Faculty Profiles - SHIMIZU Masaru

Papers - SHIMIZU Masaru

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

Cut, A. P, Tateishi, K, Hanji, T, Shimizu, M

Proceedings of the 12th Pacific Structural Steel Conference page： CD-ROM 2019

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

Hanji T., Tateishi K., Shimizu M., Uchida D., Kimura R., Asano K.

Welding International Vol. 33 ( 4-6 ) page： 123 - 134 2019

Publisher：Welding International

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： 10.1080/09507116.2020.1860379

Scopus

Fatigue strength of laser-arc hybrid welded joints with tack welds Open Access

HANJI Takeshi, TATEISHI Kazuo, SHIMIZU Masaru, UCHIDA Daisuke, KIMURA Ryosuke, ASANO Koichi

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 37 ( 3 ) page： 99 - 107 2019

Language：Japanese Publisher：JAPAN WELDING SOCIETY

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

Open Access

Scopus

CiNii Research

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 Reviewed

清川昇悟，判治剛，清水優，舘石和雄

鋼構造年次論文報告集 Vol. 第26巻 page： pp.277-283 2018.11

腐食した鉄筋の疲労寿命予測 Reviewed

判治剛，アフマドザイニアマチュラ，舘石和雄，清水優

鋼構造年次論文報告集 Vol. 第26巻 page： pp.804-810 2018.11

Effect of Weld Penetration on Low Cycle Fatigue Strength of Load-Carrying Cruciform Joints Reviewed

Hanji T., Tateishi K., Ohashi Y. and Shimizu M.

The 71st Annual Assembly of International Institute of Welding Vol. XIII-2749-18 page： pp.219-229 2018.7

A PREDICTION METHOD OF LOCAL STRAIN RANGE AT WELD TOE OF VARIOUS JOINTS Open Access

SHIMIZU Masaru, TATEISHI Kazuo, HANJI Takeshi, HONDA Naoya

Kou kouzou rombunshuu Vol. 25 ( 97 ) page： 97_61 - 97_66 2018.3

Language：Japanese Publisher：Japanese Society of Steel Construction

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

Open Access

CiNii Research

ICR処理による鋼橋の疲労寿命の延命化 Open Access

清水優，石川敏之

溶接学会誌 Vol. 第87巻 ( 第4号 ) page： pp. 2018

レーザ・アークハイブリッド溶接を用いた十字継手の疲労強度 Reviewed Open Access

判治剛，舘石和雄，清水優，内田大介，木村陵介，浅野浩一

溶接学会論文集 Vol. Vol.36 ( Issue 4 ) page： pp.219-229 2018

Fatigue Cracks in I-Beam End in Railway Steel Bridges and Its Life Extension by Stop-Hole Repair Reviewed Open Access

Hanji T., Tateishi K., Shimizu M., Iwai M., Ikegashira K. and Niwa Y.

Journal of Structural Engineering Vol. Vol.74A ( No.2 ) page： pp.290-305 2018

A Prediction Method of Local Strain Range at Weld Toe of Various Joints Reviewed Open Access

Shimizu M., Tateishi K., Hanji T. and Honda N.

Steel Construction Engineering (Note) Vol. 第25管 ( 97号 ) page： pp.61-66 2018

A Prediction Method of Local Strain Range at Weld Toe of Various Joints Reviewed Open Access

Kiyokawa S., Tateishi K., Hanji T. and Shimizu M.

Journal of Structural Engineering Vol. Vol.64A page： pp.445-454 2018

Reduction of Stress Concentration at Drilled Hole Due to Adding Splice Plates Reviewed Open Access

Kiyokawa S., Tateishi K., Hanji T. and Shimizu M.

Journal of Structural Engineering Vol. Vol.64A page： pp.435-444 2018

Fatigue Cracks in I-Beam End in Railway Steel Bridges and Its Life Extension by Stop-Hole Repair Reviewed Open Access

Hanji T., Tateishi K., Shimizu M., Iwai M., Ikegashira K. and Niwa Y.

Journal of Structural Engineering Vol. Vol.74A ( No.2 ) page： pp.290-305 2018

Reduction of stress concentration at drilled hole due to adding splice plates Open Access

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

Journal of Structural Engineering, A Vol. 64A ( 0 ) page： 435 - 444 2018

Language：Japanese Publisher：Japan Society of Civil Engineers

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 plate’s 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

Open Access

CiNii Research

Fatigue strength of cruciform joints with laser-arc hybrid welding Open Access

HANJI Takeshi, TATEISHI Kazuo, SHIMIZU Masaru, UCHIDA Daisuke, KIMURA Ryosuke, ASANO Koichi

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 36 ( 4 ) page： 219 - 229 2018

Language：Japanese Publisher：JAPAN WELDING SOCIETY

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

Open Access

Scopus

CiNii Research

Fatigue Life Extension of Steel Bridge by ICR Treatment Open Access

SHIMIZU Masaru, ISHIKAWA Toshiyuki

JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 87 ( 4 ) page： 252 - 256 2018

Repair of fatigue crack in steel bridge by ICR treatment Open Access

Yousetsu Gakkai

Preprints of the National Meeting of JWS Vol. 2018f ( 0 ) page： 288 - 289 2018

CRACK SIZING ACCURACY OF A PHASED ARRAY ULTRASONIC SCANNER DEVELOPED FOR INSPECTION OF RIB-TO-DECK WELDED JOINTS IN ORTHOTROPIC STEEL DECKS Open Access

HATTORI Masafumi, MAKITA Tohru, TATEISHI Kazuo, HANJI Takeshi, SHIMIZU Masaru, YAGI Naoto

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) Vol. 74 ( 3 ) page： 516 - 530 2018

Language：Japanese Publisher：Japan Society of Civil Engineers

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 determined 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

Open Access

CiNii Research

FATIGUE CRACKS IN I-BEAM END IN RAILWAY STEEL BRIDGES AND ITS LIFE EXTENSION BY STOP-HOLE REPAIR Open Access

HANJI Takeshi, TATEISHI Kazuo, SHIMIZU Masaru, IWAI Masaki, IKEGASHIRA Ken, NIWA Yuichiro

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) Vol. 74 ( 2 ) page： 290 - 305 2018

Language：Japanese Publisher：Japan Society of Civil Engineers

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 countermeasure, the crack is typically repaired with a drilling hole at its tip, 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, the life extension of cracked I-beams by applying a stop-hole was investigated through fatigue tests using an actual I-beam bridge removed from the field. And also, in order to make sure local stress distribution around the stop-hole in the test, finite element analyses were 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, it was revealed that the maximum stress along a stop-hole tends to decrease as a crack becomes long, meaning that the effect of the stop-hole varies depending on crack length.

DOI： 10.2208/jscejseee.74.290

Open Access

CiNii Research

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Papers - SHIMIZU Masaru