枚举结构主要失效模式的一种方法

由于各失效模式发生的概率不同,在实用中只需挑选出那些发生概率较大的模式——主要失效模式,并将它们对系统失效的影响加以综合就足以较准确地估算出结构系统总的失效概率。因而,有效地识别主要失效模式就成为结构系统可靠性分析和设计中的一个核心问题。本文在优化准则法的基础上,提出了自动生成结构系统主要失效模式的载荷

A METHOD FOR IDENTIFYING SIGNIFICANT FAILURE MODES OF A STRUCTURAL SYSTEM

In this paper, Minimum Incremental Loading Criterion for identifying significant failure modes of a structural system is suggested on the pase of optimality criterion Method presented by Y.S. Feng. In any stage of structural system failure history, the present criterion not only accounts for the actual stresses in elements of structural system but also try to make the incremental loads crresponding to the current stage minimized by selecting appropriate failure elements, which are to enter significant failure modes. The criterion suggested by this paper is ofcapability of effectively identifying significant failure modes of a structural system, because it accounts for the actual failure state and failure history of a structural system. The validity of the proposed criterion is demonstrated by numerical example.