【摘要】 寻找主要失效模式是结构系统可靠性分析十分重要而又非常困难的工作.该文对提高大型结构系统可靠性分析时寻找主要失效模式方法的效率问题进行了研究.在分枝限界法的基础上,根据失效路径的失效概率对系统失效概率贡献的大小来判断失效路径是否是主要失效模式的方法.使主要失效模式的判别效率与准确程度大幅度提高,通过例题证明了该方法的有效性.该研究为实现大型实际结构的可靠性分析奠定了一个良好的基础.更多还原

【Abstract】 It is important yet difficult to identify the dominant failure path for reliability analyses of a structural system. Therefore, method to increase the efficiency of identifying dominant failure paths was considered.According to probabilities of the failure paths redound to probability of failure of the structural system, the most significant failure paths was determined on the basis of the branch_and_bound method. A set of examples are introduced to show that this method is highly efficient and more precise and can be applied in reliability analyses of an actual large real system.更多还原