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结构体系的模糊可靠度评估是工程中倍受关注的重要问题,而主要失效模式的识别及对应极限状态方程的建立是结构体系模糊可靠度分析的关键。该文将模糊数学理论与可靠性分析相结合,对概率模型含模糊分布参数时的结构体系模糊可靠度进行分析,在失效模式不相关和相关两种情况下分别建立了相应的结构体系模糊失效概率计算模型。所提出的含模糊分布参数的结构体系失效模式的枚举准则,可在只需枚举出少量主失效模式的条件下,不漏掉最危险失效模式。算例分析表明该方法是有效和可行的。
The fuzzy reliability assessment of structural system is an important issue in engineering. However, the identification of the main failure modes and the establishment of corresponding limit state equations are the key points in the fuzzy reliability analysis of structural system. In this paper, fuzzy mathematics theory and reliability analysis are combined to analyze the fuzzy reliability of structural system when the probability model contains fuzzy distribution parameters. In the case of irrelevant failure mode and correlation, the corresponding fuzzy failure of the structural system is established respectively Probability calculation model. The proposed enumeration criterion for failure modes of structural systems with fuzzy distribution parameters can not miss the most dangerous failure modes under the condition of enumerating only a few main failure modes. The example analysis shows that this method is effective and feasible.