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RISS 인기검색어
- 검색키워드
- 저자 : Masafumi Hattori (검색결과 1 건)
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Effect of UHPFRC Overlay on Fatigue Cracks Propagating from U-rib Welds of Orthotropic Steel Decks
Masafumi Hattori,Kazuo Tateishi,Takeshi Hanji,Masaru Shimizu 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.6
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. 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 eff ect of a countermeasure that uses overlaying Ultra-High Performance Fiber Reinforced cement-based Composites (UHPFRCs) on steel decks with cracks from U-rib welds, and confi rms the fatigue durability of this method. Specifi cally, the retardation of crack propagation and the fatigue durability of the UHPFRC itself as well as the interface between the UHPFRC and the deck plate were confi rmed by a wheel running test and fi nite element analysis. Based on the results, it was clarifi ed that this countermeasure has a positive eff ect on retarding further crack propagation compared with the method of overlaying steel fi ber reinforced concrete, which is generally adopted. In addition, it was revealed that the studied countermeasure has suffi cient fatigue durability.
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