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Steel and Composite Structures Volume 53, Number 2, October 25 2024 , pages 145-153 DOI: https://doi.org/10.12989/scs.2024.53.2.145 |
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System reliability assessment of hanger structure considering corrosion-fatigue coupling effect |
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Yang Ding, Chao-Dong Guan, Jian Zhou, Tian-Yun Chu and Xue-Song Zhang
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| Abstract | ||
| The bridge hanger is exposed to cyclic loads, such as wind and vehicle loads, which can induce fatigue failure, significantly reducing its operational lifespan. Additionally, the hanger is prone to corrosion throughout transportation, construction, and operation. Although corrosion fatigue curves are typically derived from individual steel wire experiments, the bridge hanger comprises multiple parallel steel wires. Consequently, a corrosion fatigue curve based on a single wire may not accurately portray the hanger'slongevity, and data solely at the component level may not encompass the overall system-level condition. To tackle this challenge, this paper introduces a series system-level reliability assessment framework based on dynamic Bayesian Networks, accounting for the interdependence between variables. Specifically, the framework encompasses a time-varying reliability model featuring three random parameters (corroded number, equivalent structural stress, and the total cycles number of wires) and leverages seven numerical simulation studies to investigate the impacts of these random parameters on system reliability. | ||
| Key Words | ||
| corrosion fatigue; dynamic bayesian network; parallel steel wire; S-N curve; series system; system-level assessment reliability | ||
| Address | ||
| Yang Ding:1)Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology, Chang'an University, Xi'an 710064, China 2)Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, China 3)State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China Chao-Dong Guan:Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, China Jian Zhou:Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, China Tian-Yun Chu:Jiaxing Tiankun Construction Engineering Design Co., Ltd., Jiaxing 314000, China Xue-Song Zhang:State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China | ||