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大跨度斜拉桥由于存在众多不同的失效模式,导致其体系可靠度分析比较困难。但在众多失效模式中,仅有主要的失效模式对整个结构系统的失效概率起决定性作用。β约界法是体系可靠度分析中一种简单而精确的用于搜索主要失效模拟的方法。在β约界法搜索失效模式的过程中,需计算各个单元的可靠度指标。基于有限元的可靠度分析方法是一种高效和精确的可靠度计算方法,用该法研究了一座大跨度斜拉桥的体系可靠度问题。分析结果表明索的失效在整个斜拉桥的失效中起关键作用。
Due to the existence of many different failure modes of long-span cable-stayed bridges, reliability analysis of the system is difficult. However, among the many failure modes, only the main failure modes play a decisive role in the failure probability of the entire structural system. The β-bounding method is a simple and accurate method for searching for the main failure simulation in the system reliability analysis. In the process of searching the failure mode by β-bounding method, the reliability index of each unit needs to be calculated. The reliability analysis method based on finite element method is an efficient and accurate method for calculating the reliability. The reliability of the system for a long-span cable-stayed bridge is studied by this method. The analysis shows that the cable failure plays a key role in the failure of the entire cable-stayed bridge.