PSI - Issue 68

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 68 (2025) 415–419

European Conference on Fracture 2024 Improvement In Fatigue Properties Of Welded Joints Using Crack Initiation Resistant Steel Part2:Fatigue Crack Initiation Life Of Rib To-Deck Welded Joints Of Orthotropic Steel Bridge Decks Akito Tabata a, *, Masahiro Matsushita a , Tetsuo Yamaguchi a , Yasuhito Takashima b , Toshiyuki Ishikawa c Abstract Fatigue durability is one of the problems in the maintenance of bridges. One of the areas of concern for fatigue crack initiation, the weld between the U-shaped rib and the deck of Orthotropic Steel Decks is known. The fatigue crack initiation life of a rib - to - deck welded joints was investigated using a developed steel with high crack initiation resistance. As a result, when the developed steel was used for the deck, the crack initiation life was prolonged by about 1.5 times compared with the case where the conventional steel was applied. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers a Kobe steel Ltd., Steel & Aluminum Business,2222-1 Ikeda, Onoe-cho, Kakogawa, Hyogo, Japan b Kobe steel Ltd., Technical Development Group,1-5-5 Takatsukadai, Nishi-ku, Kobe, Hyogo, Japan c Kansai University, Faculty of Environmental and Urban Engineering, 3-3-35 Yamate-tyo, Suita, Osaka, Japan

Peer-review under responsibility of ECF24 organizers Keywords: Type your keywords here, separated by semicolons ;

1. Introduction Orthotropic steel decks (OSDs) with U-shaped rib (U-rib) have been widely used in long-span bridges and urban expressways due to their advantages of being lightweight and allowing rapid construction. However, many fatigue cracks propagating from the weld root to the deck plate (crack through deck plate thickness) and to the weld bead

* Corresponding author. Tel.: +81-79-427-5072 E-mail address: tabata.akito@kobelco.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers 10.1016/j.prostr.2025.06.075