the I-beam end. From the result of the stress measurement, the differential settlement causes out-of-plane bending deformation of the I-beam web, which leads to a fatigue crack at the lower end of the web. The effect of several countermeasures was confirmed by analytical examinations and field trial experiments.

  48. Fatigue life prediction of corroded reinforcing steel bars Reviewed

    Takeshi Hanji, Niamatullah Ahmadzai, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the ISSS 2017     page: 478-481   2017.11

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    In this study, fatigue lives of corroded reinforcing steel bars were investigated. Several kinds of rebars consisting of different yield stress and rib shapes were used. The rebar was galvanically corroded to three levels, which are considered as a percentage of mass reduction of 5%, 10% and 15% respectively. Fatigue tests were carried out under constant stress amplitude. The test results revealed that the fatigue life of the corroded rebar decreases as the corrosion level increases. Then, 3D elasto-plastic finite element analyses were conducted with models reflecting surface profiles of the corroded rebar. The analysis results indicated that a cross section where the maximum local strain occurs corresponds to a cracking site observed in the test. Finally, the fatigue life of the corroded rebar was predicted by crack propagation calculations based on linear fracture mechanics. There are relatively good agreements between the prediction and the test results.

  49. Slip coefficient and fracture strength of high strength bolted friction joints with compact bolt spacing and edge distance Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Proceedings of the ISSS 2017     page: 223-226   2017.11

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    As for bolt spacing and edge distance of high strength bolted joints, minimum values are specified as a function of bolt diameter D, regardless of plate thickness and steel strength. That is, the minimum value is not clearly defined by mechanical performance of the joint. Moreover, there is little knowledge on the performance of the joint with the bolt spacing more compact than given in the current design specifications. This study investigates slip and fracture strength of high strength bolted joints with compact bolt spacing and edge distance. Tensile coupon tests on frictional joints with various bolt arrangement were conducted. It was not clearly observed the negative influence of compact bolt arrangement on the slip strength. The fracture strengths estimated from the cross
    sectional area where the fracture occurred and steel strength of the plate agreed with the experimental results within 10% error in all fracture modes. Parametric analyses were also conducted to investigate the influence of the bolt arrangement to the slip coefficient. It was concluded that the bolt spacing and edge distance have small influence on the slip
    coefficient.

  50. Influence of shear panel shape in multiple steel columns on low cycle fatigue Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Hiroshi Noda, Hiroki Sugiyama, Yasumasa Soga

    Proceedings of the ISSS 2017     page: 466-469   2017.11

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    Shear panel damper possess high energy absorption capacity by its hysteresis damping. However, repetition of high strain concentration around welding joint could lead to low cycle fatigue. To avoid the low cycle fatigue, estimation method should be established. So far, a prediction method of low cycle fatigue initiation life based on the local strain range has been proposed. However, the calculation of local strain usually needs much time and effort to build finite element model. In this study, the relationship between mean shear strain range and local strain range at crack initiation point was examined for various shear panel damper. From the relation, prediction equation of local strain range was established. In addition, low cycle fatigue strength curve based on mean shear strain range was developed. Comparing fatigue strength curve for several shear panel damper, fatigue crack initiation life was discussed.

  51. A simple low cycle fatigue assessment method for steel members and its application to bridge piers under earthquake Reviewed

    Tomohiro Furusaki, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Naoya Honda

    Proceedings of the ISSS 2017     page: 269-272   2017.11

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    This study newly proposed a low cycle fatigue assessment method for steel members which can predict their low cycle fatigue life from nominal strain history calculated with a beam analysis. After establishing a fatigue strength curve for base joints in steel bridge piers, seismic response analyses with beam elements were conducted to assess their low cycle fatigue performance against earthquakes. The analysis results revealed that some of the piers, even though they satisfy with the current seismic design code, have possibility to fail due to low cycle fatigue under earthquake.

  52. Evaluation of repair effect for cracked I-beam end in railway steel bridges Reviewed

    Haruya Shirai, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Masaki Iwai, Ken Ikegashira, Yuichiro Niwa

    Proceedings of the ISSS 2017     page: 404-407   2017.11

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    Fatigue cracks have been reported in I-beam ends of railway steel bridges, which occur at a lower end of an I-beam web. As a temporary measure, the crack is typically repaired with drilling holes at its tips, called a stop-hole method. In the cracked I-beam ends, however, the effect of life extension due to a stop-hole has not been clearly evaluated yet. In this study, fatigue tests of I-beams repaired with a stop-hole were conducted. And also, in order to make sure local stress distribution around the stop-hole in the test, a finite element analysis was performed. As a result, it was proven that the fatigue life of the repaired I-beam can be predicted from the local stress range at the stop-hole edge. Furthermore, several case studies on life extension of an I-beam due to the stop-hole method were performed.

  53. Fatigue crack growth prediction of welded joints in low-cycle fatigue region Reviewed

    Takeshi Hanji, Kazuo Tateishi, Nao Terao, Masaru Shimizu

    Welding in the World   Vol. 61 ( 6 ) page: 1189-1197   2017.10

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    Low-cycle fatigue is one of the failure modes in steel structures during earthquakes. With a focus on crack growth in the low-cycle fatigue region, this study developed a fatigue crack growth curve and verified its applicability to crack growth prediction in welded joints. Fatigue crack growth tests under highly plastic conditions were performed using compact tension specimens with side grooves. The results indicate that the crack growth rate in the low-cycle fatigue region correlates with the cyclic J-integral range, which can be calculated using finite element analysis. Additionally, the results for both plain steel and weld metal were distributed in the same region within a narrow band. Based on the results, a formula for the fatigue crack growth rate under large cyclic strains was proposed. Low-cycle fatigue tests were then performed on welded joints to clarify their crack growth behavior, and the crack growth observed in these tests was compared with the crack growth calculated using the proposed formula. The calculation results were found to be in relatively good agreement with the experimental results, verifying the applicability of the formula.

    DOI: 10.1007/s40194-017-0504-3

  54. Slip coefficient and strength after slip of high strength bolted friction joints with compact bolt spacing and edge distance Reviewed

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Steel Construction Engineering, JSSC   Vol. 24 ( 95 ) page: 25-40   2017.9

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    High strength bolted joints are often used in retrofitting steel bridges members, but sometimes bolts cannot be arranged by following current specification because of narrow spacing. There is no knowledge about the performance of the joints that spaced narrower than current specification. In this paper, we investigated the slip coefficient and the fracture strength of joints that bolts are spaced narrowly by tensile tests and parametric FE analysis. As the result, the slip coefficient is not influenced by the bolt spacing. The fracture strength of compact spacing bolted joints is less than standard spacing, but it can be improved by increasing the plate thickness. The fracture strength was estimated by the conventional method within 10% error.

    DOI: 10.11273/jssc.24.95_25

  55. Fatigue strength of cruciform joints and longitudinal joints with laser-arc hybrid welding Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Daisuke Uchida, Koichi Asano, Ryosuke Kimura

    The 70th Annual Assembly of International Institute of Welding     page: XIII-2698-17   2017.6

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    This study examined the fatigue strength of cruciform joints and longitudinal joints fabricated with laser-arc hybrid welding. Load-carrying and non-load-carrying cruciform welded joints with plate thicknesses of 8, 16 and 25 mm were tested under tensile cyclic loads and out-of-plane bending cyclic loads. In longitudinal joints, four-point bending fatigue tests were performed with plate girders to which flanges and a web were connected with laser-arc hybrid welding. When assembling the plate girder, tack welds were installed at the flange-to-web connection to clarify their effect on the fatigue strength of longitudinal joints. Measurements on weld toe profiles and residual stress were also conducted. The test results revealed that the fatigue strengths of hybrid welded joints are equivalent to those of arc welded joints and satisfy the fatigue design curves specified in Japanese Society of Steel Construction. In addition, the effect of plate thickness on fatigue strength was observed in hybrid welded joints as well as in arc welded joints.

  56. Influence of static strength of steels on fatigue strength improvement of welded joints by toe treatment Reviewed

    Takeshi Hanji, Kengo Anami

    Journal of Structural Engineering, JSCE   Vol. 63A   page: 646-658   2017.3

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    This study investigated the effect of the static strength of steels on fatigue strength improvement of welded joints by toe treatments. Out-of-plane gusset welded joints made of four kinds of steels, which are SM490, SBHS400, SBHS500 and SBHS700, were treated by toe grinding or peening (ultrasonic impact treatment and hammer peening) techniques and tested with a plate-bending type fatigue testing system. The test results indicated the tendency that higher improvement of fatigue strength can be achieved by the grinding and peening techniques as the static strength of steels increases.

    DOI: 10.11532/structcivil.63A.646

  57. Fatigue strength improvement on welded joints in cutout of transverse ribs in orthotropic steel bridge decks Reviewed

    Takeshi Hanji, Ayumi Itoh, Kazuo Tateishi, Masaru Shimizu

    Journal of Constructional Steel   Vol. 24   page: 657-662   2016.11

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    With a focus on a crack generated from a weld toe on a U-rib web around a cutout in orthotropic steel decks, this study performed fatigue tests with out-of-plane gusset welded joints under plate bending loads which simulates deformation in a U-rib web. The test result indicated that the conventional improvement methods, such as improving weld toe configuration and introducing compressive residual stress techniques, can increase the fatigue strength of the joint with the thin main plate as well.

  58. Fatigue crack growth prediction of welded joints of rectangular steel tube in low cycle fatigue region Reviewed

    Takeshi Hanji, Nao Terao, Kazuo Tateishi, Masaru Shimizu

    Journal of Constructional Steel   Vol. 24   page: 628-632   2016.11

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    Low cycle fatigue is one of the failure modes in steel structures during earthquakes. With a focus on crack growth in the low cycle fatigue region, the authors have developed a fatigue crack growth curve for steels. In this study, low cycle fatigue tests were performed on welded joints of a rectangular steel tube to clarify their crack growth behavior, and the crack growth observed in these tests was compared with the crack growth calculated using the proposed formula. The calculation results were found to be in relatively good agreement with the experimental results, verifying the applicability of the formula.

  59. Crack propagation life prediction for welded joints in low cycle fatigue region Reviewed

    Takeshi Hanji, Nao Terao, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the 11th Pacific Structural Steel Conference     page: 625-632   2016.10

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    In this study, focusing on crack growth in low cycle fatigue region, a fatigue life prediction method was proposed and its applicability to a crack in welded joints was verified through fatigue tests. First, a fatigue crack growth curve under large cyclic strains, which is a relationship between crack growth rate, da/dN, and cyclic J-integral range, ΔJ, was proposed for plain steel materials and weld metal. Then, crack growths in welded joints obtained in experiments were predicted by crack growth calculation with the proposed curve. Finally, the validity of the fatigue life prediction method proposed in this study was confirmed by comparing the test results and the predictions.

  60. Characteristics of fatigue crack propagation in I-beam end of railway steel bridges

    Masaki Iwai, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Shunsuke Kase, Yuichiro Niwa, Ken Ikegashira

    Proceedings of the 11th German-Japanese Bridge Symposium     page: CD-ROM   2016.8

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    Fatigue cracks have been reported in I-beam ends of railway steel bridges. The crack occurs around a rounded part between a web and a lower flange. Previous studies have revealed that out-of-plane bending deformation of a web plate due to non-uniform settlement of a support is a main trigger of the crack. On the other hand, its propagation characteristics which becomes useful information to decide a repair method have not been clarified yet. In this study, fatigue tests were performed with specimens which were cut out from I-beams in an actual railway bridge to investigate occurrence and propagation behavior of the crack. As a result, it was revealed that a crack occurs along the rounded part between the web and the lower flange and grows straight along the rounded part when cyclic load was applied just above the support. Furthermore, the result demonstrated that the crack tends to change its propagation from horizontally to downward as it approaches the sole plate end, and also that there is a possibility that this tendency was independent on loading positions.

  61. Low cycle fatigue verification of connection part in the shear panel in multiple steel columns

    Hiroshi Noda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Riku Adachi, Hiroki Sugiyama

    Proceedings of the 11th German-Japanese Bridge Symposium     page: CD-ROM   2016.8

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    Multiple steel columns consist of four steel pipes and connection beams between them. A shear panel in a connection beam is expected to absorb and disperse seismic energy by its plastic deformation. Some experiments on a shear panel have revealed that there is a possibility that low cycle fatigue crack could occur at welded joints in the panel. Therefore, it is needed to make clear conditions when low cycle fatigue cracks occur. Previous study has indicated that low cycle fatigue life of a shear panel can be assessed based on local strain amplitude at a crack initiation point. In this study, influential factors on low cycle fatigue of a shear panel were investigated through finite element analyses, and then, a simple assessment method for low cycle fatigue at a boxing weld of a scallop in a shear panel was proposed. By using the method, low cycle fatigue assessments under seismic motions were conducted. The results indicated that the method can estimate fatigue life in more conservative than the local strain based method.

  62. Fatigue strength improvement for welded joints simulating longitudinal-to-transverse rib connection in orthotropic steel deck

    Ayumi Ito, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the 11th German-Japanese Bridge Symposium     page: CD-ROM   2016.8

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    In orthotropic steel deck systems, traffic loads lead to local deformation around welded joints repeatedly, which causes fatigue cracks. Specifically, a large number of fatigue cracks have been found around a cutout between a longitudinal closed rib (U-rib) and a transverse rib web. This study focuses on a crack generated from a weld toe on a U-rib web in a cutout. This crack is mainly caused by local out-of-plane bending deformation of a U-rib, so the connection can be regarded as an out-of-plane gusset welded joint under bending loads. However, thickness of a U-rib, which is regarded as a main plate of the gusset joint, is thinner than that used in conventional joints. Therefore, there may be difference in fatigue strength improved by conventional techniques. In this study, fatigue tests were conducted with out-of-plane gusset welded joints under bending load which simulates deformation in a U-rib web. The test result indicated that conventional improvement methods, such as improving weld toe configuration and introducing compressive residual stress techniques, can increase the fatigue strength of the joint with the thin main plate as well.

  63. Effect of static strength of steel on fatigue strength improvement by introducing compressive residual stress

    Hiroki Takamatsu, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the 11th German-Japanese Bridge Symposium     page: CD-ROM   2016.8

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    Tensile residual stress existing near a weld reduces fatigue strength of welded joints. A peening technique is one of the methods to reduce tensile residual stress and introduce compressive residual stress at a cracking point, which can improve fatigue strength. In a peening method, the improvement on fatigue strength is considered to be related to the magnitude of introduced compressive residual stress. And also, it is considered that the magnitude of compressive residual stress by peening depends on the static strength of base material. Therefore, the fatigue strength of welded joints improved by peening may depend on the static strength of steel used in the joint.
    This study focuses on UIT (Ultrasonic Impact Treatment), which is one of the peening methods, and investigated the effect of static strength of steel on the fatigue strength improvement of welded joints. First of all, introduced compressive residual stress due to UIT was measured by X-ray diffraction method, and the measurements were correlated with the static strength of materials. The results indicated a tendency that higher compressive residual stress can be induced by UIT as the static strength increases. In addition, fatigue tests on out-of-plane gusset welded joints made with different grades of steels were performed to reveal the effect of the static strength on fatigue strength improvement. As a result, it was confirmed that the fatigue strength of welded joints can be improved by UIT and its effect slightly varies depending on the static strength of steel.

  64. Fatigue life extension for a crack in welded joints by CFRP repair

    Yuko Kanayama, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Mamiko Hattori, Kenyu Ushida

    Proceedings of the 11th German-Japanese Bridge Symposium     page: CD-ROM   2016.8

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    In this study, the improvement effect by Carbon-Fiber Reinforced Polymer (CFRP) repair to a crack was quantified. In order to make clear opening behavior of a crack under CFRP, tensile tests for butted steel plates which were bonded with CFRP plates were performed. The test results indicated that local peel-off around a crack needs to be introduced in a finite element model when analyzing the opening behavior of a crack under CFRP. Secondary, in order to estimate the effect of CFRP repair, stress intensity factor of a crack covered with various sizes and numbers of lamination of CFRP sheet was calculated through finite element analyses. As a result, it was indicated that length of CF sheet can affect reduction of stress intensity factor and even shorter sheet can achieve adequate improvement. In addition, fatigue tests of out-of-plane gusset welded joints repaired with CF sheets were carried out under bending load. The test results demonstrated that fatigue life of the joint is considerably improved by using CFRP.

  65. Fatigue strength of load-carrying cruciform welded joints with Laser-arc hybrid welding

    Naoya Honda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Daisuke Uchida, Koichi Asano

    Proceedings of the 11th German-Japanese Bridge Symposium     page: CD-ROM   2016.8

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    Laser-arc hybrid welding, which is combined with laser welding and arc welding, has been recently developed. Laser welding commonly requires less heat-input than ordinary arc welding, additionally it achieves deep penetration even in fast welding operation. On the other hand, an allowable root gap of a joint by the laser welding is smaller than that by arc welding due to thick weld bead. The laser-arc hybrid welding has the advantage of the laser welding and also improves the allowance of the gap, meaning that it can provide deep weld penetration, high processing speeds and wider allowance of the gap. Meanwhile, fatigue strength of the laser-arc hybrid welding has not been clarified. In addition, stress concentration and residual stress after the welding have not been deeply investigated yet. In this study, tensile and plate bending fatigue tests were carried out to examine the fatigue strength of load-carrying cruciform welded joints with the laser-arc hybrid welding. Furthermore, their residual stresses and weld toe configurations affecting the stress concentration were measured.

  66. Fatigue crack growth prediction of welded joints in low cycle fatigue region Reviewed

    Takeshi Hanji, Kazuo Tateishi, Nao Terao, Masaru Shimizu

    The 69th Annual Assembly of International Institute of Welding     page: XIII-2651-16   2016.7

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    Low cycle fatigue is one of the main failure modes in steel structures during earthquake. In this study, focusing on crack growth in low cycle fatigue region, a fatigue crack growth curve was proposed and its applicability to a crack growth prediction in welded joints was verified. Fatigue crack growth tests under large plastic condition were performed by using compact tension specimens with side grooves. The results indicated that crack growth rate in low cycle fatigue region correlates with cyclic J-integral range which is calculated by finite element analysis. Besides, the results in both plain steel material and weld metal distribute in the same region with narrow band. Based on the result, a formula of fatigue crack growth rate under large cyclic strains was proposed. Then, low cycle fatigue tests for welded joints were performed to clarify their crack growth behavior, and the crack growth obtained in the experiments were compared with the prediction based on crack growth calculation with the proposed curve. The prediction was in relatively good agreement with the experiments, which can verify the applicability of the curve.

  67. Fatigue crack growth rate of steels under large cyclic strain and its application to crack growth prediction in welded joints Reviewed

    Takeshi Hanji, Nao Terao, Kazuo Tateishi, Masaru Shimizu

    Steel Construction Engineering, JSSC   Vol. 23 ( 89 ) page: 85-95   2016.3

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    Fatigue damage due to large cyclic strains is one of the main failure modes of steel structures during earthquake. This study investigated fatigue crack propagation behavior of structural steels under large cyclic strains. Crack propagation tests for plain material and deposited metal were performed with a compact tension type specimen. Besides, as an index for crack propagation, cyclic J-integral range was defined based on fracture mechanics concept and calculated by finite element analysis. Based on the results, a fatigue crack growth curve under large cyclic strains was proposed by using the cyclic J-integral range. Then, the applicability of the proposed curve was verified through fatigue tests of corner welded joints.

    DOI: 10.11273/jssc.23.89_85

  68. Fatigue strength of welded joints with adjacent attachments and its life extension by ICR treatment Reviewed

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Shunsuke Kase, Masaki Iwai

    Journal of Structural Engineering, JSCE   Vol. 62A   page: 667-674   2016.3

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    There are some cases when weld-lines exist close to each other, for example in steel bridges, an end of a horizontal stiffener is located close to a vertical stiffener. This study performed fatigue tests and finite element analyses with plate girders where vertical and horizontal stiffeners were attached with a small distance between them. The test result revealed that fatigue cracks occurred from the end of the horizontal stiffeners and their fatigue strength slightly varied with the distance between the stiffeners. And then, the fatigue cracks were repaired by ICR treatment, and its applicability to a crack in a plate girder was investigated.

    DOI: 10.11532/structcivil.62A.667

  69. Redistribution of welding residual stress due to weld toe grinding Reviewed

    Satoshi Maeda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Journal of Constructional Steel   Vol. 23   page: 630-636   2015.11

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    Weld toe grinding is known to have relatively large variations in the improvement effects of fatigue strength. On the other hand, the residual stress distribution near the ground groove has not been revealed although it has a significant influence on the fatigue strength. In this research, X-ray stress measurements and finite element analyses were conducted in order to reveal the redistribution behavior of welding residual stress resulting from weld toe grinding. Based on the results, it was confirmed that the redistribution occurs near the ground surface and high tensile stress which can be higher than that at the original weld toe remains at the bottom of the ground groove as a result of the redistribution.

  70. Displacement based fatigue strength evaluation for root failure in fillet weld joints Reviewed

    Kazuo Tateishi, Naohiro Soda, Takeshi Hanji, Masaru Shimizu

    Proceedings of the ISSS 2015     page: 169-170   2015.11

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    This paper presents a new fatigue strength evaluation method for root failure in fillet weld joints, based on the displacement at unfused root gap. The displacement at the spot 1mm away from the weld root on unfused gap surfaces, obtained by FEA with 1mm size elements, was used as a parameter for fatigue strength evaluation. The accuracy of the method was verified with fatigue test results. A unique relationship was found between the displacements and the fatigue lives regardless of joint type and joint size and loading modes.

  71. An estimation method for weld crack initiation in weld repair under cyclic loading Reviewed

    Takeshi Hanji, Yoshio Hasegawa, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the ISSS 2015     page: 397-398   2015.11

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    This study proposed a method for estimating weld crack initiation in weld repair under cyclic loading through welding tests and thermal elasto-plastic finite element analyses. Sectional observations after the welding test revealed that the initiation of a weld crack highly depends on the magnitude of root gap opening displacement, especially in welding process. Then, through the simulation of welding under cyclic loading, this study proposed a prediction equation for the root gap opening displacement during welding. As a result of the experimental and analytical investigations, an estimation method for the crack initiation in weld repair under cyclic loading was established.

  72. A prediction method for extremely low cycle fatigue crack propagation of structural steels Reviewed

    Nao Terao, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the ISSS 2015     page: 387-388   2015.11

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    Extremely low cycle fatigue, which is caused by large cyclic deformation with small number of loading repetition, is one of the main failure modes in steel structures during earthquake. In this study, crack propagation behavior of structural steels for welded structures (not only plain material but also weld deposit) under large cyclic deformation was investigated. As a result, a prediction equation for crack propagation under large deformation was proposed based on cyclic J-integral range. Besides, the proposed equation was verified through low cycle fatigue tests of corner welded joints.

  73. Redistribution behavior of residual stress due to weld toe grinding Reviewed

    Satoshi Maeda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Proceedings of the ISSS 2015     page: 383-384   2015.11

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    Weld toe grinding is known to have relatively large variations in its improvement effects of fatigue strength. On the other hand, the residual stress distribution near the ground groove has not been revealed although it has a significant influence on the fatigue strength. In this research, X-ray stress measurements and finite element analyses were conducted in order to reveal the redistribution behavior of welding residual stress resulting from weld toe grinding.

  74. Fatigue life prediction for cracked steel plates repaired with CFRP Reviewed

    Mamiko Hattori, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    Proceedings of the ISSS 2015     page: 377-378   2015.11

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    As a new repair method, Carbon-Fiber Reinforced Polymer (CFRP) adhesive repair has been getting attention. In this study, the effect of CFRP adhesive repair for a fatigue crack in a steel plate was investigated experimentally and analytically. The fatigue tests revealed that the propagation rate of a crack repaired with CFRP was reduced comparing with that without repair. Based on the results, a fatigue life prediction method for a crack with CFRP was proposed.

  75. Analytical study on low cycle fatigue of shear panel in multiple steel columns Reviewed

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Riku Adachi

    Proceedings of the ISSS 2015     page: 253-254   2015.11

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    Multiple Steel Columns can absorb seismic energy by shear deformation of shear panel. Due to large shear deformation in the shear panel, however, the low cycle fatigue crack could occur at the welding joint of shear panel. In this study, a cyclic loading test of Multiple Steel Columns was simulated by finite element analysis. Further, prediction method for crack initiation and propagation of low cycle fatigue in a welding joint of shear panel was developed.

  76. Fatigue strength of welded joint with adjacent attachments Reviewed

    Shunsuke Kase, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    Proceedings of the ISSS 2015     page: 171-172   2015.11

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    In welded steel structures, there are some cases when weld-lines exist close to each other. As an example in steel highway bridges in Japan, a vertical stiffener is connected to a web plate close to an end of a horizontal stiffener. In this case, stress concentrations due to each joint may be superposed, and consequently, fatigue strength of the stiffeners may become lower compared with typical welded joints. In this study, fatigue tests and finite element analyses were performed on plate girders where vertical and horizontal stiffeners attached with a small gap between them. The result revealed that the stress concentration at the end of the horizontal stiffener slightly varied with the distance between the stiffeners, resulting in small difference of the fatigue strength.

  77. Displacement based fatigue strength evaluation for root failure in fillet weld joints Reviewed

    Kazuo Tateishi, Naohiro Souda, Takeshi Hanji, Masaru Shimizu

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   Vol. 71 ( 3 ) page: 315-326   2015.9

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    DOI: 10.2208/jscejseee.71.315

  78. Fatigue strength evaluation method of connection between longitudinal closed ribs and cross-beam web cutouts in orthotropic steel bridge decks Reviewed

    Takeshi Hanji, Kazuo Tateishi, Keito Kato

    Proceedings of the IABSE Conference Nara     page: CD-ROM   2015.5

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    This study investigated fatigue strength evaluation methods based on the structural hot spot stress concept, focusing on a crack at a crossing between a longitudinal closed rib and a cross-beam (transverse rib) web cutout in an orthotropic steel bridge deck. The results indicated the possibility that the fatigue strength of the connection can be evaluated with the hot spot stress range. And also, it was revealed that the hot spot stress range hardly decreases with increasing of deck plate thickness and decreasing of transverse rib distance.

  79. Crack propagation behaviour of structural steel in extremely low cycle fatigue region Reviewed

    Nao Terao, Takeshi Hanji, Kazuo Tateishi

    Proceedings of the IABSE Conference Nara     page: CD-ROM   2015.5

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    Extremely low cycle fatigue, which is caused by large cyclic deformation with small number of loading repetition, is one of the main failure modes in steel structures during earthquake. In this study, crack propagation behaviour of structural steel in extremely low cycle fatigue region was evaluated based on a non-linear fracture mechanics parameter calculated by analyses. The results demonstrated that crack propagation rate in extremely low cycle fatigue region can be estimated by using cyclic J-integral.

  80. Simple repair method for fatigue cracks in welded joints by resin injection Reviewed

    Mamiko Hattori, Takeshi Hanji, Kazuo Tateishi

    Proceedings of the IABSE Conference Nara     page: CD-ROM   2015.5

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    As a simple repair method for fatigue cracks in steel bridges, the resin injection method has been proposed. The method can decrease fatigue crack growth rate by injecting resin into a crack. In this study, the applicability of the method for cracks occurred by cyclic compressive loading was investigated by experiments and finite element analyses. The results revealed that the crack growth retardation can be expected even under the compressive loading when enough elastic modulus and infiltration of resin are achieved.

  81. Local strain based low cycle fatigue strength evaluation method for deformed bars Reviewed

    Takeshi Hanji, Kazuo Tateishi, Naoki Nagamatsu

    Journal of Structural Engineering, JSCE   Vol. 61A   page: 767-776   2015.3

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    This study proposed a local strain based fatigue strength evaluation method for deformed bars in low cycle fatigue region. Fatigue tests were conducted with the bars which have different yield strength and transverse rib shapes. The results indicated that low cycle fatigue strength of the deformed bars is almost the same regardless of the yield strength but it depends on the rib shapes. This is because strain concentration at the rib changes due to its shape. Finally, this study demonstrated that the fatigue strength of the bars with different rib shapes can be uniquely evaluated by considering local strain at the rib.

    DOI: 10.11532/structcivil.61A.767

  82. Extremely low cycle fatigue assessment of corner crack in concrete-filled steel piers based on effective notch strain approach Reviewed

    Jin-Eun Park, Takeshi Hanji, Kazuo Tateishi

    Journal of Structural Engineering, JSCE   Vol. 61A   page: 662-671   2015.3

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    This paper presents an assessment method for extremely low cycle fatigue cracks from corner joints in concrete-filled steel piers. Low cycle fatigue tests indicated that one of the main failure modes of concrete-filled steel piers are a fatigue crack from corner joints, which is caused by out-of-plane bending deformation of flange and web plates. In the previous study, authors had proposed extremely low cycle fatigue strength curves for the corner joints based on the effective notch strain approach. In this study, the proposed method was applied to the experiment of the concrete-filled piers and it is demonstrated that extremely low cycle fatigue life of the pier can be predicted by using the method.

    DOI: 10.11532/structcivil.61A.662

  83. Fatigue life extension by ICR treatment for cracked weld joints subjected to tensile or bending loads Reviewed

    Kazuo Tateishi, Takeshi Hanji, Toshiyuki Ishikawa, Masaru Shimizu

    Journal of Structural Engineering, JSCE   Vol. 61A   page: 627-637   2015.3

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    The impact crack closure retrofit treatment (called ICR treatment) is a technique to delay or arrest fatigue crack growth and enhance residual fatigue life of weld joints including a crack. The treatment is carried out with an air tool to peen plate near the crack and to produce plastic deformation of the steel surface in order to close crack opening. In this study, several fatigue tests on weld joints were conducted under tensile or bending loads in order to verify the life extension effect by ICR treatment. Besides, the effect of the loading types to the life extension was analytically investigated.

    DOI: 10.11532/structcivil.61A.627

  84. A study on fatigue life improvement of weld joints by reducing residual stress Reviewed

    Kazuo Tateishi, Takeshi Hanji

    Journal of Constructional Steel   Vol. 22   page: 795-800   2014.11

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    Reducing welding residual stress can improve fatigue strength of weld joints. Several techniques to reduce the welding residual stress have been developed and their benefits on fatigue strength have been confirmed by many fatigue tests. The test results also demonstrate that the benefit is influenced by mean stress and stress amplitude. In this study, with considering cyclic stress behavior at the cracking point, the influence of residual stress, the mean stress and the stress amplitude on fatigue strength improvement is discussed.

  85. Low cycle fatigue assessments of corner welded joints based on local strain approach Reviewed

    Takeshi Hanji, , Jin-Eun Park, Kazuo Tateishi

    International Journal of Steel Structures   Vol. 14 ( 3 ) page: 579-587   2014.10

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    Low cycle fatigue strengths of corner welded joints with single bevel groove welding were studied. Low cycle fatigue tests were performed with three types of specimens which have different sizes of weld root face. The test results indicated that the low cycle fatigue strength of the corner welded joints strongly depends on the weld root size. Then, the fatigue strength of the corner joints was evaluated based on the effective notch strain at the weld root tip which was calculated by elasto-plastic finite element analyses. A unique relationship between the effective notch strain and the fatigue life of the joint was observed regardless of the weld root size. Therefore, it was revealed that the effective notch strain approach is applicable to evaluate the low cycle fatigue strength of the corner welded joints.

    DOI: 10.1007/s13296-014-3015-8

  86. Low cycle fatigue assessment for corner joints based on effective notch strain approach Reviewed

    Takeshi Hanji, Jin-Eun Park, Kazuo Tateishi

    The 67th Annual Assembly of International Institute of Welding     page: XIII-2550-14   2014.7

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    One of the main failure modes of steel bridge piers is low cycle fatigue. In a concrete-filled steel pier with a box section, it has been reported that low cycle fatigue cracks are often initiated from longitudinal welds connecting flange and web plates (called corner joint) when it is subjected to large cyclic deformation. In this study, low cycle fatigue strengths of the corner joints were investigated. Low cycle fatigue tests were performed with corner joint specimens with different weld root sizes. Then, the fatigue strength of the corner joints was evaluated based on the effective notch strain at the root tip which was calculated by elasto-plastic finite element analyses. The results indicated a unique relationship between the effective notch strain range and the fatigue life of the joint regardless of the weld root size. Besides, the test results of the corner joints located in the same region as those of load-carrying cruciform joints. Therefore, it was demonstrated that the effective notch strain approach is applicable to evaluate the low cycle fatigue strength of welded joints regardless of the joint types.

  87. Fatigue strength of overlap joint with transverse fillet weld subjected to out-of-plane bending Reviewed

    Kazuo Tateishi, SungMin Choi, Takeshi Hanji, Daisuke Uchida, Koichi Asano, Kiyoshi Kobayashi

    Steel Construction Engineering, JSSC   Vol. 21 ( 81 ) page: 47-53   2014.3

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    Fatigue strength of overlap welded joints in which transverse fillet welds were provided was investigated under an out-of-plane bending condition. Fatigue test results demonstrated the joints were failed by weld toe cracks, and the fatigue strength was equal to that of non-load carrying cruciform joints. When intermittent fillet welds were provided, the fatigue strength was reduced, but it was properly evaluated by using the hot spot stress approach.

    DOI: 10.11273/jssc.21.81_47

  88. Fatigue strength of welded joints using steels for bridge high performance structures (SBHS) Reviewed

    Takeshi Hanji, Kazuo Tateishi, Shuichi Ono, Yoshinori Danshita

    Journal of Structural Engineering, JSCE   Vol. 60A   page: 587-595   2014.3

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    In this study, fatigue strength of welded joints using a newly developed steel called Steels for Bridge High Performance Structures (SBHS) was investigated.
    Fatigue crack propagation tests with compact tension specimens were performed to clarify fatigue crack growth characteristic of materials. Then, fatigue strengths of welded joints using SBHS were investigated. These test results revealed that the fatigue performances of welded joints using SBHS are almost the same as those of conventional structural steels.

    DOI: 10.11532/structcivil.60A.587

  89. A study on size effect of fatigue strength of out-of-plane gusset welded joint Reviewed

    Kengo Anami, Yusuke Goda, Daisuke Uchida, Shigeyuki Hirayama, Takeshi Hanji

    Journal of Structural Engineering, JSCE   Vol. 60A   page: 651-660   2014.3

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    Fatigue strength category of out-of-plane gusset welded joint was determined based on large number of previous fatigue tests and is categorized with gusset length. However, the variety of the joint size of specimens used in previous researches is very limited and the size is much smaller than the joints in large structures like steel bridges. In this study, stress analyses with out-of-plane gusset welded joint models having large variety of joint size like from small joint specimen to joint in steel bridges were conducted and size effect on fatigue strength was discussed. In addition, the fatigue strength of joint having large out-of-plane gusset is analytically evaluated.

    DOI: 10.11532/structcivil.60A.651

  90. Fatigue strength improvement of weld joints with cope hole Reviewed

    Sung-Min Choi, Kazuo Tateishi, Takeshi Hanji

    International Journal of Steel Structures   Vol. 13 ( 4 ) page: 683-690   2013.12

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    Weld joint with a cope hole has relatively low fatigue strength, since high stress concentration is generated due to local shear deformation inside the cope hole. In this study, fatigue strength improvement for the cope hole joint by burr grinding is investigated. I-section beams with cope holes, of which boxing weld toes were smoothly finished by burr grinding, were tested and analyzed in order to know the fatigue strength and the local stress behavior of the joint. Test and analysis results demonstrated that the benefit of grinding on fatigue strength improvement is relatively small when shear stress is largely applied to the cope hole detail.

    DOI: 10.1007/s13296-013-4009-7

  91. Low cycle fatigue behavior of concrete filled steel bridge piers with box section Reviewed

    Jin-Eun Park, Takeshi Hanji, Kazuo Tateishi

    Journal of Constructional Steel   Vol. 21   page: 802-808   2013.11

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    Under seismic loadings, the main failure modes of steel bridge piers are local buckling and brittle fracture triggered by low cycle fatigue. In this study, the low cycle fatigue behavior of the steel pier in which concrete is filled for retrofitting against the local buckling was investigated experimentally and analytically. The low cycle fatigue tests on concrete filled steel pier specimens revealed that fatigue cracks occurring from corner welds caused final failure of the pier. Besides, strain behaviors around the cracking sites were revealed by elasto-plastic finite element analyses.

  92. Fatigue life extension of cracked welded joints by ICR treatment under tensile loading Reviewed

    Kazuo Tateishi, Takeshi Hanji, Yoshitaka Tsuruta, Sho Sasada, Sung-Min Choi

    Proceedings of the 10th Pacific Structural Steel Conference     page: 493-498   2013.10

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    Recently, a lot of fatigue cracks have been found in steel bridges in Japan. It is therefore urgent to develop a simple repairing and retrofitting method for such fatigue cracks. A new repair method named Impact Crack Closure Retrofit treatment (ICR treatment) was developed, which induces compressive residual stress and closes a crack by hammering around the crack. In this study, improvement of the method was investigated by finite element analyses and fatigue tests. As the result of the analysis, stress intensity factor of the crack treated by the ICR decreased. The test results also showed that fatigue life was extended by the ICR treatment under cyclic tensile load.

  93. Low cycle fatigue assessment of steel bridge piers subjected to long duration ground motions Reviewed

    Takeshi Hanji, Kazuo Tateishi, Shun Ukai, Sung-Min Choi

    Proceedings of the 10th Pacific Structural Steel Conference     page: 499-504   2013.10

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    For low cycle fatigue assessment of steel members, strain behavior in the member should be accurately estimated. In this study, the strain behaviors of steel bridge piers subjected to several types of long duration ground motions were investigated, and low cycle fatigue performances of the pier were assessed by a proposed strain based method. Parametric analyses with various geometry configurations of the pier were conducted. Nominal strain amplitudes in effective failure length of the pier were obtained by nonlinear dynamic analyses, and then fatigue damage index was calculated from the strain by using nominal strain based fatigue strength curves proposed for the piers.

  94. Low cycle fatigue characteristics of steel deformed bars Reviewed

    Takeshi Hanji, Kazuo Tateishi, Kenyuu Ushida, Naoki Nagamatsu, Sung-Min Choi

    Proceedings of the 10th Pacific Structural Steel Conference     page: 505-510   2013.10

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    This study revealed low cycle fatigue strength of deformed bars and proposed a strain based fatigue strength evaluation method based on fatigue tests and FE analyses. The low cycle fatigue strength of the material of deformed bars is equivalent to that of structural steels. The low cycle fatigue strength of a deformed bar depends on the shape of ribs, but can be evaluated by using the strain amplitude at the cracking site and fatigue strength curve for the material.

  95. Fatigue strength of welded joints using steels for bridge high performance structures (SBHS) Reviewed

    Takeshi Hanji, Kazuo Tateishi, Shuichi Ono, Yoshinori Danshita, Sung-Min Choi

    Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction     page: CD-ROM   2013.9

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    In this study, the fatigue performance on the welded joints of the newly developed steel called Steels for Bridge High Performance Structures (simply called SBHS) was investigated. In order to clarify the fatigue crack growth characteristic of the SBHS, the crack propagation tests were performed with compact tension type specimens. Then, the fatigue strengths of out-of-plane gusset welded joints and non-load-carrying cruciform welded joints of the SBHS were investigated. Plate girder specimens, in which gusset plates were attached on their webs, were also fabricated with the SBHS and tested. The fatigue test results revealed that the fatigue performances of the welded joints of the SBHS are almost the same as those of the conventional steel.

  96. Local stress behavior at closed rib to crossbeam connections in orthotropic steel bridge decks Reviewed

    Keito Kato, Takeshi Hanji, Kazuo Tateishi, Sung-Min Choi, Shigeyuki Hirayama

    Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction     page: CD-ROM   2013.9

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    A large number of fatigue cracks have been reported at the connection between longitudinal closed ribs and cross-beam webs in orthotropic steel decks because of high stress concentrations due to complicated local deformations of the rib and the web. In this study, the local stress behaviors around the weld end adjacent to the cross-beam cutout were analytically investigated. Finite element analyses were conducted by using a full scale model of an actual bridge, where plenty of cracks were detected around the cross-beam cutout, to investigate the deformation modes causing the cracks. Then, the effective cutout configurations to reduce the crack-inducing local stresses were investigated by comparing the local stress in different cutout types.

  97. Fatigue strength evaluation of out-of-plane gusset weld joint

    Kengo Anami, Yusuke Goda, Daisuke Uchida, Takeshi Hanji, Shigeyuki Hirayama

    Proceedings of the 12th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2013.8

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    Fatigue strength category of out-of-plane gusset welded joint was determined based on large number of previous fatigue tests and is categorized with gusset length. However, the variety of the joint size of specimens used in previous researches is very limited and the size is much smaller than the joints in bridge structures. In this study, stress analyses with out-of-plane gusset welded joint models having large variety of joint size like from small joint specimen to joint in steel bridges were conducted, and existing fatigue test results of joint specimen and girder specimen with out-of-plane gusset weld joint were analyzed. From these analysis and survey, the following points are discussed.
    (1) Change in stress (toe stress, hot spot stress and stress at the area adjacent to the boxing weld toe) with change in joint geometry not only of base plate thickness and gusset length but also base plate width and gusset height of out-of-plane gusset weld joint; In this part, size effect in fatigue strength and in toe stress concentration factor, relationship between toe stress and hot spot stress, and nominal stress evaluation were mainly discussed.
    (2) Fatigue strength of out-of-plane gusset weld joint in bridge structures; In this part, using hot spot stress approach and existing fatigue test data, fatigue strength of large scale out-of-plane gusset weld joint was analytically evaluated.

  98. A study on weld repair of steel members under cyclic loading

    Yoshio Hasegawa, Takeshi Hanji, Kazuo Tateishi, Sung-Min Choi

    Proceedings of the 12th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2013.8

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    Since a large number of fatigue cracks have been detected in steel bridges and its number is expected to increase more and more in the future, simple repair methods are strongly required. Repair by welding will be more cost efficient and shorten work period comparing with a conventional bolted splice method, because the weld repair requires no additional members. On the other hand, the weld repair has a possibility to induce weld defects, especially when applied in service condition. Vehicle loads generate cyclic deformation of members and opening and closing behaviour of cracks. In order to employ the weld repair in actual bridges, therefore, it is necessary to make clear appropriate weld repair conditions to achieve sound weld quality under cyclic loading.
    In this study, experiments were performed to investigate weld repair quality in service condition. Specimens with a fictitious crack in their mid-width were repaired by arc-welding under cyclic loading. Several series of the tests were carried out with changing magnitude of root gap opening displacement, load frequency, welding position and groove geometry etc. After the repair welding, sections of the specimen were observed to detect weld cracks. From the observations in some specimens, the weld crack was detected in weld deposit. The experiments demonstrated that occurrence of the weld crack under the cyclic loading strongly depends on the magnitude of the root gap opening displacement and the load frequency.

  99. Residual stress distribution in welded joints by applying low-temperature transformation welding material

    Naohiro Souda, Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 12th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2013.8

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    It is well known that reduction of tensile residual stress around cracking sites is effective to improve fatigue strength of welded joints. Several methods to improve the fatigue strength, such as burr grinding, peening, and TIG-dressing techniques, have been proposed and applied to actual steel structures. Recently, a new welding material called low-temperature transformation welding material (LTT), which can induce compressive residual stress has been developed and examined about its applicability.
    In this study, thermo-elasto-plastic analyses were carried out to clarify fatigue strength improvement mechanism when applying LTT from the view point of introduction of compressive residual stress. Residual stress distribution in an out-of-plane gusset welded joint when applying LTT or a conventional welding wire was identified. In the analyses, in order to simulate actual welding procedures, heat was applied with moving its location. The analysis results indicated that compressive residual stress was introduced around a weld toe in case that LTT was used for welding. As for a weld root, it was revealed that tensile residual stress is deceased by LTT in case that LTT was used for first layer and a conventional material was the second layer.

  100. Local stress characteristics at cross-beam web cutout in closed rib orthotropic deck Reviewed

    Takeshi Hanji, Keito Kato, Kazuo Tateishi, Sung-Min Choi, Shigeyuki Hirayama

    Proceedings of the 3rd Orthotropic Bridge Conference     page: CD-ROM   2013.6

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    A large number of fatigue cracks have been reported in orthotropic steel decks, especially at the connection between longitudinal closed ribs and cross-beam webs, because of high stress concentration due to complicated local deformations of the rib and the web. In this study, the local stress characteristics around the weld end adjacent to the cross-beam cutout were analytically investigated. Finite element analyses were conducted by using a full scale model of an actual bridge, where plenty of cracks were detected around the cross-beam cutout, to figure out the deformation modes causing the cracks. Then, the effective cutout configurations to mitigate the crack-inducing deformations were investigated by comparing the local stress behaviors in different cutout types.

  101. Local stress characteristics at cross-beam web cutout in closed rib orthotropic deck Reviewed

    Takeshi Hanji, Keito Kato, Kazuo Tateishi, Sung-Min Choi, Shigeyuki Hirayama

    Journal of Structural Engineering, JSCE   Vol. 59A   page: 781-789   2013.3

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    A large number of fatigue cracks have been found in orthotropic steel decks, especially at the connection between longitudinal closed ribs and cross-beam webs. In this study, local stress characteristics around the weld end adjacent to the cross-beam cutout, which lead to fatigue damage, were analytically evaluated. Finite element analyses were first conducted by using a full scale model of the actual bridge, where plenty of cracks were detected around the cross-beam cutout, to figure out the deformation modes causing the cracks. Then, the cutout shapes which have influence on reducing the crack-inducing deformations were investigated by comparing the local stresses in different cutout types.

    DOI: 10.11532/structcivil.59A.781

  102. Fatigue strength of base joint with partial penetration weld in steel bridge brackets Reviewed

    Kazuo Tateishi, Takeshi Hanji, Sung-Min Choi, Kenshi Yoshimine, Tatsuya Takase

    Steel Construction Engineering, JSSC   Vol. 20 ( 77 ) page: 15-24   2013.3

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    Connections between a bracket flange and a main girder are fabricated by full penetration welds. Generally, the joints at the lower flange of the bracket are subjected to cyclic compressive stresses. It means that there is a possibility to change the welding method between the lower flange of the bracket and the main girder into partial joint penetration in terms of fatigue strength under compression. In this study, the fatigue strength of the base joints of the brackets was examined. The test results revealed that the joints have enough fatigue strength under the compressive stress even though partial joint penetration is applied there.

    DOI: 10.11273/jssc.20.77_15

  103. Experimental study on low cycle fatigue behavior of concrete-filled steel bridge piers Reviewed

    Jin-Eun Park, Takeshi Hanji, Kazuo Tateishi, Sung-Min Choi

    Proceedings of the 9th German-Japanese Bridge Symposium     page: CD-ROM   2012.9

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    During the Hyogo-ken Nanbu Earthquake in 1995, two types of failure modes were observed in steel bridge piers; one is a local buckling and the other is a brittle fracture triggered by a low cycle fatigue. A large number of researches on the local buckling have conducted after the earthquake and proposed several methods to prevent the local buckling of the pier, such as filling concrete in the steel pier. The concrete-filled steel pier has high deformation capacity since the internal concrete can constrain local deformation of flange and web plates, and even with an origination of the buckling, the concrete can restrain its growth. When the pier endures large cyclic plastic deformations, the low cycle fatigue will be an issue. There are, however, few researches which investigating the concrete-filled steel pier in terms of the low cycle fatigue. In this study, the low cycle fatigue behavior of the concrete-filled steel pier was experimentally investigated. The concrete-filled pier specimens were fabricated and tested under large cyclic displacement. The test results revealed the crack initiation and propagation behavior in the concrete-filled pier and the effect of the axial loading on the low cycle fatigue strength of the pier.

  104. Local strain estimation method for low- and high-cycle fatigue strength evaluation Reviewed

    Kawin Saiprasertkit, Takeshi Hanji, Chitoshi Miki

    International Journal of Fatigue   Vol. 40   page: 1-6   2012.7

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    The authors previously proposed a fatigue strength evaluation method based on the effective notch strain concept and reported that the fatigue strength of load-carrying cruciform joints can be assessed by the effective notch strain regardless of the mismatching and the incomplete penetration ratio from the low- to the high-cycle fatigue region. However, in applications to actual structures, this method has difficulty in modeling and analysis because it requires extremely fine meshing around the welds. Therefore, in this paper, an estimation method of the effective notch strain from nominal strain is proposed.

    DOI: 10.1016/j.ijfatigue.2012.01.021

  105. Fatigue strength assessment of load-carrying cruciform joints with material mismatching in low- and high-cycle fatigue regions based on the effective notch concept Reviewed

    Kawin Saiprasertkit, Takeshi Hanji, Chitoshi Miki

    International Journal of Fatigue   Vol. 40   page: 120-128   2012.7

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    This study examined the applicability of the effective notch concept to the low- and high-cycle fatigue regions for load-carrying cruciform joints. Low- and high-cycle fatigue tests were performed on specimens with various strength matching conditions and incomplete penetration ratio. Fatigue test results revealed that the effect of strength matching becomes obvious in low cycle fatigue region, while, it was negligible in high cycle fatigue region. Different failure patterns can be observed for specimen with different strength mismatching condition in the low cycle fatigue tests. Elasto-plastic finite element analyses were performed under the same conditions as the experiments. The effective notch strains were determined at the crack initiation points. A unique relationship between effective notch strain and fatigue life was obtained regardless of matching condition and incomplete penetration ratio.

    DOI: 10.1016/j.ijfatigue.2011.12.016

  106. Low and high cycle fatigue behaviour of load-carrying cruciform joints containing incomplete penetration and strength mismatch Reviewed

    Takeshi Hanji, Chitoshi Miki, Kawin Saiprasertkit

    Welding in the World   Vol. 56 ( 5/6 ) page: 133-146   2012.5

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    This study investigated the low- and high-cycle fatigue strength of load-carrying cruciform joints containing incomplete penetration and strength mismatch between base metal and weld deposit, and proposed an assessment method based on the local approach. Low- and high-cycle fatigue tests were performed on specimens with varying mismatch and sizes of incomplete penetration. The test results revealed that the crack initiation life was extremely small for this type of joint. In fractographs, dimples observed around the crack initiation site provided evidence of ductile crack propagation. Also, it was found that strength mismatch had a negligible effect on the high-cycle fatigue strength but that under-matching reduced the low-cycle fatigue region. However, a unique relationship was found between local strain around a weld root tip calculated by elasto-plastic finite element analysis and both the low- and high-cycle fatigue life of the specimen.

    DOI: 10.1007/BF03321357

  107. Low cycle fatigue design curves for base joints of steel bridge piers Reviewed

    Takeshi Hanji, Kazuo Tateishi

    Proceedings of the International Workshop on Advances in Seismic Experiments and Computations     page: 223-228   2012.3

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    In Japan, more than 5000 steel piers exist in elevated bridges in urban area, which play an important part in transportation. The Kobe Earthquake in 1995 caused enormous damage to steel bridge piers, such as collapse, buckling and brittle fracture. It has been revealed two types of main failure modes in the pier, which are local buckling and low cycle fatigue. Therefore, both local buckling and low cycle fatigue are key issues to prevent the piers from damaging and also to secure the public safety.
    In this study, we focused on the low cycle fatigue failure occurring from base joints of the pier. The low cycle fatigue assessment method based on the nominal strain approach was proposed for the base joints of the pier. The nominal strain can be simply calculated by finite element analysis with a beam element. Fatigue tests with steel pier specimens demonstrated that the proposed fatigue assessment method could provide fatigue life estimation with enough accuracy.

  108. Weld repair for fatigue cracked joints in steel bridges by low temperature transformation welding material Reviewed

    Chitoshi Miki, Takeshi Hanji, Kohei Tokunaga

    Welding in the World   Vol. 56 ( 3/4 ) page: 40-50   2012.3

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    When repairing fatigue damage by welding, the fatigue strength of cracked joints needs to be restored and also improved to prevent the reoccurrence of cracks. In this study, a new welding wire called low temperature transformation (LTT) welding wire, which enables the introduction of compressive residual stresses around a weld bead and the reduction of weld deformation, was applied to the weld repair. Its applicability was investigated by fatigue tests with compact tension specimens and a plate girder specimen. The compact tension specimens revealed that compressive residual stresses introduced by LTT welding wire have positive effects on crack initiation and propagation behaviour. The plate girder specimen indicated that the fatigue lives of cracked joints are restored and also improved by weld repair with LTT welding wire. Therefore, weld repair with LTT welding wire makes it possible to improve the fatigue strength of cracked joints.

    DOI: 10.1007/BF03321334

  109. Fatigue strength evaluation for welded joints by newly developed local stress estimation method Reviewed

    Kazuo Tateishi, Takeshi Hanji, Wataru Naruse, Isao Ito, Sung-Min Choi

    Journal of Structural Engineering, JSCE   Vol. 58A   page: 647-654   2012.3

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    This study proposed a simple method for estimating local stresses in as-welded joints and established a fatigue assessment method by using the estimated local stress. In this method, the local stress at the as-welded toe is estimated from the stress at the weld toe finished by grinding, where the stress can be measured by strain gauges. Fatigue tests and finite element analyses were conducted with out-of-plane gusset welded joints in as-welded and finished conditions. Based on the results, the local stress at the as-welded toe was correlated with the stress at the finished groove. It was concluded that the fatigue strength of the as-welded joints can be evaluated by using the local stress estimated by the proposed method.

    DOI: 10.11532/structcivil.58A.647

  110. Low- and high-cycle fatigue behavior of load-carrying cruciform joints with incomplete penetration and strength under-match Reviewed

    Takeshi Hanji, Kawin Saiprasertkit, Chitoshi Miki

    International Journal of Steel Structures   Vol. 11 ( 4 ) page: 409-425   2011.12

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    The fatigue strengths of load-carrying cruciform joints with incomplete penetration and a strength mismatch between the base metal and the deposit metal were studied. Low- and high-cycle fatigue tests were performed on specimens with five matching conditions and two sizes of incomplete penetration. The test results revealed that the failure life was governed by crack propagation in both the low-cycle and high-cycle fatigue regions, and the crack propagation paths differed according to the matching and loading conditions. In addition, the fatigue strengths of the joints were compared for the degree of strength matching and the size of incomplete penetration in the low- and high-cycle fatigue regions. It was found that the effect of strength matching on the fatigue strength is negligible in the high-cycle fatigue region, but it becomes large in the low-cycle fatigue region and significantly reduces the fatigue life of the specimen in the under-matched joints.

    DOI: 10.1007/s13296-011-4002-y

  111. Evaluation of scatter in fatigue life of welded joints by fracture mechanics Reviewed

    Kazuo Tateishi, Moritaka Yoshida, Takeshi Hanji

    Journal of Constructional Steel   Vol. 19   page: 351-354   2011.11

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    In this study, an evaluation method for the scatter in fatigue life of welded joints was developed by applying linear elastic fracture mechanics and Monte-Carlo simulation technique. Fatigue crack propagation analysis, of which initial conditions were determined by the Monte-Carlo simulation, was performed on non-load-carrying cruciform welded joints and out-of-plane gusset welded joints. It is demonstrated that the estimated fatigue life by the proposed method distributes around the similar region as the fatigue test data. Consequently, the results indicate the possibility that the fatigue strength curves of welded joints can be established by incorporating a small number of fatigue test data with the proposed method.

  112. Improvement methods in extremely low cycle fatigue strength of base joints in steel bridge bents by weld toe treatment Reviewed

    Takeshi Hanji, Naoki Nagamatsu, Kazuo Tateishi

    Journal of Constructional Steel   Vol. 19   page: 355-360   2011.11

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    This study investigated the effect of extremely low cycle fatigue strength improvements on steel bridge piers by weld toe grinding. Low cycle fatigue tests on steel pier specimen of which base joints were finished by grinding were performed. Test results revealed that the fatigue strength of the pier was improved by the toe grinding in comparison to those in as-welded condition. Local strains around finished weld toe were analyzed by finite element analysis. It was confirmed that it is possible to estimate the extremely low cycle fatigue life by using local strain and suggested fatigue strength curves.

  113. Retardation of fatigue crack propagation in welded joints under plate bending by hardening material injection Reviewed

    Kazuo Tateishi, Ryuichi Tsuboi, Takeshi Hanji

    Proceedings of the 6th International Symposium on Steel Structures     page: 352-357   2011.11

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    The number of fatigue cracks at in steel bridges is increasing, while it is difficult to repair all cracks just after detecting them. In this study, a simple repair method for cracks in steel bridges was proposed. This method can retard or arrest the crack growth by injecting hardening material into the crack to restrain its closure. To verify the applicability of the proposed method, fatigue tests under plate bending were conducted on out-of-plane gusset welded joints repaired by the hardening material injection. It was indicated that the effect of the crack growth retardation depends on when injecting the hardening material into the crack, and that the proposed method can extend the fatigue life regardless of the stress ratio.

  114. Fatigue strength evaluation method for welded joints by new local stress concept Reviewed

    Kazuo Tateishi, Wataru Naruse, Takeshi Hanji, Isao Itoh

    Proceedings of the International Conference on Advanced Technology in Experimental Mechanics' 11     page: CD-ROM   2011.9

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    Local stress approach has been proposed as the fatigue strength evaluation method of welded joints without any classifications by the joint types and verified in the past studies. Generally, since it is difficult to directly measure the local stresses at the crack initiation point, ex. weld toe, the stress analysis helps us to estimate them, which requires establishing a model with weld toe geometry in fine mesh and great amounts of time. Thus, this study proposed the simple method for estimating the local stress in as-welded joints. In this method, the local stress at the as-welded toe is estimated from the stress at the toe finished by the grinding technique, where the strain gauge measurement is applicable. Fatigue tests and finite element analyses were conducted with out-of-plane gusset welded joints of as-welded and finished condition, respectively. Based on the results, the correlation of the local stress in the as-welded and finished joints was established. Consequently, it was demonstrated that the fatigue strength of the as-welded joints can be evaluated by using the local stress estimated by the proposed method.

  115. Low cycle fatigue strength of under-matched welded joint with incomplete penetration Reviewed

    Takeshi Hanji, Kawin Saiprasertkit, Chitoshi Miki

    Quarterly Journal of the Japan Welding Society   Vol. 29 ( 3 ) page: 162-173   2011.8

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    Low cycle fatigue strengths of load-carrying cruciform joints with incomplete penetration and strength under-match between base metal and deposit metal were studied. Fatigue tests were performed on specimens with five matching conditions and two sizes of incomplete penetration. Test results revealed that failure life was governed by crack propagation, and that crack propagation paths differed by matching and loading conditions. Also, fatigue strength of the joints was compared regarding the degree of strength matching and size of incomplete penetration. It was found that the effect of the strength matching on the fatigue strength becomes large in low cycle fatigue region by significantly reducing fatigue life of the specimen in the case of under-match joints.

    DOI: 10.2207/qjjws.29.162

  116. Improvement in extremely low cycle fatigue strength of steel bridge piers by weld toe grinding

    Naoki Nagamatsu, Takeshi Hanji, Kazuo Tateishi

    Proceedings of the 11th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2011.8

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    This study investigated the effect of the extremely low cycle fatigue strength improvement on steel pier by weld toe grinding. Low cycle fatigue tests on the steel pier specimens, of which base joints were ground smoothly, were performed, and their results were compared with those of the specimens under as-welded condition. It was revealed that the burr grinding is applicable to increase the fatigue strength in extremely low cycle fatigue region. Local strain around finished weld toe was analyzed by finite element analysis. It was confirmed that it is possible to estimate the extremely low cycle fatigue life by using local strain at a crack initiation point and proposed fatigue strength curves. Moreover appropriate grinding areas were considered by the analysis.

  117. Evaluation of scatter in fatigue life of welded joints by fracture mechanics

    Kazuo Tateishi, Moritaka Yoshida, Takeshi Hanji

    Proceedings of the 11th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2011.8

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    In this study, an evaluation method for the scatter in the fatigue life of the welded joints was developed with employing LEFM and Monte-Carlo simulation technique. Fatigue crack propagation analysis, of which initial conditions were determined by the Monte-Carlo simulation, was performed on non-load-carrying cruciform welded joints and out-of-plane gusset welded joints. It was demonstrated that the estimated fatigue life by the proposed method distributes around the similar region as the fatigue test data. Consequently, the results indicate the possibility that the fatigue strength curves of welded joints can be established by incorporating a small number of fatigue test data with the proposed method.

  118. Local stress based fatigue assessment for out-of-plane gusset welded joints

    Sho Sasada, Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 11th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2011.8

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    Local stress approach has been proposed and verified in past studies as the fatigue strength evaluation method of welded joints without any classifications by the joint types. Even though the local stress approach is valid for assessing the fatigue life of the joints, it is difficult to measure the local stresses at the as-welded toe directly. The stress analysis makes it possible to estimate the local stresses, which requires establishing a model with weld toe geometry in fine mesh. This study proposed the simple estimation method for the local stress in as-welded joints. In this method, the local stress at as-welded toe is estimated from the stress measured at the toe finished by the grinding technique. Fatigue tests and finite element analyses were conducted with out-of-plane gusset welded joints in as-welded and finished condition, respectively. Based on the analysis results, a correlation between the stress at the finished groove and the local stress at the as-welded toe was established. Then, fatigue test results verified that the fatigue strength of out-of-plane welded joints can be uniformly evaluated by using proposed local stress based fatigue assessment method.

  119. Fatigue strength of base joints of outrigger bracket in steel bridges

    Shun Ukai, Kazuo Tateishi, Takeshi Hanji, Kenshi Yoshimine

    Proceedings of the 11th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2011.8

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    In present, the upper and lower flanges of outrigger bracket are attached to main girder by using full penetration welding. However, the full penetration weld of lower flange might be mainly subjected compressive stress by live load, and also the generated stress level is relatively low. This study investigated the possibility to change the full penetration weld joint of lower flange to partial penetration weld joint considering fatigue strength. In this study, fatigue test was carried out on partial penetration welded cruciform joint under compressive cyclic load which simulates new welding joint of the lower flange. Moreover, finite element analysis was performed to identify the stress distribution around the welded joint outrigger bracket. The results revealed the possibility to change the full penetration welds of lower flange to partial penetration welds.

  120. Fatigue crack propagation at attachment welded joint

    Kengo Anami, Takayuki Arai, Akira Tanikaga, Yusuke Kobayashi, Daisuke Uchida, Takeshi Hanji, Shigeyuki Hirayama

    Proceedings of the 11th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2011.8

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    In this study, the validity of the assumption made for the crack propagation analysis, that fatigue crack propagates in the plane perpendicular to the loading direction, was discussed. The comparison of stress intensity factor obtained by the conventional method and analytical codes were made. In addition, fatigue tests with out-of-plane gusset welded joints were carried out and the front profile of fatigue crack originated in out-of-plane gusset welded joint was closely observed.

  121. Fatigue crack initiation point of load carrying cruciform joints in low cycle fatigue region Reviewed

    Takeshi Hanji, Kawin Saiprasertkit, Chitoshi Miki

    The 64th Annual Assembly of International Institute of Welding     page: XIII-2385-11   2011.7

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    Load carrying cruciform joints with incomplete penetration have two fatigue cracking points which are the weld root and toe. The crack initiation point in high cycle fatigue region depends on only weld leg size and incomplete penetration ratio, while the strength mis-matching between the base and deposit metal becomes important when considering it in low cycle fatigue region. Elasto-plastic analysis was performed on load carrying cruciform joints regarding the size of weld leg and incomplete penetration, and strength matching. The effective notch was assigned at the weld root and toe, and the strains around both notches were compared. It was demonstrated that the cracking points estimated from the analysis agreed with the experimental results.

  122. Fatigue strength assessment of load carrying cruciform joints in low and high cycle fatigue region based on effective notch concept Reviewed

    Kawin Saiprasertkit, Takeshi Hanji, Chitoshi Miki

    The 64th Annual Assembly of International Institute of Welding     page: XIII-2384-11   2011.7

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    This study newly defined effective notch strain and examined its applicability in elastic and elasto-plastic condition for load carrying cruciform welded joints. Low and high cycle fatigue tests were performed on specimens with different strength matching conditions and incomplete penetration sizes. To calculate the effective notch strain of the specimen, elasto-plastic finite element analyses were performed under the same condition as experiments. The unique relation between the effective notch strain and fatigue life can be obtained regardless of the matching condition and incomplete penetration size. Furthermore, the simple method for estimating effective notch strain was proposed and verified by the experiments.

  123. Experimental study of load-carrying cruciform joints containing incomplete penetration and strength under-matching in low and high cycle fatigue regions Reviewed

    Kawin Saiprasertkit, Takeshi Hanji, Chitoshi Miki

    Proceedings of the 12th East Asia-Pacific Conference on Structural Engineering and Construction     page: CD-ROM   2011.1

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    Fatigue behaviors of load-carrying cruciform joints containing incomplete penetration and strength under-matching between base metal and weld deposit were studied. Low and high cycle fatigue tests were performed on specimens with five matching conditions and two sizes of incomplete penetration. Observation of the specimens revealed that crack propagation paths differ by low and high cycle loading conditions and that failure life was dominated by crack propagation. Besides, it was found that the effect of the strength under matching on the fatigue strength becomes large in low cycle fatigue region by significantly reducing fatigue life of the specimen. Moreover, local strain obtained from analysis model can be governing parameter to fatigue life of specimens.

  124. Seismic retrofit of existing highway steel bridges using devices considering driving safety of vehicles Reviewed

    Khac Thanh Nguyen, Takeshi Hanji, Chitoshi Miki

    Proceedings of the 3rd ASIA Conference on Earthquake Engineering     page: CD-ROM   2010.12

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    Previous research suggested that driver's reaction during earthquake, which is responsible for driving safety, is related to velocity response of bridge deck. To reduce the velocity response of the deck, conventional devices like rubber bearings, base isolators and dampers system are employed. Analytical results reveals that rubber bearings, while more commonly used than dampers, cannot not reduce velocity response even though they can be effective in controlling strain response of steel bents.

  125. Seismic resistance evaluation of load carrying cruciform welded joints with material matching and incomplete penetration Reviewed

    Kawin Saiprasertkit, Takeshi Hanji, Chitoshi Miki

    Proceedings of the 3rd ASIA Conference on Earthquake Engineering     page: CD-ROM   2010.12

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    This study investigates the applicability of local approach to assess the fatigue strength of load carrying cruciform joints containing incomplete penetration and strength mismatching. Low and high cycle fatigue tests were conducted. Test results indicate that the effect of the strength mismatch on the fatigue strength is negligibly small in high cycle fatigue region but becomes large in low cycle fatigue region. Elasto-plastic FE analysis was performed, where the concept of effective notch was assigned at weld root tip. Different types of notch shapes were investigated. It is clear that local strain obtained from FE model can be used to arrange fatigue strength of load carrying cruciform joints. A unique curve can be established from low to high cycle fatigue regions.

  126. Weld repair for fatigue cracked joints in steel bridges by low temperature transformation welding material Reviewed

    Chitoshi Miki, Kohei Tokunaga, Takeshi Hanji

    Doboku Gakkai Ronbunshuu A   Vol. 66 ( 4 ) page: 836-849   2010.12

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    The weld repair requires no additional member such as splice plates, therefore it will be more cost efficient and shorten the work period comparing with the conventional bolted repair method. However, the weld repair has possibility to introduce weld defects or residual deformation which may reduce the fatigue strength of the repaired joints. Besides, even though fatigue cracked joints are restored to the initial condition with sound weld repairs, the fatigue crack will reoccur in the repaired joint, because the fatigue strength of cracked joints is low in most of the cases.
    In this study, a new welding material named low temperature transformation (LTT) welding material, which enables to introduce compressive residual stress in the vicinity of the weld bead and reduce weld deformation, was applied to the weld repair. The applicability of the LTT welding material to the weld repair was investigated by the fatigue tests with compact tension specimens and a steel girder specimen.

    DOI: 10.2208/jsceja.66.836

  127. Low and high cycle fatigue behavior of load-carrying cruciform welded joints containing incomplete penetration and strength mismatch Reviewed

    Takeshi Hanji, Chitoshi Miki, Kawin Saiprasertkit

    The 63rd Annual Assembly of International Institute of Welding     page: XIII-2330-10   2010.7

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    This study investigated effects of incomplete penetration and strength mismatch between base metal and weld deposit on fatigue strength of load-carrying cruciform welded joints. Low and high cycle fatigue tests were performed on specimens with changing matching conditions and sizes of in-complete penetration. Test results revealed that fatigue life was dominated by crack propagation, and that crack propagation directions vary according to strength matching and loading conditions. In fractographs, dimples were observed around the crack initiation point which produces an evidence of ductile crack propagation. Also, it was found that the effect of the strength under matching, in which yield strength of weld deposit is lower than that of base metal, on the fatigue strength is negligibly small in high cycle fatigue region but becomes large in low cycle fatigue region by significantly reducing fatigue life of the joints.

  128. Development of new database of fatigue damage and repairing cases by using editor-friendly platform Reviewed

    Chitoshi Miki, Keigo Suzuki, Kiyoshi Ono, Takeshi Hanji

    The 63rd Annual Assembly of International Institute of Welding     page: XIII-2332-10   2010.7

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    This study presents a newly developed web database for fatigue damage and repairing cases. Authors use a new platform “PukiWiki" for the web data base instead of html documents. The new platform includes two advantages. One is the editing language, the simple structure of which enhances easy updating; hence, it is possible for the researchers and engineers who are unfamiliar with editing a web page to use it. Another advantage is multi-editor system. Authorized researchers and engineers can edit and update the web at any time from anywhere; that is, we can skip the process of collecting, editing and updating information by a web administrator. It means the platform enables to less laborious editing and quick updating. We expect to enlarge new information on the web; also, expand professional judgment and outlooks to the world from the new database.

  129. Weld repair for fatigue cracked joints in steel bridges by applying low temperature transformation welding wire Reviewed

    Chitoshi Miki, Takeshi Hanji, Kohei Tokunaga

    The 63rd Annual Assembly of International Institute of Welding     page: XIII-2331-10   2010.7

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    The weld repair requires no additional member such as splice plates, therefore it will be more cost efficient and shorten the work period comparing with the conventional bolted splice method. However, the weld repair has possibility to induce weld defects or residual deformation which may reduce the fatigue strength of the repaired joints. Besides, even though fatigue cracked joints are restored to the initial condition with sound weld repairs, cracks will reoccur in the repaired part, because the fatigue strength of cracked joints is originally low in most of the cases. In this study, a new welding wire named low temperature transformation (LTT) welding wire, which enables to introduce compressive residual stress in the vicinity of the weld bead and reduce weld deformation, was applied to the weld repair. The applicability of LTT welding wire to the weld repair was investigated by the fatigue tests with compact tension specimens and a plate girder specimen.

  130. Radiation characteristics of ultrasonic tip echo and its application to detect fatigue crack closure in welding residual stress fields Reviewed

    Chitoshi Miki, Ryohei Onishi, Takumi Kubota, Takeshi Hanji

    Doboku Gakkai Ronbunshuu A   Vol. 66 ( 2 ) page: 219-228   2010.4

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    Ultrasonic tip echo is scattered wave which radiates all direction from the sharp tip of reflection source such as fatigue cracks. Tip echo has been utilized for sizing defects as so-called “tip echo method" and also may apply to identify fatigue cracks from other defects. In this study, radiation characteristics of the tip echo were experimentally examined. A linear phased array ultrasonic testing system was applied to send and receive ultrasonic waves in various directions. The experimental results demonstrated the relationship between incident wave directions and directivity of the tip echo. Besides, the tip echo method was applied to a fatigue crack in a welded steel plate, and damping of echoes due to fatigue crack closure was indicated.

    DOI: 10.2208/jsceja.66.219

  131. Cause identification of fatigue damage in steel bridge by applying Wireless Sensor Network Reviewed

    Chitoshi Miki, Hiroshi Yamaguchi, Takeshi Hanji, Atsushi Tanabe

    Journal of Structural Engineering, JSCE   Vol. 56A   page: 671-679   2010.3

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    In order to guess the behavior of member causing fatigue damage at joint part in a railway truss bridge, experimental measurements in actual bridge was conducted by using wireless acceleration sensor devices and strain gauge. The grobal behavior of member, causing the fatigue damage when train passed through the target panel point, was verified based on the local strain data from strain gauges and acceleration data from wireless sensors. Finally, from the measurements, a countermeasure for the prospective fatigue crack was suggested.

    DOI: 10.11532/structcivil.56A.671

  132. Fatigue behavior of load carrying cruciform joints with weld defect under cyclic plastic strain Reviewed

    Takeshi Hanji, Kawin Saiprasertkit, Chitoshi Miki

    Proceedings of the 7th International Conference on Urban Earthquake Engineering     page: 1997-2004   2010.3

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    In this study, fatigue behavior of load-carrying cruciform joints with incomplete penetrations under cyclic plastic strains, corresponding to the fatigue life is less than hundreds cycles, was experimentally investigated. In all specimens, fatigue cracks initiated from the weld root and propagated into the weld deposit. Crack initiation life was rather small compared with crack propagation life. This means that the propagation life is dominant in the fatigue life of the joints. Fracture surfaces under cyclic plastic strains contained dimples, which can produce an evidence of ductile crack propagation.

  133. A proposal on low cycle fatigue strength curve for base joints of steel bridge pier Reviewed

    Takeshi Hanji, Kazuo Tateishi

    Steel Construction Engineering, JSSC   Vol. 16 ( 64 ) page: 21-30   2009.12

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    Steel bridge piers are often used for elevated highway bridges. The Hanshin-Awaji earthquake in 1995 revealed two types of failure mode in the pier, which are local buckling and low cycle fatigue. However, researches on low cycle fatigue of civil structures are limited, and design methods have not been established yet.
    In this study, low cycle fatigue strength curves for base joints of the steel pier based on nominal strain, which can be calculated by finite element analysis with a beam element, were proposed. Fatigue tests with steel pier specimens demonstrated that the proposed fatigue strength curves could provide fatigue life estimation with enough accuracy.

    DOI: 10.11273/jssc.16.64_21

  134. Improvement of extremely low cycle fatigue strength of welded joints by toe finishing Reviewed

    Kazuo Tateishi, Takeshi Hanji, Shuji Hanibuchi

    Welding in the World, IIW   Vol. 53   page: 238-245   2009.10

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    The improvement of extremely low cycle fatigue strength of welded joints by TIG dressing and burr grinding was investigated. The weld toes of T-shape welded joints were improved by TIG dressing or burr grinding and tested under displacement control conditions. The crack initiation life of finished specimens was at least threefold longer than that of as-welded specimens. There was no clear difference in improvement between TIG dressing and burr grinding. We also analysed the local strain around the cracking point by finite element analysis, and performed local strain-based fatigue assessment. The results indicated that extremely low cycle fatigue strength of the joints improved by TIG dressing and burr grinding can be assessed by evaluating the local strain and referring to the extremely low cycle fatigue strength curve.

    DOI: 10.1007/BF03321135

  135. A simulation on fatigue crack propagation in welded joints Reviewed

    Takeshi Hanji, Kazuo Tateishi, Keisuke Tsuchiya

    Proceedings of the 10th International Conference on Structural Safety and Reliability     page: 3377-3381   2009.9

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    Fatigue crack propagation simulations on T-shape welded joints were carried out. Main plate of the joint was supported at ends and tensile and bending loads were applied to an attached rib. An initial crack of 0.5 mm in length was given at weld toe on the main plate. Five kinds of stresses, i.e. nominal bending stress, membrane stress and average shear stress in the main plate, nominal bending stress and membrane stress in the attached rib, were picked up as parameters. With changing these parameters, the crack propagation simulation was performed. Simulation results demonstrated that the crack direction at the beginning was influenced by the parameters, particularly the average shear stress in the main plate. These results were supported by fatigue test results conducted under the same conditions as the simulation. Finally, the relationship of the average shear stress and the crack direction at the beginning were presented.

  136. Fatigue strength of load carrying cruciform joints in beam to column connection of steel bridge piers Reviewed

    Kawin Saiprasertkit , Chitoshi Miki, Takeshi Hanji

    Proceedings of the 11th International Summer Symposium, JSCE     page: 5-8   2009.9

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    The purpose of this study is to evaluate the fatigue strength of load carrying cruciform welded joints which contain incomplete penetration in both high and low cycle fatigue regions. Cyclic loading experiment was carried out in this study, and failure surfaces were investigated in order to verify the crack propagation and initiation point.

  137. Fatigue strength of load-carrying cruciform joints with incomplete penetration in low- and high-cycle fatigue regions

    Takeshi Hanji, Chitoshi Miki, Kawin Saiprasertkit

    Proceedings of the 10th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2009.8

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    In this paper, fatigue strength of welded joints with incomplete penetrations was experimentally investigated overall from low-cycle to high-cycle fatigue regions, corresponding to the fatigue life is from tens cycles to millions cycles. Fatigue tests on load-carrying cruciform joints containing root discontinuities were carried out. In all specimens, fatigue cracks initiated from the weld root and propagated into the weld metal. Fracture surfaces of the specimen were observed in order to verify the crack initiation point and propagation behavior.

  138. Study on structural behavior causing fatigue damage in steel bridge by applying wireless sensor network

    Hiroshi Yamaguchi, Chitoshi Miki, Atsushi Tanabe, Takeshi Hanji

    Proceedings of the 10th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2009.8

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    The purpose of this research is to guess the behavior of member causing fatigue damage at joint part in Railway Truss Bridge using wireless acceleration sensor devices and local strain measurement, and to suggest the countermeasure for the prospective fatigue crack. In this paper, the experimental measurement in actual bridge was conducted, then the behavior of member causing the fatigue damage when train passed through the target panel point was verified by the local strain data from strain gauge and acceleration data from wireless sensor. Finally, from the measurement results, the countermeasure is suggested.

  139. Extremely low cycle fatigue strength of finished welded joint

    Kazuo Tateishi, Takeshi Hanji, Shuji Hanibuchi

    Proceedings of the 10th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2009.8

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  140. Fatigue crack propagation path in T-shape welded joints subjected to plate bending

    Kazuo Tateishi, Keisuke Tsuchiya, Takeshi Hanji

    Proceedings of the 10th Japan-Korea Joint Symposium on Steel Bridges     page: CD-ROM   2009.8

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    In this paper, fatigue crack propagation analysis on T-shape welded joints under out-of-plane plate bending was carried out. Main plate of the joint was supported at the ends, and tensile and bending loads were applied to an attached rib. We picked up five kinds of stresses as parameters, i.e. nominal bending stress, membrane stress and average shear stress in the main plate and nominal bending stress and membrane stress in the attached rib. We performed the analysis with changing these parameters and investigated the crack propagation path. The analysis results indicated that the crack angle at the beginning was influenced by these parameters, particularly the average shear stress in the main plate. These results were verified by fatigue tests conducted in the same conditions as the analysis. Finally, we presented the correlation between the average shear stress in the main plate and the crack angle at the beginning.

  141. Radiation characteristics of ultrasonic tip echo from fatigue cracks Reviewed

    Chitoshi Miki, Ryohei Onishi, Takumi Kubota, Takeshi Hanji

    The 62nd Annual Assembly of International Institute of Welding     page: XIII-2285-09   2009.7

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    Tip echo is scattered wave which radiates all direction from the sharp tip of reflection source such as fatigue cracks. Tip echo has been utilized for sizing defects as tip echo method and also may apply to identify fatigue cracks from other defects. The radiation characteristics of tip echo were examined experimentally and the relationship between incident wave directions and directivity of echo and dumping of echo due to fatigue crack closure were shown. The steering and focusing functions of linear phased array ultrasonic testing system was applied to send waves to the tip of crack with various angles and to receive echo waves from various directions. Then, the tip echo method was applied to a crack to grasp crack tip opening and closing behaviour in the residual stress field.

  142. A case study of performance based design on low cycle fatigue improvement

    Kazuo Tateishi, Takeshi Hanji, Shuji Hanibuchi

    Proceedings of the 5th International Symposium on Steel Structures     page: 201-205   2009.3

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    In this study, we analyzed the local strain around the cracking point of the finished joint and the as-welded joint by FEA, and demonstrated that the local strain could be affected by the toe geometry parameters, such as radius, depth of the groove, and the main plate thickness. Then, we presented an example way to determine the desirable shape of the finished zone for satisfying the fatigue performance requirement of the welded joint.

  143. A simulation of fatigue crack propagation in steel girder bridges Reviewed

    Kazuo Tateishi, Akira Tanikaga, Takeshi Hanji

    Journal of Constructional Steel   Vol. 16   page: 453-458   2008.11

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    In this study, fatigue crack propagation simulations in steel girder bridges were conducted by ZENCRACK, which is a commercial software for three dimensional crack propagation analysis based on fracture mechanics. A steel bridge with three I-girders was employed and modeled in detail. It was confirmed that the crack propagation simulation can be a beneficial method to investigate the changes on structural behavior of the bridge due to crack propagation and identify the serious cracks for the bridge.

  144. Extremely low cycle fatigue assessment method for un-stiffened steel pier with box section

    Kazuo Tateishi, Tao Chen, Takeshi Hanji

    Proceedings of the 11th East Asia-Pacific Conference on Structural Engineering and Construction     page: CD-ROM   2008.11

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    In the Great Hanshin Awaji Earthquake (1995), steel bridge piers were damaged by extremely low cycle fatigue, which has raised concerns about the seismic performance of the piers. However, researches on extremely low cycle fatigue strength of structural steel members have been limited and no design guidelines have been established for bridge structures. The authors have already conducted a series of researches on extremely low cycle fatigue strength of structural steel members and proposed a simple assessment method for extremely low cycle fatigue strength of the steel bridge piers. In this study, steel pier specimens were fabricated and tested under large cyclic deformation, and the proposed assessment method was verified by the test results.

  145. Improvement of extremely low cycle fatigue strength of welded joints

    Shuji Hanibuchi, Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 11th East Asia-Pacific Conference on Structural Engineering and Construction     page: CD-ROM   2008.11

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    In this study, the improvement of extremely low cycle fatigue strength by toe finishing was investigated. T-shape welded joints, which are in as-welded, TIG dressed or burr ground condition, were tested under displacement control conditions. The test results indicated that crack initiation lives of finished specimens were much longer than those of as-welded specimens. Between TIG dressing and burr grinding, no clear difference on improvement was observed. We also performed elasto-plastic finite element analyses to calculate local strain around the cracking point, and assessed the fatigue strength of the finished specimen based on the local strain. The results demonstrated that the fatigue strength of TIG dressed and burr ground joints can be reasonably assessed using the local strain at the cracking point and the extremely low cycle fatigue strength curves.

  146. A study on fatigue crack propagation path in T shape welded joint

    Keisuke Tsuchiya, Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 11th East Asia-Pacific Conference on Structural Engineering and Construction     page: CD-ROM   2008.11

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    In this study, fatigue crack propagation analyses on T-shape welded joints subjected to plate bending were carried out. We picked up five kinds of stresses as parameters, i.e. nominal bending stress, membrane stress and average shear stress in the main plate, nominal bending stress and membrane stress in the attached rib. We analyzed the crack propagation path with changing these parameters. Analysis results indicated that the crack angle at the beginning was influenced by these parameters, especially the average shear stress in the main plate. These results were supported by fatigue test results conducted on T-shape welded joints with the same conditions used in the analysis. Finally, we presented the relationship of the average shear stress and the crack angle at the beginning.

  147. Improvement of extremely low cycle fatigue strength of welded joints by toe finishing Reviewed

    Kazuo Tateishi, Shuji Hanibuchi, Takeshi Hanji

    The 61st Annual Assembly of International Institute of Welding     page: XIII-2232-08   2008.7

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    The improvement of extremely low cycle fatigue strength of welded joints by TIG dressing and burr grinding was investigated. The weld toes of T-shape welded joints were improved by TIG dressing or burr grinding and tested under displacement control conditions. The crack initiation life of finished specimens was at least threefold longer than that of as-welded specimens. There was no clear difference in improvement between TIG dressing and burr grinding. We also analysed the local strain around the cracking point by finite element analysis, and performed local strain-based fatigue assessment. The results indicated that extremely low cycle fatigue strength of the joints improved by TIG dressing and burr grinding can be assessed by evaluating the local strain and referring to the extremely low cycle fatigue strength curve.

  148. Extremely low cycle fatigue assessment method for un-stiffened cantilever steel columns Reviewed

    Kazuo Tateishi, Tao Chen, Takeshi Hanji

    Doboku Gakkai Ronbunshuu A   Vol. 64 ( 2 ) page: 288-296   2008.4

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    This paper presents the results of un-stiffened cantilever column subjected to incremental or constant amplitude cyclic loading. The objectives of this study are to investigate the extremely low cycle fatigue life of the column and verify the proposed strain based approach. During the test, fatigue cracks initiated from the weld toe at the corner and propagated along the weld toe. Finally, the column ruptured without a local buckling. The failure of low cycle fatigue induced by large cyclic deformation has been elucidated. In a further step, the crack initiation life was estimated based on the local strain by proposed simple approach. It is indicated that correlation between the test result and the estimated life was good enough.

    DOI: 10.2208/jsceja.64.288

  149. Analytical investigation on fatigue crack propagation in welded joints Reviewed

    Kazuo Tateishi, Takeshi Hanji

    Journal of Constructional Steel   Vol. 15   page: 321-326   2007.11

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    Recently, a lot of fatigue cracks have occurred at some members in steel bridges. Besides, steel bridge have a possibility that the cracks would be initiated in future resulting the increase of their ages. In order to repair and retrofit the cracks properly, it is important to predict how they will propagate and to specify why they were initiated. In this paper, fatigue crack propagation analysis of welded joint was carried out with ZENCRACK software, and some factors which can be influence on the crack propagation process were investigated.

  150. Review of recent bridge asset management systems Reviewed

    Takeshi Hanji, Kazuo Tateishi

    Proceedings of International Symposium on EcoTopia Science 2007     page: 1322-1326   2007.11

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    A number of transportation agencies throughout the world have adopted and implemented the bridge management system with advanced asset management decision-making capabilities. However, there are still significant room for improvement in the information and data upon which the bridge management systems are based, and on the results and decision-making that occurs based on the output of these systems. In order to address some of gaps in knowledge, the Federal Highway Administration (FHWA) of the U.S. Department of Transportation is initiating a Long-Term Bridge Performance (LTBP) program in 2006. In this paper, we will introduce the recent bridge management systems and the LTBP program in the States.

  151. Extremely low cycle fatigue test on un-stiffened steel pier with thick-walled box section

    Takeshi Hanji, Kazuo Tateishi, Tao Chen

    Proceedings of the 9th Korea-Japan Joint Seminar on Steel Bridges     page: 227-233   2007.8

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    Several steel piers suffered low cycle fatigue damage in the Great Hanshin Earthquake (1995), which raises concerns about their performance in future earthquakes. However, researches on the low cycle fatigue of civil structures in extremely large strain region, corresponding to a strain magnitude of more than 10% and a fatigue life of less than ten cycles, are limited and design guidelines have not been established. In order to provide the benchmark data for extremely low cycle fatigue assessment, thick-walled steel piers with box section were fabricated and subjected to incremental or constant amplitude cyclic loading. During the test, fatigue cracks were initiated from weld toe at the corner. With the loading repetition, the cracks propagated along the weld toe. Finally, oblique cracks formed both in flange and web plate, and the pier was ruptured without local buckling. Although the cracks occurred at relatively early stage of the test, the loading capacity hardly decreased before failure. In other words, the crack propagation occupied the most part of life of the specimen. After the test, the low cycle fatigue strength of steel pier specimens was assessed based on the strain near the crack initiation point.

  152. Local strain approach to extremely low cycle fatigue assessment for thick-walled steel pier with box section

    Tao Chen, Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 9th Korea-Japan Joint Seminar on Steel Bridges     page: 235-246   2007.8

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    In a seismic event, steel piers may undergo large strain fluctuations of typically one to tens of cycles. That will possibly result in fracture of base end joints or beam-column joints, namely extremely low cycle fatigue. In this paper, thick walled un-stiffened box section steel piers subjected to incremental cyclic loading are analyzed by a three-dimensional elastic-plastic finite element analysis with shell and solid elements to investigate the behavior of local strain at weld toe. Several parameters, such as width thickness ratio, slenderness ratio, weld toe radius and axial loading, are taken into account. From engineering point of view, it is preferable to employ a simple parameter reflecting the local strain behavior. Here, the local strain is correlated to nominal strain, which is average strain along effective failure length by fiber model. Finally, a simple approach to extremely low cycle fatigue assessment is proposed and applied to test results.

  153. Low cycle fatigue assessment for welded joints based on local strain approach Reviewed

    Kazuo Tateishi, Takeshi Hanji, Tao Chen

    The 60th Annual Assembly of International Institute of Welding     page: XIII-2160-07   2007.6

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    As a method to predict fatigue strength of welded joints in extremely low cycle fatigue region, local strain based approach was discussed in this paper. Low cycle fatigue tests were conducted on T-shaped welded joints in order to find the crack initiation point and to obtain the fatigue life. On the other hand, local strain field around welded toe, where fatigue cracks were formed in fatigue tests, was analyzed by elasto-plastic finite element analysis, and the local strain amplitude at the cracking point was quantified. Based on the fatigue life obtained by fatigue test and the local strain amplitude by FEA, fatigue test results were compared with the low cycle fatigue strength curve, i.e., strain versus fatigue-life diagram. Test data were consistent with the strength curve. Consequently, it was demonstrated the fatigue assessment method based on local strain approach is available to predict the fatigue strength of welded joints even in extremely large strain region.

  154. A prediction model for extremely low cycle fatigue strength of structural steel Reviewed

    Kazuo Tateishi, Takeshi Hanji, Kuniaki Minami

    International Journal of Fatigue   Vol. 29 ( 5 ) page: 887-896   2007.5

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    Miner's rule has been accepted as a simple and effective method for predicting the low cycle fatigue life under variable strain amplitude. However, in an extremely large strain field, corresponding to the fatigue life of less than 10 cycles, the accuracy of Miner's rule has not been verified. In this study, low cycle fatigue tests under variable strain amplitude in an extremely large strain field were conducted with a newly developed testing system. Miner's rule always predicted a longer fatigue life than the observed life. A simple model introducing the damage mechanics concept was proposed and its validity was examined as another method for predicting low cycle fatigue
    life.

    DOI: 10.1016/j.ijfatigue.2006.08.001

  155. A new local strain based approach to low cycle fatigue assessment of welded joint Reviewed

    Kazuo Tateishi, Tao Chen, Takeshi Hanji

    Steel Construction Engineering, JSSC   Vol. 13 ( 52 ) page: 73-81   2006.12

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    Several T-shaped welded joint models are analyzed by finite element method for low cycle fatigue assessment in this paper. Joint is subjected to random loading blocks and strain history is counted by range pair-range counting method. Endeavor is exerted to correlate local strain range of coarse FE model that ignores the weld toe profile with strain range obtained by fine material properties and loading pattern are also taken into account. After that, strain range factor while others' effects are insignificant. At last, proposed approach is introduced to the analysis of T shaped welded joint test. It turns out simple and convenient in low cycle fatigue assessment since cumbersome modeling of weld local profile becomes not necessary.

    DOI: 10.11273/jssc1994.13.52_73

  156. A prediction model for extremely low cycle fatigue strength of structural steel and welded material Reviewed

    Kazuo Tateishi, Takeshi Hanji

    The 59th Annual Assembly of International Institute of Welding     page: XIII-2119-06   2006.7

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    Miner's rule has been accepted as a simple and effective idea for predicting the low cycle fatigue life under variable strain amplitude. However, in an extremely large strain field, corresponding to the fatigue life of less than ten cycles, the accuracy of Miner's rule has not been verified. In this study, low cycle fatigue tests under variable strain amplitude in an extremely large strain field were conducted with a newly developed testing system. Since test results indicated that Miner's rule always predicted a longer fatigue life than the observed life, we proposed a modified life prediction model introducing the damage mechanics concept and investigated its validity.

  157. Improvement of extremely low cycle fatigue strength of welded joints by TIG dressing Reviewed

    Takeshi Hanji, Kazuo Tateishi, Kazuya Kitoh, Kuniaki Minami

    Steel Construction Engineering, JSSC   Vol. 13 ( 50 ) page: 27-34   2006.6

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    In order to prevent the low cycle fatigue damage in existing steel bridge members as observed in the Hanshin-Awaji Great Earthquake in 1995, improving the fatigue strength of welded joints can be a realistic option. In this study, the effect of TIG dressing, which is one of the ways to finish the weld toe, was investigated. As a specimen, T-shape welded joint specimens were employed. Some specimens were finished with TIG dressing, and the others were left as-welded. The low cycle fatigue tests were conducted for these specimens in the same conditions. The test results indicated that TIG dressing made the low cycle fatigue life of welded joints much longer.

    DOI: 10.11273/jssc1994.13.50_27

  158. Extremely low cycle fatigue assessment for welded joints based on peak strain approach Reviewed

    Takeshi Hanji, Kazuo Tateishi, Kuniaki Minami, Kazuya Kitoh

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   ( 808/I-74 ) page: 137-145   2006.1

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    As an estimation method of low cycle fatigue strength of welded joint in extremely large strain field, fatigue assessment method based on peak strain approach was verified. T-shape welded joints were employed for the low cycle fatigue test. The local strain field around welded portion and the peak strain at the cracked point was analyzed by elasto-plastic finite element method. The relationship between the peak strain and the fatigue life was consistent with the fatigue strength curve proposed by the authors. Consequently, it was demonstrated the fatigue assessment method based on peak strain approach was available even in extremely large strain region.

    DOI: 10.2208/jsceja.62.101

  159. Extremely low cycle fatigue assessment method for welded joint by peak strain approach

    Takeshi Hanji, Kazuo Tateishi, Kazuya Kitoh

    Proceedings of 6th Japanese-German Bridge Symposium     page: CD-ROM   2005.8

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    As an estimation method of fatigue strength of welded joint in extremely low cycle fatigue region, peak strain based fatigue assessment method was verified. T-shape welded joints were employed for the verification test. The specimen was analyzed by elasto-plastic finite element method in order to quantify the local strain field around welded portion and the peak strain at the cracked point. On the other hand, fatigue life of the specimen was experimentally obtained by low cycle fatigue tests. The relationship between the peak strain and the fatigue life was consistent with the fatigue strength curve proposed by the authors. Consequently, it was demonstrated that the fatigue assessment method by peak strain approach was available even in extremely low cycle fatigue region.

  160. A prediction model for extremely low cycle fatigue life under variable strain amplitude

    Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 8th Japan-Korea Joint Seminar on Steel Bridges     page: 251-257   2005.8

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    Extensive experiments on low cycle fatigue for plain steel material have been conducted and obtained some important results. However there are few studies for extremely low cycle fatigue, corresponding to the strain more than 0.10.
    In this study, a new low cycle fatigue testing system, in which a steel plate specimen was subjected to bending deformation and the image technique was introduced to measure the strains in the specimen, was developed. The testing system has enabled the low cycle fatigue test with introducing extremely large strains into the specimen. Low cycle fatigue tests on plain steel plates under constant and variable strain amplitude were conducted by using the system. Based on the test results, an estimation method for low cycle fatigue strength in extremely low cycle fatigue region was proposed.

  161. Improvement of extremely low cycle fatigue strength of welded joints by TIG dressing

    Kazuo Tateishi, Takeshi Hanji, Kazuya Kitoh

    Proceedings of 6th Japanese-German Bridge Symposium     page: CD-ROM   2005.8

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    The improvement of extremely low cycle fatigue strength of welded joints by TIG dressing was investigated. T-shape welded joint specimens of which weld toes were finished by TIG dressing were tested. The fatigue test results were compared with that of as-weld specimens tested in the same conditions. The test results indicated that TIG dressing could substantially increase the extremely low cycle fatigue strength of welded joints.

  162. Low cycle fatigue testing system by means of image technique and its application to steel welded joints Reviewed

    Takeshi Hanji, Kazuo Tateishi

    Proceedings of the 1st International Conference on Advances in Experimental Structural Engineering     page: 603-609   2005.7

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    A new low cycle fatigue testing system has been developed, in which a steel plate specimen is subjected to bending deformation, and strains of the specimen are measured by image technique. In this study, the low cycle fatigue tests of steel welded joints under constant and variable strain amplitude, particularly the fatigue life less than ten cycles in extremely large strain field, was conducted by using the newly developed testing system. On the basis of the test results, the applicability of low cycle fatigue life prediction model was confirmed, which has been developed for plain steel material, to welded portion, such as deposit metal and heat affected zone (HAZ).

  163. Simple measuring method of surface profile of corroded steel plate by digital stereography Reviewed

    Kazuo Tateishi, Kengo Shibata, Takeshi Hanji

    Steel Construction Engineering, JSSC   Vol. 12 ( 46 ) page: 27-34   2005.6

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    Surface profile of structural members sometimes gives valuable information to estimate mechanical behavior of existing structures. In this study, based on stereography technique, a simple method to measure the surface profile was developed, and apllied to a corroded steel plate surface. The method gave good results even for corroded steel plate surface which has few image patters and characteristics. The accuracy of the method was also discussed on the results for a variety of system conditions, such as camera position and camera resolution.

    DOI: 10.11273/jssc1994.12.46_27

  164. A prediction model for extremely low cycle fatigue strength of welded materials Reviewed

    Kazuo Tateishi, Takeshi Hanji, Kazuya Kitoh, Kuniaki Minami

    Journal of Structural Engineering, JSCE   Vol. 51A   page: 1275-1282   2005.3

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    We investigated the low cycle fatigue strength of welded materials under constant and variable strain amplitude in extremely large strain region. The test results indicated that fatigue strength of welded materials, particularly heat-affected zone (HAZ), was much lower than that of plain material. We then developed a model to predict the extremely low cycle fatigue strength of welded materials. Fatigue life estimated by this model was well agreed with test results.

  165. Low cycle fatigue strength of butt-welded steel joint by means of new testing system with image technique Reviewed

    Kazuo Tateishi, Takeshi Hanji

    International Journal of Fatigue   Vol. 26 ( 12 ) page: 1349-1356   2004.12

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    In this study, we investigated the low cycle fatigue strength of welded joints using a new fatigue testing system in which the image analysis technique was used to measure the strains in specimens. After checking the validity of the testing system, we used this new system to conduct fatigue tests on welded joint specimens. The test results indicate that the fatigue strength of welded material (weld deposit and heat affected zone) is much lower than that of the plain material.

    DOI: 10.1016/j.ijfatigue.2004.03.016

  166. Low cycle fatigue strength of welded joints in extreme large strain field Reviewed

    Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 2nd International Conference on Bridge Maintenance, Safety, Management and Cost     page: CD-ROM   2004.10

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    Authors have developed a new low cycle fatigue testing method, in which a specimen is subjected to bending deformation and strain of the specimen is measured by image analysis. The advantage of this method is to be able to induce extreme large strain in steel plate even if it includes welding. In this study, the fatigue strength of welded joints in extreme large strain field was investigated by a newly developed testing system. The test results indicated that the fatigue strength of welded joints was much lower than that of plain material, and heat affected zone (HAZ) was the weakest spot.

  167. Low cycle fatigue strength of steel in extreme large strain field Reviewed

    Kazuo Tateishi, Takeshi Hanji

    Proceedings of the 3rd International Conference on Earthquake Engineering     page: 561-565   2004.10

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    Extensive experiments on the low cycle fatigue for plain steel material have been conducted and obtained some important results. There are few studies, however, on the low cycle fatigue in the extreme large strain field, corresponding to the fatigue life less than ten cycles.
    In this study, we developed a new low cycle fatigue testing system, in which a specimen was subjected to bending deformation and the strain in the specimen was measured by image analysis technique. Low cycle fatigue tests on plain steel plates under constant and variable strain amplitude were conducted by using the testing system. Based on the test results, an estimation method for low cycle fatigue strength in the extreme large strain field was proposed.

  168. A prediction model for extremely low cycle fatigue life under variable strain amplitude Reviewed

    Kazuo Tateishi, Takeshi Hanji, Kuniaki Minami

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   ( 773/I-69 ) page: 149-158   2004.10

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    For predicting the low cycle fatigue life under variable strain amplitude, Miner's rule has been accepted as a simple and effective idea. In extreme large strain field corresponding to the fatigue life of less than ten cycles, however, the accuracy of Miner's rule has not been verified yet. In this study, by means of a newly developed testing system, low cycle fatigue tests under variable strain amplitude in extreme large strain field was conducted. The test results showed Miner's rule always predicted longer fatigue life than actual life. As another idea for predicting low cycle fatigue life, we proposed a simple model introducing the damage mechanics concept and examined its validity.

    DOI: 10.2208/jscej.2004.773_149

  169. A study on low cycle fatigue strength of welded joints by means of testing system with image analysis Reviewed

    Kazuo Tateishi, Takeshi Hanji

    Journal of Structural Mechanics and Earthquake Engineering, JSCE   ( 752/I-66 ) page: 277-287   2004.1

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    Low cycle fatigue strength of welded joints was investigated by means of newly developed fatigue testing system in which image analysis technique was applied to measure the strain of specimens. It was validated that the strain measured by the image analysis was almost equal to measured value by strain gauge, and the low cycle fatigue strength of steel plate without welding was in good agreement with the results reported in former researches. After verifying the testing system, fatigue tests were carried out on welded joint specimens. The test results indicated that the low cycle fatigue strength of welded joints was much lower than that of plain material, and fatigue life was reduced by half.

    DOI: 10.2208/jscej.2004.752_277

  170. 3-D shape measurement of corroded surface by using digital stereography Reviewed

    Takeshi Hanji, Kazuo Tateishi, Kazuki Kitagawa

    Proceedings of the 1st International Conference on Structural Health Monitoring and Intelligent Infrastructure     page: 699-704   2003.11

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  171. A study on low cycle fatigue strength of butt welded joint by means of image analysis technique

    Kazuo Tateishi, Takeshi Hanji

    Proceedings of 5th Japanese-German Joint Symposium on Steel and Composite Bridges     page: 405-409   2003.9

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    Since Great Hanshin-Awaji Earthquake caused low cycle fatigue failures at base joints and beam-to-column connections in steel piers, it is important to investigate the low cycle fatigue strength of welded joints in civil structures. In this study, low cycle fatigue strength of welded joints was investigated by means of a new fatigue testing system in which image analysis technique was introduced to measure the strain of specimens. It was validated that the strains measured by the image analysis were almost equal to those by strain gauges, and the low cycle fatigue strength of plain steel plate was in good agreement with the result reported in the former studies. The low cycle fatigue tests carried out on welded joint specimens indicated that the fatigue strength of the welded joints was much lower than that of plain material.

  172. Low cycle fatigue testing system by means of image analysis technique

    Takeshi Hanji, Kazuo Tateishi

    Proceedings of the 7th Korea-Japan Joint Seminar on Steel Bridges     page: 441-449   2003.8

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    Almost all the low cycle fatigue cracks observed in Hanshin-Awaji Earthquake were initiated from welded joints. In this study, a new testing system was developed, which enables the investigation on the low cycle fatigue strength of welded joints. In this testing system, a specimen was subjected to bending deformation, and the strain in the specimen was measured by means of image analysis technique. It was shown that the strains measured by the image analysis were almost equal to those measured by strain gauges, and the low cycle fatigue strength of plain steel material obtained by this testing system was in good agreement with the results reported in former studies.

  173. Method for estimating fatigue crack propagation rate for a crack in welded joints Reviewed

    Kazuo Tateishi, Takeshi Hanji, Satoshi Yamada, Makoto Abe

    Steel Construction Engineering, JSSC   Vol. 8 ( 31 ) page: 11-16   2001.9

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    Recently, a lot of fatigue cracks have been found in steel bridges to the increase of the large-scale vehicles in number as well as weight. In order to consider a repairing this study, a method to estimate the fatigue crack propagation rate is proposed, which is based on the crack opening width measured by image analysis on a digital image recorded with a portable digital microscope. The accuracy and limitation of the method were investigated through a fatigue test carried out on a fatigue crack in welded joint specimen.

    DOI: 10.11273/jssc1994.8.31_11

  174. Estimation method for crack propagation behavior in welded joint

    Kazuo Tateishi, Takeshi Hanji, Makoto Abe

    Proceedings of the 6th Korea-Japan Joint Seminar on Steel Bridges     page: 369-373   2001.8

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  175. Monitoring system for fatigue crack propagation by image analysis

    Kazuo Tateishi, Takeshi Hanji, Makoto Abe

    Current and Future Trends in Bridge Design, Construction and Maintenance   Vol. 2   page: 256-260   2001

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  176. 溶接継手部に生じた疲労き裂の応力拡大係数の推定手法 Reviewed

    舘石和雄,判治剛,山田聡,阿部允

    鋼構造年次論文報告集   Vol. 8   page: 617-620   2000.11

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Books 10

  1. JSSCテクニカルレポートNo.120 鋼橋の強靭化・長寿命化に向けた疲労対策技術資料

    疲労強度研究部会( Role: Joint author)

    日本鋼構造協会  2020.10 

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    Language:Japanese

  2. 鋼道路橋疲労設計便覧 Reviewed

    日本道路協会( Role: Joint author)

    日本道路協会  2020.9 

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    Language:Japanese

  3. JSSCテクニカルレポートNo.115 鋼橋の疲労対策のための技術資料

    疲労強度研究部会( Role: Joint author)

    日本鋼構造協会  2018.8 

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    Language:Japanese

  4. 道路橋示方書(II鋼橋・鋼部材編)・同解説 Reviewed

    日本道路協会( Role: Joint author)

    日本道路協会  2017.11 

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  5. 土木学会 2016年制定 鋼・合成構造標準示方書 総則編・構造計画編・設計編

    鋼・合成構造標準示方書小委員会( Role: Joint author)

    土木学会  2016 

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    Language:Japanese

  6. JSSCテクニカルレポートNo.106 鋼橋溶接継手部の疲労強度とその向上技術

    疲労強度研究部会( Role: Joint author)

    日本鋼構造協会  2015 

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    Language:Japanese

  7. 社会インフラ メンテナンス学

    橋本鋼太郎他( Role: Joint author)

    土木学会  2015 

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    Language:Japanese

  8. JSSCテクニカルレポートNo.99 溶接継手の新たな疲労強度等級分類のための技術資料

    疲労強度研究部会( Role: Joint author)

    日本鋼構造協会  2013 

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  9. 土木学会鋼構造シリーズ22 鋼橋の疲労対策技術

    鋼橋の疲労対策に関する新技術調査研究小委員会( Role: Joint author)

    土木学会  2013 

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  10. JSSCテクニカルレポートNo.84 疲労損傷を受けた鋼橋の耐久性評価および耐久性向上技術

    疲労強度研究部会( Role: Joint author)

    日本鋼構造協会  2009 

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Presentations 213

  1. リベットと高力ボルトと併用した継手の限界状態に関する解析的検討

    鷲見俊哉,判治剛,舘石和雄,清水優,長坂康史,竹渕敏郎

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  2. 低サイクル疲労き裂を起点とするぜい性破壊の発生可能性に関する基礎的研究

    荒川純,判治剛,舘石和雄,清水優

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  3. 低変態温度溶接材料を用いて製作した溶接継手の疲労強度

    益井駿介,判治剛,舘石和雄,清水優,津山忠久,小谷祐樹,竹渕敏郎

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  4. ピンの振動エネルギーに基づくピーニング処理の品質管理の試み

    加納俊,判治剛,舘石和雄,清水優,小野秀一,井上一磨

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  5. コーナープレート端部切欠き部の疲労耐久性とピーニングによる延命効果

    清水優,舘石和雄,判治剛,藤林美早,岡本亮二,西芝貴光

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  6. 静的荷重下でピーニング処理された面外ガセット溶接継手の板曲げ疲労強度と残留応力

    判治剛,加納俊,舘石和雄,清水優

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  7. 既設鋼床版のUリブ・デッキプレート溶接部の疲労損傷に対する下面からの対策検討

    服部雅史,舘石和雄,判治剛,清水優

    第76回土木学会年次学術講演会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  8. Fatigue strength and residual stress of longitudinal attachment joints improved by HFMI treatment under static load International conference

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu

    The 74th Annual Assembly of IIW  International Institute of Welding

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    Event date: 2021.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  9. Prediction of residual stress induced by high-frequency mechanical impact treatment International conference

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu

    The 74th Annual Assembly of IIW  International Institute of Welding

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    Event date: 2021.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

  10. Investigation on low cycle fatigue crack propagation in steel under fully random variable amplitude loading

    Arief Panjaitan, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    67th Symposium on Structural Engineering 

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    Event date: 2021.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  11. Local stress based fatigue assessment of welded joints in steel-concrete composite slab using angle-shape shear connectors International conference

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Koichi Asano, Takaaki Ishii, Kiyoshi Kobayashi, Daisuke Uchida

    10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020) 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1201/9780429279119-365

  12. Fatigue behavior of bearing type bolted joint with pultruded CFRP composites International conference

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Yasuo Kitane

    10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020) 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1201/9780429279119-496

  13. Reduction of stress concentration at drilled hole due to adding splice plates International conference

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020) 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1201/9780429279119-478

  14. Crack sizing accuracy of a phased array ultrasonic scanner developed for inspection of rib-to-deck welded joints in orthotropic steel bridge decks International conference

    Masafumi Hattori, Tohru Makita, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Naoto Yagi

    10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020) 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1201/9780429279119-540

  15. 変動振幅下における低サイクル疲労き裂の進展挙動予測

    清水優,舘石和雄,判治剛,Panjaitan A.

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  16. 高力ボルトで当て板補修されたストップホールの簡易解析法

    清川昇悟,判治剛,加藤遼二郎

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  17. UHPFRCにより補強したUリブ鋼床版の自然環境状態での輪荷重走行試験

    服部雅史,舘石和雄,判治剛,清水優

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  18. リベットと高力ボルトを併用した継手の力学性状に関する基礎的研究

    鷲見俊哉,判治剛,舘石和雄,清水優,長坂康史,竹渕敏郎

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  19. FRP引抜成形部材ボルト継手部の疲労強度

    廣山佳生,舘石和雄,判治剛,清水優

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  20. Low cycle fatigue assessment of joint structure in steel truss bridges under earthquake

    Jiang C.,判治剛,舘石和雄,清水優

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  21. 疲労き裂の進展に伴う面外ガセット溶接継手の残留応力再配分に関する解析的検討

    益田裕太,判治剛,舘石和雄,清水優

    第75回土木学会年次学術講演会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  22. せん断パネルダンパー溶接部から発生する低サイクル疲労の照査法

    清水優,舘石和雄,判治剛,青木康素

    鋼構造シンポジウム2019 

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    Event date: 2019.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  23. 鋼・コンクリート合成床版のL形鋼ジベル溶接部の疲労強度

    判治剛,舘石和雄,清水優,浅野浩一,石井孝明,小林潔,内田大介

    第13回複合・合成構造の活用に関するシンポジウム 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  24. CFRP引抜成形部材支圧接合部の疲労強度評価

    清水優,舘石和雄,判治剛,北根安雄,廣山佳生

    第13回複合・合成構造の活用に関するシンポジウム 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  25. Estimation of fatigue crack propagation behavior in steel plate subjected to out of plane bending International conference

    Kentaro Horio, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    ISSS 2019 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  26. Fatigue crack propagation analysis of longitudinal welded joint containing blowholes International conference

    Cut Atika Putri, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    ISSS 2019 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  27. Fatigue crack initiation assessment of load-carrying cruciform welded joints under low cycle actions International conference

    Yuko Ohashi, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    ISSS 2019 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  28. Local strain based low cycle fatigue assessment of gusset plates in steel truss bridges under earthquake International conference

    Chao Jiang, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    ISSS 2019 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  29. A prediction method for fatigue enhancement of drilled crack-arrest holes accompanied by splice plates International conference

    Takeshi Hanji, Shogo Kiyokawa, Kazuo Tateishi, Masaru Shimizu

    12th Pacific Structural Steel Conference 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  30. A proposal on reduction of welding residual stress in rib-to-deck welded joint in orthotropic steel deck International conference

    Cut Atika Putri, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    12th Pacific Structural Steel Conference 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  31. Evaluation of low cycle fatigue crack propagation under various controlled cyclic loading histories International conference

    Arief Panjaitan, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    12th Pacific Structural Steel Conference 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  32. Low cycle fatigue behavior of load-carrying cruciform welded joints with incomplete penetration International conference

    Yuko Ohashi, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    12th Pacific Structural Steel Conference 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  33. Fatigue strength of single-sided fillet welded joints with low transformation temperature welding material International conference

    Suguru Kano, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Tadahisa Tsuyama, Toshio Takebuchi

    12th Pacific Structural Steel Conference 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  34. A study on fatigue crack propagation behavior on steel plate subjected to out of plane bending International conference

    Kentaro Horio, Kazuo Tateishi, Masaru Shimizu, Takeshi Hanji

    12th Pacific Structural Steel Conference 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  35. 当て板補修された疲労き裂ストップホールにおけるボルト締めの効果

    清川昇悟,判治剛,清水優,舘石和雄

    第74回土木学会年次学術講演会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  36. 疲労き裂の進展に伴う溶接継手の残留応力再配分に関する実験的研究

    益田裕太,判治剛,舘石和雄,清水優

    第74回土木学会年次学術講演会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  37. 低変態温度溶接材料を用いた片面すみ肉溶接接手の板曲げ疲労強度

    加納俊,判治剛,舘石和雄,清水優,津山忠久,竹渕敏郎

    第74回土木学会年次学術講演会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  38. Fatigue strength of transverse attachment joints with single-sided weld using low transformation temperature welding consumable International conference

    Takeshi Hanji, Kazuo Tateishi, Suguru Kano, Masaru Shimizu, Tadahisa Tsuyama, Toshiro Takebuchi

    The 72nd Annual Assembly of IIW 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Slovakia  

  39. 腐食した鉄筋の疲労寿命予測

    判治剛,アフマドザイ ニアマチュラ,舘石和雄,清水優

    鋼構造シンポジウム2018 

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    Event date: 2018.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  40. 疲労き裂部への高力ボルト当て板補強におけるすべり耐力に関する検討

    清川昇悟,判治剛,清水優,舘石和雄

    鋼構造シンポジウム2018 

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    Event date: 2018.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  41. 面外曲げを受ける鋼板の疲労き裂進展挙動に関する研究

    堀尾健太郎,舘石和雄,判治剛,清水優

    第73回土木学会年次学術講演会 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  42. 鋼製橋脚基部に対する簡易な低サイクル疲労照査のための疲労強度等級分類の提案

    古崎智大,舘石和雄,判治剛,清水優

    第73回土木学会年次学術講演会 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  43. L形鋼をずれ止めに用いた鋼・コンクリート合成床版に生じる局部応力

    判治剛,白井晴也,舘石和雄,清水優,内田大介,浅野浩一,石井孝明,小林潔

    第73回土木学会年次学術講演会 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  44. 高力ボルト摩擦接合継手の構造諸元が応力集中に与える影響

    清川昇悟,舘石和雄,判治剛,清水優

    第73回土木学会年次学術講演会 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  45. 未溶着を含む荷重伝達型十字溶接継手の低サイクル疲労強度と破壊起点

    大橋優子,判治剛,舘石和雄,清水優

    第73回土木学会年次学術講演会 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  46. 溶接止端部に生じた疲労き裂に対するストップホール法の補修効果

    鈴木元啓,小野友暉,木下幸治,穴見健吾,判治剛,内田大介

    第73回土木学会年次学術講演会 

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  47. Effect of weld penetration on low cycle fatigue strength of load-carrying cruciform joints International conference

    Takeshi Hanji, Kazuo Tateishi, Yuko Ohashi, Masaru Shimizu

    The 71st Annual Assembly of IIW 

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    Event date: 2018.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Indonesia  

  48. 当て板によるストップホール部の応力集中低減効果

    清川昇悟,舘石和雄,判治剛,清水優,中山裕哉

    第64回構造工学シンポジウム 

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    Event date: 2018.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  49. 当て板補強が施されたストップホールのひずみ推定法

    清川昇悟,舘石和雄,判治剛,清水優,中山裕哉

    第64回構造工学シンポジウム 

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    Event date: 2018.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  50. 鉄道橋Iビーム桁支点首部における疲労き裂対策の効果検証

    池頭賢,丹羽雄一郎,松本健太郎,判治剛,舘石和雄

    鋼構造シンポジウム2017 

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    Event date: 2017.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  51. Slip coefficient and fracture strength of high strength bolted friction joints with compact bolt spacing and edge distance International conference

    Shogo Kiyokawa, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    ISSS 2017 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  52. Influence of shear panel shape in multiple steel columns on low cycle fatigue International conference

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Hiroshi Noda, Hiroki Sugiyama, Yasumasa Soga

    ISSS 2017 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  53. Evaluation of repair effect for cracked I-beam end in railway steel bridges International conference

    Haruya Shirai, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Masaki Iwai, Ken Ikegashira, Yuichiro Niwa

    ISSS 2017 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  54. A simple low cycle fatigue assessment method for steel members and its application to bridge piers under earthquake International conference

    Tomohiro Furusaki, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Naoya Honda

    ISSS 2017 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  55. Fatigue life prediction of corroded reinforcing steel bars International conference

    Takeshi Hanji, Niamatullah Ahmadzai, Kazuo Tateishi, Masaru Shimizu

    ISSS 2017 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  56. 鋼製橋脚基部の簡易な低サイクル疲労照査法と地震時の損傷度評価への適用

    本田直也,舘石和雄,判治剛,清水優

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  57. 小径ストップホールの径と位置が溶接部の応力集中に与える影響

    鈴木元啓,木下幸治,穴見健吾,判治剛,内田大介

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  58. 鉄道橋Iビーム桁支点首部に発生した疲労き裂調査

    池頭賢,丹羽雄一郎,岩井将樹,判治剛,舘石和雄

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  59. 鉄道橋Iビーム桁支点首部の疲労き裂に対するストップホールの補修効果の評価

    岩井将樹,判治剛,舘石和雄,清水優,池頭賢,丹羽雄一郎

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  60. 高力ボルト当て板補修された疲労き裂の応力集中に与える影響

    中山裕哉,清川昇悟,判治剛,舘石和雄,清水優

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  61. レーザ・アークハイブリッド溶接を用いた十字および縦方向継手の疲労強度

    判治剛,舘石和雄,清水優,澤井公哉,内田大介,浅野浩一,木村陵介

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  62. せん断パネル溶接部に対する低サイクル疲労き裂発生寿命の簡易照査法

    清水優,舘石和雄,判治剛,曽我恭匡

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  63. ボルト間隔および縁端距離が小さい高力ボルト摩擦接合継手の静的引張試験

    清川昇悟,舘石和雄,判治剛,清水優

    第72回土木学会年次学術講演会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  64. Fatigue strength of cruciform joints and longitudinal joints with laser-arc hybrid welding International conference

    Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Daisuke Uchida, Koichi Asano, Ryosuke Kimura

    The 70th Annual Assembly of IIW 

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    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  65. 止端処理による溶接継手の疲労強度改善効果とその鋼材強度依存性

    判治剛,穴見健吾

    第63回構造工学シンポジウム 

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    Event date: 2017.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  66. 鋼床版横リブスリット溶接部の疲労強度向上法に関する基礎的研究

    判治剛,伊藤あゆみ,舘石和雄,清水優

    鋼構造シンポジウム2016 

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    Event date: 2016.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  67. 角形鋼管を用いた溶接継手に対する低サイクル疲労き裂進展評価

    判治剛,寺尾名央,舘石和雄,清水優

    鋼構造シンポジウム2016 

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    Event date: 2016.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  68. Crack propagation life prediction for welded joints in low cycle fatigue region International conference

    Takeshi Hanji, Nao Terao, Kazuo Tateishi, Masaru Shimizu

    11th Pacific Structural Steel Conference 

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    Event date: 2016.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  69. 鋼管集成橋脚せん断パネル接合部の低サイクル疲労照査

    野田拓史,舘石和雄,判治剛,清水優,足立陸,杉山裕樹

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  70. 疲労強度の信頼性向上に向けた疲労試験データベースの活用と今後の課題

    石原大作,青木康素,村越潤,森猛,舘石和雄,判治剛

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  71. 鉄道橋Iビーム桁支点首部の疲労き裂の進展性状に関する研究

    岩井将樹,判治剛,舘石和雄,清水優,加瀬駿介,丹羽雄一郎,池頭賢

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  72. 溶接継手に生じた疲労き裂に対するCFRP接着補修の効果に関する研究

    金山由布子,判治剛,舘石和雄,清水優,服部真未子,牛田健友

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  73. 角形鋼管を平板に溶接した継手の低サイクル疲労寿命予測

    判治剛,寺尾名央,舘石和雄,清水優

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  74. 繰返し曲げ負荷を受ける鋼板の背面き裂発生条件に関する研究

    白井晴也,判治剛,舘石和雄,清水優

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  75. 荷重伝達型十字継手におけるのど断面応力の推定に関する研究

    古崎智大,舘石和雄,判治剛,清水優

    第71回土木学会年次学術講演会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  76. Characteristics of fatigue crack propagation in I-beam end of railway steel bridges International conference

    Masaki Iwai, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Shunsuke Kase, Yuichiro Niwa, Ken Ikegashira

    11th German-Japanese Bridge Symposium 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  77. Low cycle fatigue verification of connection part in the shear panel in multiple steel columns International conference

    Hiroshi Noda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Riku Adachi, Hiroki Sugiyama

    11th German-Japanese Bridge Symposium 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  78. Fatigue strength improvement for welded joints simulating longitudinal-to-transverse rib connection in orthotropic steel deck International conference

    Ayumi Ito, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    11th German-Japanese Bridge Symposium 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  79. Effect of static strength of steel on fatigue strength improvement by introducing compressive residual stress International conference

    Hiroki Takamatsu, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    11th German-Japanese Bridge Symposium 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  80. Fatigue life extension for a crack in welded joints by CFRP repair International conference

    Yuko Kanayama, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Mamiko Hattori, Kenyu Ushida

    11th German-Japanese Bridge Symposium 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  81. Fatigue strength of load-carrying cruciform welded joints with Laser-arc hybrid welding International conference

    Naoya Honda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Daisuke Uchida, Koichi Asano

    11th German-Japanese Bridge Symposium 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  82. Fatigue crack growth prediction of welded joints in low cycle fatigue region International conference

    Takeshi Hanji, Kazuo Tateishi, Nao Terao, Masaru Shimuzu

    The 69th Annual Assembly of IIW 

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    Event date: 2016.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Australia  

  83. 付加板が近接する溶接継手の疲労強度とICR処理による延命効果

    判治剛,舘石和雄,清水優,加瀬駿介,岩井将樹

    第62回構造工学シンポジウム 

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    Event date: 2016.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  84. Displacement based fatigue strength evaluation for root failure in fillet weld joints International conference

    Kazuo Tateishi, Naohiro Soda, Takeshi Hanji, Masaru Shimizu

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  85. An estimation method for weld crack initiation in weld repair under cyclic loading International conference

    Takeshi Hanji, Yoshio Hasegawa, Kazuo Tateishi, Masaru Shimizu

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  86. A prediction method for extremely low cycle fatigue crack propagation of structural steels International conference

    Nao Terao, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  87. Redistribution behavior of residual stress due to weld toe grinding International conference

    Satoshi Maeda, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  88. Fatigue life prediction for cracked steel plates repaired with CFRP International conference

    Mamiko Hattori, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  89. Analytical study on low cycle fatigue of shear panel in multiple steel columns International conference

    Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Riku Adachi

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  90. Fatigue strength of welded joint with adjacent attachments International conference

    Shunsuke Kase, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu

    ISSS 2015 

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    Event date: 2015.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  91. グラインダー処理による溶接残留応力の再分配挙動に関する研究

    前田諭志,舘石和雄,判治剛,清水優

    鋼構造シンポジウム2015 

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    Event date: 2015.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  92. 圧縮残留応力導入による疲労強度改善効果の鋼材強度依存性

    高松弘貴,判治剛,舘石和雄,清水優,穴見健吾

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  93. 繰返し荷重下での溶接補修における割れ発生評価法に関する研究

    判治剛,長谷川吉男,舘石和雄,清水優

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  94. 鋼床版縦リブと横リブスリットの溶接部の疲労強度とき裂補修法

    伊藤あゆみ,判治剛,舘石和雄,清水優

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  95. ICR処理を施した表面き裂の応力拡大係数の評価法

    清水優,判治剛,舘石和雄,鶴田義隆

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  96. 付加板が近接する溶接継手の疲労強度

    加瀬駿介,舘石和雄,判治剛,清水優

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  97. レーザ・アークハイブリッド溶接を用いた荷重伝達型十字継手の疲労強度

    本田直也,舘石和雄,判治剛,清水優,浅野浩一

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  98. ルート破壊を対象とした未溶着部の変位による疲労強度評価法

    舘石和雄,早田直広,判治剛,清水優

    第70回土木学会年次学術講演会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  99. Fatigue strength evaluation method of connection between longitudinal closed ribs and cross-beam web cutouts in orthotropic steel bridge decks International conference

    Takeshi Hanji, Kazuo Tateishi, Keito Kato

    IABSE Conference Nara 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  100. Crack propagation behaviour of structural steel in extremely low cycle fatigue region International conference

    Nao Terao, Takeshi Hanji, Kazuo Tateishi

    IABSE Conference Nara 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  101. Simple repair method for fatigue cracks in welded joints by resin injection International conference

    Mamiko Hattori, Takeshi Hanji, Kazuo Tateishi

    IABSE Conference Nara 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  102. 局部ひずみを基準とした異形鉄筋の低サイクル疲労強度評価法

    判治剛,舘石和雄,永松直樹

    第61回構造工学シンポジウム 

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    Event date: 2015.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  103. 引張または曲げ荷重を受ける溶接継手に対するICR処理の効果

    舘石和雄,判治剛,石川敏之,清水優

    第61回構造工学シンポジウム 

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    Event date: 2015.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  104. Extremely low cycle fatigue assessment of corner crack in concrete-filled steel piers based on effective notch strain approach

    Jin-Eun Park, Takeshi Hanji, Kazuo Tateishi

    61st Symposium on Structural Engineering 

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    Event date: 2015.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  105. 溶接継手の残留応力低減による疲労寿命改善効果に関する一考察

    舘石和雄,判治剛

    鋼構造シンポジウム2014 

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    Event date: 2014.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  106. グラインダー処理による溶接残留応力の再分配挙動に関する研究

    前田諭志,舘石和雄,判治剛

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  107. 極低サイクル疲労領域における鋼材のき裂進展挙動

    寺尾名央,判治剛,舘石和雄

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  108. Evaluation of low cycle fatigue strength of corner welded joints based on effective notch strain

    Jin-Eun Park, Takeshi Hanji, Kazuo Tateishi

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  109. 鋼床版縦リブと横リブスリットの溶接部の疲労強度評価法

    判治剛,加藤啓都,舘石和雄

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  110. 樹脂注入による溶接継手の疲労き裂補修法に関する研究

    服部真未子,判治剛,舘石和雄

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  111. 垂直補剛材と水平補剛材交差部の応力分布に関する研究

    足立陸,舘石和雄,判治剛,清水優

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  112. 繰返し荷重下における溶接施工性に関する研究

    長谷川吉男,判治剛,舘石和雄

    第69回土木学会年次学術講演会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  113. Low cycle fatigue assessment for corner joints based on effective notch strain approach International conference

    Takeshi Hanji, Jin-Eun Park, Kazuo Tateishi

    The 67th Annual Assembly of IIW 

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    Event date: 2014.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  114. 橋梁用高降伏点鋼板(SBHS)を用いた溶接継手の疲労特性

    判治剛,舘石和雄,小野秀一,段下義典

    第60回構造工学シンポジウム 

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    Event date: 2014.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  115. コンクリートを充填した矩形断面鋼製橋脚の低サイクル疲労挙動

    朴鎭垠,判治剛,舘石和雄

    鋼構造シンポジウム2013 

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    Event date: 2013.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  116. Low cycle fatigue characteristics of steel deformed bars International conference

    Takeshi Hanji, Kazuo Tateishi, Kenyuu Ushida, Naoki Nagamatsu, Sung-Min Choi

    10th Pacific Structural Steel Conference 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Singapore  

  117. Fatigue life extension of cracked welded joints by ICR treatment under tensile loading International conference

    Kazuo Tateishi, Takeshi Hanji, Yoshitaka Tsuruta, Sho Sasada, Sung-Min Choi

    10th Pacific Structural Steel Conference 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Singapore  

  118. Low cycle fatigue assessment of steel bridge piers subjected to long duration ground motions International conference

    Takeshi Hanji, Kazuo Tateishi, Shun Ukai, Sung-Min Choi

    10th Pacific Structural Steel Conference 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Singapore  

  119. Fatigue strength of welded joints using steels for bridge high performance structures (SBHS) International conference

    Takeshi Hanji, Kazuo Tateishi, Shuichi Ono, Yoshinori Danshita, Sung-Min Choi

    13th East Asia-Pacific Conference on Structural Engineering and Construction 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  120. Local stress behavior at closed rib to crossbeam connections in orthotropic steel bridge decks International conference

    Keito Kato, Takeshi Hanji, Kazuo Tateishi, Sung-Min Choi, Shigeyuki Hirayama

    13th East Asia-Pacific Conference on Structural Engineering and Construction 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  121. 長時間継続地震動下での鋼製橋脚の低サイクル疲労性能

    判治剛,舘石和雄,鵜飼隼

    第68回土木学会年次学術講演会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  122. 引張荷重を受ける溶接継手に対するICR処理の効果

    鶴田義隆,舘石和雄,判治剛,笹田翔

    第68回土木学会年次学術講演会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  123. 繰返し荷重下における鋼橋の溶接補修に関する基礎的研究

    長谷川吉男,判治剛,舘石和雄

    第68回土木学会年次学術講演会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  124. 低温変態溶接材料を用いた溶接継手の残留応力に関する研究

    早田直広,舘石和雄,判治剛

    第68回土木学会年次学術講演会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  125. Low cycle fatigue behavior of concrete-filled steel piers

    朴鎭垠,判治剛,舘石和雄

    第68回土木学会年次学術講演会 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  126. 異形鉄筋の低サイクル疲労強度とその評価法

    牛田健友,判治剛,舘石和雄,永松直樹

    第68回土木学会年次学術講演会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  127. Fatigue strength evaluation of out-of-plane gusset weld joint International conference

    Kengo Anami, Yusuke Goda, Daisuke Uchida, Takeshi Hanji, Shigeyuki Hirayama

    12th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  128. A study on weld repair of steel members under cyclic loading International conference

    Yoshio Hasegawa, Takeshi Hanji, Kazuo Tateishi, Sung-Min Choi

    12th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  129. Residual stress distribution in welded joints by applying low-temperature transformation welding material International conference

    Naohiro Souda, Kazuo Tateishi, Takeshi Hanji

    12th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  130. Local stress characteristics at cross-beam web cutout in closed rib orthotropic deck International conference

    Takeshi Hanji, Keito Kato, Kazuo Tateishi, Sung-Min Choi, Shigeyuki Hirayama

    3rd Orthotropic Bridge Conference 

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    Event date: 2013.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  131. 閉断面リブを有する鋼床版の横リブスリット部の局部応力特性

    判治剛,加藤啓都,舘石和雄,崔誠珉,平山繁幸

    第59回構造工学シンポジウム 

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    Event date: 2013.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  132. Experimental study on low cycle fatigue behavior of concrete-filled steel bridge piers International conference

    Jin-Eun Park, Takeshi Hanji, Kazuo Tateishi, Sung-Min Choi

    9th German-Japanese Bridge Symposium 

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    Event date: 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  133. 面外曲げを受ける溶接継手への溶接補修の適用性に関する検討

    鶴田義隆,判治剛,舘石和雄,崔誠珉

    第67回土木学会年次学術講演会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  134. 橋梁用高降伏点鋼板(SBHS)を用いた溶接継手の疲労特性

    判治剛,舘石和雄,山田佑二,崔誠珉

    第67回土木学会年次学術講演会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  135. 橋梁用高降伏点鋼板(SBHS)溶接継手の疲労強度とICR補修

    小野秀一,巽吉生,舘石和雄,判治剛

    第67回土木学会年次学術講演会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  136. 鋼橋ブラケットと主桁溶接部の局部応力と疲労強度

    高瀬達也,舘石和雄,判治剛,崔誠珉,吉嶺建史

    第67回土木学会年次学術講演会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  137. 鋼床版縦リブ・横リブ交差部の局部応力挙動に関する検討

    加藤啓都,判治剛,舘石和雄,崔誠珉,平山繁幸

    第67回土木学会年次学術講演会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  138. 溶接継手止端部に生じる局部応力の簡易推定法の提案とそれによる疲労強度評価

    舘石和雄,判治剛,成瀬渉,伊藤功,崔誠珉

    第58回構造工学シンポジウム 

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    Event date: 2012.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  139. Low cycle fatigue design curves for base joints of steel bridge piers International conference

    Takeshi Hanji, Kazuo Tateishi

    Workshop on Advances in Seismic Experiments and Computations 

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    Event date: 2012.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  140. Retardation of fatigue crack propagation in welded joints under plate bending by hardening material injection International conference

    Kazuo Tateishi, Ryuichi Tsuboi, Takeshi Hanji

    6th International Symposium on Steel Structures 

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    Event date: 2011.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  141. 溶接止端処理による鋼製橋脚基部の極低サイクル疲労強度向上法

    判治剛,永松直樹,舘石和雄

    鋼構造シンポジウム2011 

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    Event date: 2011.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  142. 破壊力学による溶接継手の疲労寿命のばらつきの評価

    舘石和雄,吉田守孝,判治剛

    鋼構造シンポジウム2011 

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    Event date: 2011.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  143. ブラケット基部の疲労に関する研究

    鵜飼隼,舘石和雄,判治剛,吉嶺建史

    第66回土木学会年次学術講演会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  144. グラインダー処理による鋼製橋脚基部の極低サイクル疲労強度向上効果に関する研究

    永松直樹,判治剛,舘石和雄

    第66回土木学会年次学術講演会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  145. Local strain evaluation of load carrying cruciform joints in low and high cycle fatigue region

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  146. Effective Notch Strainによる溶接継手の低サイクル疲労強度評価

    判治剛,サイプラサートキットカウィン,三木千壽

    第66回土木学会年次学術講演会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  147. Fatigue strength evaluation method for welded joints by new local stress concept International conference

    Kazuo Tateishi, Wataru Naruse, Takeshi Hanji, Isao Ito

    International Conference on Advanced Technology in Experimental Mechanics' 11 

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    Event date: 2011.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  148. Fatigue crack propagation at attachment welded joint International conference

    Kengo Anami et.al.

    11th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  149. Improvement in extremely low cycle fatigue strength of steel bridge piers by weld toe grinding International conference

    Naoki Nagamatsu, Takeshi Hanji, Kazuo Tateishi

    11th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  150. Evaluation of scatter in fatigue life of welded joints by fracture mechanics International conference

    Kazuo Tateishi, Moritaka Yoshida, Takeshi Hanji

    11th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  151. Local stress based fatigue assessment for out-of-plane gusset welded joints International conference

    Sho Sasada, Kazuo Tateishi, Takeshi Hanji

    11th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  152. Fatigue strength of base joints of outrigger bracket in steel bridges International conference

    Shun Ukai, Kazuo Tateishi, Takeshi Hanji, Kenshi Yoshimine

    11th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  153. Fatigue strength assessment of load carrying cruciform joints in low and high cycle fatigue region based on effective notch concept International conference

    Saiprasertkit Kawin, Takeshi Hanji, Chitoshi Miki

    The 64th Annual Assembly of IIW 

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    Event date: 2011.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:India  

  154. Fatigue crack initiation point of load carrying cruciform joints in low cycle fatigue region International conference

    Takeshi Hanji, Saiprasertkit Kawin, Chitoshi Miki

    The 64th Annual Assembly of IIW 

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    Event date: 2011.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:India  

  155. Experimental study of load-carrying cruciform joints containing incomplete penetration and strength under-matching in low and high cycle fatigue regions International conference

    Saiprasertkit Kawin, Takeshi Hanji, Chitoshi Miki

    12th East Asia-Pacific Conference on Structural Engineering and Construction 

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    Event date: 2011.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  156. Effect of strength matching on low cycle fatigue performance of load carrying cruciform joints with weld defects

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  157. 車両の走行性を考慮した免制震デバイスによる既設鋼橋の耐震性能向上

    グェンカックタイン,三木千壽,判治剛,佐伯英一郎

    第65回土木学会年次学術講演会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  158. Seismic retrofit of existing highway steel bridges using devices considering driving safety of vehicles International conference

    Nguyen KacTain, Takeshi Hanji, Chitoshi Miki

    3rd ASIA Conference on Earthquake Engineering 

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    Event date: 2010.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Thailand  

  159. Seismic resistance evaluation of load carrying cruciform welded joints with material matching and incomplete penetration International conference

    Saiprasertkit Kawin, Takeshi Hanji, Chitoshi Miki

    3rd ASIA Conference on Earthquake Engineering 

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    Event date: 2010.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Thailand  

  160. Development of new database of fatigue damage and repairing cases by using editor-friendly platform International conference

    Chitoshi Miki, Keigo Suzuki, Kiyoshi Ono, Takeshi Hanji

    The 63rd Annual Assembly of IIW 

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    Event date: 2010.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  161. Low and high cycle fatigue behavior of load-carrying cruciform welded joints containing incomplete penetration and strength mismatch International conference

    Takeshi Hanji, Chitoshi Miki, Saiprasertkit Kawin

    The 63rd Annual Assembly of IIW 

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    Event date: 2010.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  162. Weld repair for fatigue cracked joints in steel bridges by applying low temperature transformation welding wire International conference

    Chitoshi Miki, Takeshi Hanji, Kohei Tokunaga

    The 63rd Annual Assembly of IIW 

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    Event date: 2010.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  163. 無線センサネットワークによる鋼橋部材の疲労損傷原因の特定の試み

    三木千壽,山口浩,判治剛,田辺篤史

    第56回構造工学シンポジウム 

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    Event date: 2010.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  164. Fatigue behavior of load-carrying cruciform joints with weld defect under cyclic plastic strain International conference

    Takeshi Hanji, Saiprasertkit Kawin, Chitoshi Miki

    7th International Conference on Urban Earthquake Engineering 

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    Event date: 2010.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  165. 止端処理を施した溶接継手の極低サイクル疲労強度推定手法に関する研究

    埴渕脩司,舘石和雄,判治剛

    第64回土木学会年次学術講演会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  166. 溶接止端処理による縦リブ溶接継手の極低サイクル疲労強度向上効果

    坪井龍一,舘石和雄,判治剛

    第64回土木学会年次学術講演会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  167. 鋼製橋脚基部に対する公称ひずみ基準の低サイクル疲労強度曲線の提案

    判治剛,舘石和雄

    第64回土木学会年次学術講演会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  168. A simulation on fatigue crack propagation in welded joints International conference

    Takeshi Hanji, Kazuo Tateishi, Keisuke Tsuchiya

    10th International Conference on Structural Safety and Reliability 

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    Event date: 2009.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  169. Study on structural behavior causing fatigue damage in steel bridge by applying wireless sensor network International conference

    Hiroshi Yamaguchi, Chitoshi Miki, Atsushi Tanabe, Takeshi Hanji

    10th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  170. Fatigue strength of load carrying cruciform joints in beam to column connection of steel bridge piers International conference

    Saiprasertkit Kawin, Chitoshi Miki, Takeshi Hanji

    11th International Summer Symposium, JSCE 

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    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  171. Fatigue strength of load-carrying cruciform joints with incomplete penetration in low- and high-cycle fatigue regions International conference

    Takeshi Hanji, Chitoshi Miki, Saiprasertkit Kawin

    10th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  172. Extremely low cycle fatigue strength of finished welded joint International conference

    Kazuo Tateishi, Takeshi Hanji, Shuji Hanibuchi

    10th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  173. Fatigue crack propagation path in T-shape welded joints subjected to plate bending International conference

    Kazuo Tateishi, Keisuke Tsuchiya, Takeshi Hanji

    10th Japan-Korea Joint Symposium on Steel Bridges 

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    Event date: 2009.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  174. Radiation characteristics of ultrasonic tip echo from fatigue cracks International conference

    Chitoshi Miki, Ryohei Onishi, Takumi Kubota, Takeshi Hanji

    The 62nd Annual Assembly of IIW 

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    Event date: 2009.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  175. A case study of performance based design on low cycle fatigue improvement International conference

    Kazuo Tateishi, Takeshi Hanji, Shuji Hanibuchi

    5th International Symposium on Steel Structures 

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    Event date: 2009.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  176. 鋼プレートガーダー橋の疲労き裂進展シミュレーション

    舘石和雄,谷利晃,判治剛

    鋼構造シンポジウム2008 

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    Event date: 2008.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  177. T字溶接継手に生じる疲労き裂の進展経路に関する検討

    土屋啓佑,舘石和雄,判治剛

    第63回土木学会年次学術講演会 

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    Event date: 2008.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  178. 縦リブ溶接継手の極低サイクル疲労試験と疲労強度予測のための簡易解析法

    判治剛,舘石和雄

    第63回土木学会年次学術講演会 

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    Event date: 2008.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  179. 止端処理による溶接継手の極低サイクル疲労強度向上効果

    埴渕脩司,舘石和雄,判治剛

    第63回土木学会年次学術講演会 

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    Event date: 2008.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  180. Improvement of extremely low cycle fatigue strength of welded joints International conference

    Shuji Hanibuchi, Kazuo Tateishi, Takeshi Hanji

    11th East Asia-Pacific Conference on Structural Engineering and Construction 

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    Event date: 2008.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  181. Extremely low cycle fatigue assessment method for un-stiffened steel pier with box section International conference

    Kazuo Tateishi, Tao Chen, Takeshi Hanji

    11th East Asia-Pacific Conference on Structural Engineering and Construction 

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    Event date: 2008.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  182. A study on fatigue crack propagation path in T shape welded joint International conference

    Keisuke Tsuchiya, Kazuo Tateishi, Takeshi Hanji

    11th East Asia-Pacific Conference on Structural Engineering and Construction 

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    Event date: 2008.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  183. Improvement of extremely low cycle fatigue strength of welded joints by toe finishing International conference

    Kazuo Tateishi, Shuji Hanibuchi, Takeshi Hanji

    The 61st Annual Assembly of IIW 

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    Event date: 2008.7

    Language:English   Presentation type:Oral presentation (general)  

  184. Review of recent bridge asset management systems International conference

    Takeshi Hanji, Kazuo Tateishi

    International Symposium on EcoTopia Science 2007 

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    Event date: 2007.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  185. 溶接継手に生じた疲労き裂の進展経路に関する解析的検討

    舘石和雄,判治剛

    鋼構造シンポジウム2007 

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    Event date: 2007.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  186. A simple low cycle fatigue assessment of welded joint by local strain approach and test verification

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  187. Local strain approach to extremely low cycle fatigue assessment for thick-walled steel pier with box section International conference

    Tao Chen, Kazuo Tateishi, Takeshi Hanji

    9th Korea-Japan Joint Seminar on Steel Bridges 

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    Event date: 2007.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  188. Extremely low cycle fatigue test on un-stiffened steel pier with thick-walled box section International conference

    Takeshi Hanji, Kazuo Tateishi, Tao Chen

    9th Korea-Japan Joint Seminar on Steel Bridges 

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    Event date: 2007.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  189. Low cycle fatigue assessment for welded joints based on local strain approach International conference

    Kazuo Tateishi, Takeshi Hanji, Tao Chen

    The 60th Annual Assembly of IIW 

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    Event date: 2007.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  190. 両振り載荷時の鋼材の極低サイクル疲労強度

    判治剛,舘石和雄,南邦明

    第61回土木学会年次学術講演会 

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    Event date: 2006.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  191. A prediction model for extremely low cycle fatigue strength of structural steel and welded material International conference

    Kazuo Tateishi, Takeshi Hanji

    The 59th Annual Assembly of IIW 

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    Event date: 2006.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  192. TIG処理による極低サイクル疲労強度の向上効果

    鬼頭和也,判治剛,舘石和雄,南邦明

    第60回土木学会年次学術講演会 

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    Event date: 2005.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  193. 局部ひずみによる溶接継手の極低サイクル疲労強度評価

    判治剛,舘石和雄,鬼頭和也,南邦明

    第60回土木学会年次学術講演会 

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    Event date: 2005.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  194. A prediction model for extremely low cycle fatigue life under variable strain amplitude International conference

    Kazuo Tateishi, Takeshi Hanji

    8th Japan-Korea Joint Seminar on Steel Bridges 

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    Event date: 2005.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  195. Extremely low cycle fatigue assessment method for welded joint by peak strain approach International conference

    Takeshi Hanji, Kazuo Tateishi, Kazuya Kitoh

    6th Japanese-German Bridge Symposium 

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    Event date: 2005.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  196. Improvement of extremely low cycle fatigue strength of welded joints by TIG dressing International conference

    Kazuo Tateishi, Takeshi Hanji, Kazuya Kitoh

    6th Japanese-German Bridge Symposium 

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    Event date: 2005.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  197. 溶接部を対象とした極低サイクル疲労強度予測モデル

    舘石和雄,判治剛,鬼頭和也,南邦明

    第51回構造工学シンポジウム 

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    Event date: 2005.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  198. 変動ひずみ振幅下の極低サイクル疲労寿命予測手法

    判治剛,舘石和雄,南邦明

    第59回土木学会年次学術講演会 

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    Event date: 2004.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  199. 大ひずみ領域における溶接部の低サイクル疲労強度

    舘石和雄,判治剛,南邦明

    第59回土木学会年次学術講演会 

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    Event date: 2004.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  200. Low cycle fatigue strength of steel in extreme large strain field International conference

    Kazuo Tateishi, Takeshi Hanji

    3rd International Conference on Earthquake Engineering 

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    Event date: 2004.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  201. Low cycle fatigue testing system by means of image technique and its application to steel welded joints International conference

    Takeshi Hanji, Kazuo Tateishi

    1st International Conference on Advances in Experimental Structural Engineering 

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    Event date: 2004.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  202. Low cycle fatigue strength of welded joints in extreme large strain field International conference

    Kazuo Tateishi, Takeshi Hanji

    2nd International Conference on Bridge Maintenance, Safety, Management and Cost 

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    Event date: 2004.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  203. Application of image analysis to steel structural engineering International conference

    Kazuo Tateishi, Takeshi Hanji

    North American Euro-Pacific Workshop 

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    Event date: 2004

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  204. 突合わせ溶接継手の低サイクル疲労強度

    判治剛,舘石和雄

    第58回土木学会年次学術講演会 

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    Event date: 2003.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  205. 画像計測によるひずみ制御低サイクル疲労試験

    舘石和雄,判治剛

    第58回土木学会年次学術講演会 

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    Event date: 2003.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  206. 3-D shape measurement of corroded surface by using digital stereography International conference

    Takeshi Hanji, Kazuo Tateishi, Kazuki Kitagawa

    1st International Conference on Structural Health Monitoring and Intelligent Infrastructure 

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    Event date: 2003.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  207. Low cycle fatigue testing system by means of image analysis technique International conference

    Takeshi Hanji, Kazuo Tateishi

    7th Korea-Japan Joint Seminar on Steel Bridges 

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    Event date: 2003.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  208. A study on low cycle fatigue strength of butt welded joint by means of image analysis technique International conference

    Kazuo Tateishi, Takeshi Hanji

    5th Japanese-German Joint Symposium on Steel and Composite Bridges 

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    Event date: 2003.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  209. 突合わせ溶接継手の低サイクル疲労強度に関する基礎的研究

    舘石和雄,判治剛

    平成14年度土木学会中部支部研究発表会 

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    Event date: 2003.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  210. ステレオグラフィーによる腐食形状の3次元計測

    舘石和雄,判治剛

    第57回土木学会年次学術講演会 

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    Event date: 2002.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  211. 画像計測による疲労き裂進展速度の推定手法

    舘石和雄,判治剛,山田聡,阿部允

    第56回土木学会年次学術講演会 

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    Event date: 2001.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  212. Estimation method for crack propagation behavior in welded joint International conference

    Kazuo Tateishi, Takeshi Hanji, Makoto Abe

    6th Korea-Japan Joint Seminar on Steel Bridges 

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    Event date: 2001.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  213. 画像計測による疲労き裂進展速度の推定手法

    舘石和雄,判治剛,山田聡,阿部允

    平成12年度土木学会中部支部研究発表会 

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    Event date: 2001.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

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Research Project for Joint Research, Competitive Funding, etc. 13

  1. 局部座屈との連成を考慮した低サイクル疲労設計曲線の提案

    2021.4 - 2022.3

    日本鉄鋼連盟 鋼構造研究・教育助成制度 

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    Authorship:Principal investigator  Grant type:Competitive

  2. 圧縮残留応力の局所的付与による既設鋼部材の予防保全技術に関する研究

    2019.4 - 2021.3

    日本鉄鋼連盟 鋼構造研究・教育助成制度 

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    Authorship:Principal investigator  Grant type:Competitive

  3. ホットスポット応力を用いた疲労強度評価法における応力算出法の合理化

    2019.4 - 2020.3

    日本溶接協会 2019年度 次世代を担う研究者助成事業 

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    Authorship:Principal investigator  Grant type:Competitive

  4. 鋼トラス橋の低サイクル疲労破壊の予測とその防⽌対策に関する研究

    2018.4 - 2019.3

    日本鉄鋼連盟 鋼構造研究・教育助成制度 

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    Authorship:Principal investigator  Grant type:Competitive

  5. 溶接不溶着部を起点とする低サイクル疲労破壊メカニズムの解明とその予測法の開発

    2017.4 - 2018.3

    日本溶接協会 平成29(2017)年度 次世代を担う研究者助成事業 

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    Authorship:Principal investigator  Grant type:Competitive

  6. 疲労損傷を受けた鋼構造部材の溶接による再生技術に関する研究

    2016.4 - 2017.3

    日本鉄鋼連盟 鋼構造研究・教育助成制度 

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    Authorship:Principal investigator  Grant type:Competitive

  7. 長時間継続地震動下での土木鋼構造物の低サイクル疲労に関する研究

    2012.11 - 2014.3

    日本橋梁建設協会 鋼橋に関わる各種の防災技術に関する研究助成 

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    Authorship:Principal investigator  Grant type:Competitive

  8. 疲労き裂の補修技術に関する研究開発

    2012.4 - 2015.3

    道路政策の質の向上に資する技術研究開発 

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  9. 鋼橋に生じた疲労損傷に対する溶接補修技術の開発

    2011.6 - 2012.3

    海洋架橋・橋梁調査会 橋梁技術に関する研究開発助成 

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    Authorship:Principal investigator  Grant type:Competitive

  10. 高い疲労耐久性を有する横リブスリット構造に関する研究

    2011.4 - 2020.3

    日本橋梁建設協会 研究助成 

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    Authorship:Principal investigator  Grant type:Competitive

  11. 鋼構造部材における地震時のき裂進展メカニズムの解明とその予測手法の開発

    2011.4 - 2012.3

    日本鉄鋼連盟 鋼構造研究・教育助成制度 

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    Authorship:Principal investigator  Grant type:Competitive

  12. 橋梁用高性能鋼の耐脆性破壊特性とそれを適用した構造部材の限界き裂長に関する研究

    2010.4 - 2011.3

    日本鉄鋼連盟 鋼構造研究・教育助成制度 

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    Authorship:Principal investigator  Grant type:Competitive

  13. 溶接継手に対する低サイクル疲労強度等級分類の確立のための基礎的研究

    2008.4 - 2009.3

    日本鋼構造協会 鋼構造研究助成 

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    Authorship:Principal investigator  Grant type:Competitive

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KAKENHI (Grants-in-Aid for Scientific Research) 7

  1. ホットスポット型疲労評価における合理的応力算出法の探究

    Grant number:21K04233  2021.4 - 2024.3

    科学研究費補助金  基盤研究(C)

    判治 剛

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    Authorship:Principal investigator 

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    100年鋼橋の実現にむけて,合理的かつ戦略的に維持管理を行うためには,鋼部材の疲労を適切に評価することが重要である.鋼橋に生じる疲労き裂は,橋梁がシステムとして立体的に挙動することによる二次応力に起因するものがほとんどあり,それを従来の公称応力に基づく方法で評価することは難しい.橋梁の立体挙動の影響を直接とりこむことができる方法としてホットスポット応力法がある.ホットスポット応力は,30年近く前に提唱された概念ではあるが,依然として完成された手法とはいいがたく,その精緻化が本研究の目的である.本研究は,板厚や面外曲げの影響,板側面のき裂への適用性,疲労限の考え方などについて,疲労試験と有限要素解析による結果を関連付けて整理し,得られた成果と過去の知見を基に,合理的かつ実用的なホットスポット応力算出法を提示するものである.

  2. Development of maintenance method for steel bridges based on fatigue crack growth behavior

    Grant number:18H01520  2018.4 - 2021.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research(B)

    Hanji Takeshi

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    Authorship:Principal investigator 

    Grant amount:\13910000 ( Direct Cost: \10700000 、 Indirect Cost:\3210000 )

  3. Proposal of low cycle fatigue design curves for steel members in civil structures

    Grant number:16K18139  2016.4 - 2018.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists(B)

    Hanji Takeshi

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    Authorship:Principal investigator 

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    This study newly proposed a low cycle assessment method for steel members, where fatigue life of the member can be predicted by nominal strains calculated with a beam element analysis. To establish the assessment method, the local strain amplitude at a weld toe that is a potential cracking point was firstly correlated with the nominal strain amplitude that is not affected by strain concentration due to weld and joint configurations. The former strain can be obtained by an analysis with solid elements and the latter strain can be obtained with a beam element analysis conventionally used in seismic design. Then, based on the correlation, the nominal strain based fatigue strength curves for base joints in steel piers were derived from the local strain based fatigue strength curves previously proposed for steel materials. Besides, the obtained fatigue strength curves were verified with several low cycle fatigue tests in this study and also in the previous research.

  4. 鋼橋の長寿命化に向けた溶接継手の超高サイクル疲労強度評価技術の開発

    2012.4 - 2014.3

    科学研究費補助金 

    判治 剛

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    Authorship:Principal investigator 

    現在,「橋梁長寿命化・寿命100年以上」が強く求められている.寿命100年以上を実現するためには膨大な回数の外力の繰り返しに耐えなければならず,従来の想定を超えた寿命領域での疲労損傷に対する配慮が不可欠となる.そこで本研究では,これまで想定されてきた疲労寿命より1オーダー多い寿命域である「超高サイクル疲労域」(107回以上)を対象とし,その領域での溶接継手の疲労強度評価技術を開発する.超高サイクル疲労域の実験では載荷回数の増加に伴う試験の長期化がネックとなるが,本研究では超高速で載荷可能な振動式試験機を新たに構築し,実験時間の問題を解決する.得られた結果より,超高サイクル疲労域における溶接継手の疲労破壊機構を明らかにし,超高サイクル疲労域までカバーした疲労設計法を提案する.

  5. Estimation of Residual Life of Fatigue Cracked Steel Bridge Members

    2010.4 - 2013.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research(B)

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    Authorship:Coinvestigator(s) 

  6. コンクリートを充填した鋼構造部材の低サイクル疲労破壊特性の解明

    2010.4 - 2012.3

    科学研究費補助金  若手研究(B)

    判治 剛

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    阪神・淡路大震災において明らかとなった土木鋼構造部材の低サイクル疲労破壊に着目し,昨今広く普及しつつあるコンクリート充填鋼部材に対する低サイクル疲労照査法を開発することを目的とする.き裂発生箇所の塑性ひずみ履歴に基づいたき裂発生条件を明らかにし,簡易な照査式を提案する.さらに,開発した低サイクル疲労照査式と局部座屈に対してすでに提案されている強度予測式を組み合わせ,低サイクル疲労破壊と局部座屈の両面から評価できる合理的な耐震照査法を確立する.

  7. 土木鋼構造部材の低サイクル疲労設計手法の開発

    2005.4 - 2006.3

    科学研究費補助金  科学研究費補助金(特別研究員奨励費)

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    Authorship:Principal investigator 

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