Collapse Pattern Identification for Cable-stayed Bridges Based on Ultimate Limit Analysis
A method based on ultimate limit analysis (ULA) was proposed to identify collapse pattern for cablestayed bridges. The proposed method had no need to model the whole process of structural progressive failure, but assumed plastic hinge model of cablestayed bridges, which had two sets of variables describing plastic hinges positions and rotational angles. By a two-stage sequential optimization, the variables could be solved to reveal the bridge collapse pattern. Parametric studies could be further conducted to identify the bridge critical components, and explore the effects of some design parameters on collapse pattern and ultimate load-carrying capacity (ULC). The proposed technique was illustrated on a twin-pylon cable-stayed bridge. Comparing with the results of nonlinear finite element analysis (FEA), the yielded components forming collapse pattern can be correctly extracted from the plastic hinge model. This technique results in small errors (less than 3.1％) for estimating the ULCs.
Collapse pattern Cable-stayed bridge Ultimate limit analysis Ultimate load-carrying capacity
Dong Yan
Research Institute of Highway Ministry of Transport, 8 Xitucheng Road, Beijing, 100088, China
国际会议
上海
英文
1149-1158
2011-10-21（万方平台首次上网日期，不代表论文的发表时间）