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主要失效模式的识别是结构体系可靠度分析的难点和关键。该文首先综述了主要失效模式识别的国内外研究现状及存在的缺陷;然后针对传统失效模式识别方法主要依靠工程经验确定约界阈值、难以兼顾计算效率和计算精度的问题,介绍了一种结构体系可靠度分析的自适应动态约界法;同时,针对传统失效模式识别方法的路径依赖性所带来的计算量大、识别效率不高等缺陷,介绍了一种结构体系可靠度分析的无路径依赖性方法;最后通过算例分析,验证了这两种方法的有效性和适用性。
The identification of the main failure mode is the crux and key of structural system reliability analysis. In this paper, firstly, the current research status and the existing defects of the main failure mode identification are reviewed. Then, in view of the fact that the traditional failure mode identification method relies mainly on the engineering experience to determine the approximate threshold, it is difficult to balance the computational efficiency with the computational accuracy. At the same time, aiming at the defect of large computational load and low recognition efficiency caused by the path dependence of the traditional failure mode identification methods, a new method for path analysis of structural system reliability is introduced. At last, the validity and applicability of these two methods are verified by the example analysis.