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Wang, Ping; Pei, Xianjun; Dong, Pingsha; Song, Shaopin
International journal of fatigue, August 2019, 2019-08-00, 20190801, Volume: 125Journal Article
•A traction structural stress method is applied for fatigue analysis of OSD bridge.•Full-scale experimental data from independent research groups are studied.•The predicted fatigue lives match well with experimentally obtained fatigue lives.•The predicted failure modes agree well with the experimental results.•The results show that weld penetration affects fatigue failure mode. In this study, a traction stress method is adopted for analyzing some of the unique fatigue behaviors observed in a series of recent experimental studies on rib-to-deck joints in orthotropic steel bridge decks. It is found that the traction-based structural stress definition is not only effective for describing the relevant stress state responsible for each of the four fatigue failure modes, but also mesh-insensitive in finite element computation. The latter attribute is essential for achieving a reliable evaluation of the most likely failure mode possible out of four typical failure modes for a given joint design (including exact weld dimensions) under specified loading conditions. As such, effective means of avoiding undesirable failure mode, e.g., Type 4 (i.e., weld root cracking), can be examined, e.g., by increasing either weld fillet size and/or weld penetration. Furthermore, the rib-to-deck joint fatigue test data investigated in this study are shown falling within the scatter band of the traction stress based master S-N curve adopted by ASME Div Code since 2007, implying that data transferability exists among these three sets of test data obtained independently by different laboratories.
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