Timedependent system reliability assessment of existingmultibeam RC simply supported bridges(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年2期
- Page:
- 83-89
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Timedependent system reliability assessment of existingmultibeam RC simply supported bridges
- Author(s):
- WANG Xiaoming1; DUAN Ruifang2; BAI Yunteng3; TIAN Jianhui2
- (1. Engineering Research Center for Large Highway Structure Safety, Changan University, Xian 710064,Shaanxi, China; 2. School of Highway and Railway Engineering, Shaanxi College of Communication Technology,Xian 710018, Shaanxi, China; 3. School of Highway, Changan University, Xian 710064, Shaanxi, China)
- Keywords:
- bridge engineering; existing beam bridge; multibeam simply supported bridge; reinforcement concrete; timedependent system reliability assessment
- PACS:
- -
- DOI:
- -
- Abstract:
- To scientifically evaluate the structural performance of multibeam simply supported bridges in service, the redundancy of system bearing, in view of the randomness and timevarying of system failure, and the randomness of system timevarying, timevarying reliability evaluation model was established. Through accident investigation and conceptual analysis, the characteristics and attributes of failure mode and failure mechanism were systematically studied. A set of quantitative analysis methods and indicators were proposed for multibeam bending failure mode. According to the bearing characteristics of the simply supported bridge, the failure mode analysis model considering multiple failure mechanisms were established. According to the bearing capacity characteristics of the multibeam system, the failure probability expression of the system was derived with or without the horizontal connection. Based on the full probability formula, the timevarying reliability evaluation model under multiple failure mechanism was proposed, the contribution rate indicators of different failure modes were proposed. The results show that the most unfavorable component evaluation and the traditional system evaluation model may not make a comprehensive investigation of the structural force transmission mechanism and the interaction of each component and its changes, which may make a conservative or dangerous misjudgment to the structural safety. The model can accurately reflects the law of reliability degradation of structural bearing performance from the system level, considering both the randomness and timevarying of system failure, and the randomness of structural connectivity changes caused by the degradation of horizontal connectivity. 1 tab, 6 figs, 26 refs.
Last Update: 2020-04-09