Faculty Profiles - SHIMIZU Masaru

Papers - SHIMIZU Masaru

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Failure Probability for Fatigue Crack in Web Plate of Bridge Girder Reviewed International coauthorship

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

INTERNATIONAL JOURNAL OF STEEL STRUCTURES Vol. 22 ( 1 ) page： 42 - 55 2022.2

Study on Fatigue Durability of Steel Box Girder Corner Plate Weld with Peening Reviewed

Takamitsu Nishishiba, Yoshihiko Takada, Misa Kumazawa, Ryoji Okamoto, Kazuo Tateishi, Shimizu Masaru

Conference: IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures page： 783 - 791 2022.1

FATIGUE EVALUATION FOR ROOT CRACKS IN U-RIB TO DECK WELDED JOINTS OF ORTHOTROPIC STEEL DECKS BASED ON FIELD MEASUREMENTS Open Access

HATTORI Masafumi, TATEISHI Kazuo, HANJI Takeshi, SHIMIZU Masaru

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) Vol. 78 ( 2 ) page： 287 - 300 2022

Language：Japanese Publisher：Japan Society of Civil Engineers

This paper examines application of a fatigue evaluation method for the cracks in the weld joints between a U-rib and a deck plate in orthotropic steel bridge decks. Field measurements were conducted in two sections with different crack initiation trends, and a method was proposed to obtain the cumulative fatigue damage ratio from the measurement results and routinely obtained data such as temperature and traffic volume. In addition, the validity of the evaluation of crack initiation and propagation direction by the developed evaluation method is verified by comparing with the actual crack situation, and a method to screen out the priority inspection and investigation area is proposed.

DOI： 10.2208/jscejseee.78.2_287

Open Access

CiNii Research

Study on Fatigue Durability of Steel Box Girder Corner Plate Weld with Peening

Nishishiba T., Takada Y., Kumazawa M., Okamoto R., Tateishi K., Shimizu M.

IABSE Symposium Prague 2022 Challenges for Existing and Oncoming Structures Report page： 783 - 791 2022

Publisher：IABSE Symposium Prague 2022 Challenges for Existing and Oncoming Structures Report

Corner plates are sometimes added to the web-to-flange joints of box girder bridges by welding on a single side to increase stiffness. In the case of the Minatogawa Bridge on the Hanshin Expressway, a steel box girder with low girder height and corner plate was used to reduce the weight of the superstructure. In this bridge, many fatigue cracks were observed in the welds of the corner plates. As a crack suppression measure, the end of corner plate was cut-out in U-shape. Although the stress concentration relaxation reduced the risk of crack initiation, the risk of crack initiation starting from the un-welded area still remains. In this study, we focused on peening as a countermeasure to improve the fatigue endurance. As a result, it was confirmed that peening to the un-welded area was effective in improving the fatigue endurance.

DOI： 10.2749/prague.2022.0783

Scopus

Residual stress and fatigue strength of longitudinal attachment joints improved by HFMI treatment under static load Open Access

Hanji Takeshi, Kano Suguru, Tateishi Kazuo, Shimizu Masaru

Journal of Structural Engineering, A Vol. 68A ( 0 ) page： 591 - 602 2022

Language：Japanese Publisher：Japan Society of Civil Engineers

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. Longitudinal attachment 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 indicated that enhanced 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 a treatment process indicated that the magnitude of compressive residual stress introduced to a weld toe is similar regardless of the stress state in the joint during treatment.

DOI： 10.11532/structcivil.68a.591

Open Access

CiNii Research

RETARDATION OF FATIGUE CRACK GROWTH BY CORROSION ACCELERATOR INJECTION Open Access

PUTRI Cut Atika, TATEISHI Kazuo, SHIMIZU Masaru, HANJI Takeshi

Kou kouzou rombunshuu Vol. 28 ( 112 ) page： 112_111 - 112_116 2021.12

Language：English Publisher：Japanese Society of Steel Construction

In this study, fatigue crack growth was retarded by injecting corrosion accelerator, Nitric acid (HNO3), into the crack to induce corrosion. The presence of the corrosion products is expected to reduce the crack opening width and act as a wedge to control the crack closure. Fatigue tests were carried out on the compact tension (CT) specimens. The test revealed that the corrosion process due to HNO3 injection ends after 24 hours. Then, the reduction in crack opening displacement range can be observed. Retardation in the crack growth was observed regardless of the load range and the effective stress intensity factor range (ΔKeff) at injection. Meanwhile, the retardation level tends to be affected by the ΔKeff and crack length at injection.

DOI： 10.11273/jssc.28.112_111

Open Access

CiNii Research

Influence of Weld Toe Radius on Low Cycle Fatigue Life of Weld Joint in Shear Panel Damper Reviewed

Kai Hiroyama, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Yasumoto Aoki

Proceedings of 11th International Symposium on Steel Structures page： 140 - 143 2021.11

Fatigue Evaluation of Cut-out at the Edge of Corner Plate and Improvement Effect by Peening Reviewed

Masaru Shimizu, Kazuo Tateishi, Takeshi Hanji, Shinta Ayuningtyas, Misa Fujibayashi

Proceedings of 11th International Symposium on Steel Structures page： 136 - 139 2021.11

Mechanical Behavior and Limit States of Combination Joints using Rivets and High-Strength Bolts Reviewed

Shunya Sumi, Takeshi Hanji , Kazuo Tateishi, Masaru Shimizu, Yasushi Nagasaka, Toshio Takebuchi

Proceedings of 11th International Symposium on Steel Structures page： 20 - 23 2021.11

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

Proceedings of 11th International Symposium on Steel Structures page： 24 - 27 2021.11

Fatigue Improvement for Weld Joint between Deck Plate and Vertical Stiffener by Slit-Shaped Notch Reviewed

Daisuke Kaneko, Kazuo Tateishi, Takeshi Hanji, Masaru Shimizu, Hiroki Suetsugu

Proceedings of 11th International Symposium on Steel Structures page： 79 - 82 2021.11

Low Cycle Fatigue Crack Growth Rate Testing with Compliance Method and Its Application to Different Structural Steels Reviewed

Chao Jiang, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu

Proceedings of 11th International Symposium on Steel Structures page： 128 - 131 2021.11

Mechanical Behavior and Limit States of Combination Joints using Rivets and High-Strength Bolts Reviewed

Shunya Sumi, Takeshi Hanji, Kazuo Tateishi, Masaru Shimizu, Yasushi Nagasaka, Toshio Takebuchi