Procedure for Computing the Possibility and Fuzzy Probability of Failure of Structures
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摘要: 依据模糊可能性理论,系统地建立含模糊变量时结构的可靠性计算模型。旨在解决模糊结构、模糊-随机结构和模糊状态假设下结构的可靠性计算问题。所建模型可给出模糊结构失效的可能度和模糊-随机结构失效概率的可能性分布。研究表明:对同时含模糊变量和随机变量的混合可靠性计算问题,把失效概率(或可靠度)作为模糊变量,能更客观地反映系统的安全状况。算例分析说明了文中方法的合理性和有效性。Abstract: Traditionally, the calculation of reliability of fuzzy random structures is based on the wellknown formulation of probability of fuzzy events.But sometimes the results of this formulation willnot indicating the real state of safety of fuzzy-random structures.Based on the possibility theory, a computational procedure for the reliability analysis of fuzzy failure problems and random-fuzzy failure problems of mechanical structures that contain fuzzy variables were presented .A procedure for the analysis of structural reliability of problems of fuzzy failure criterion was also proposed.The failure possibility of fuzzy structures and possibility distribution of the probability of failure of fuzzy-random structures can be given by the proposed methods.It is shown that for the hybrid probabilistic and fuzzy reliability problems, the probability of failure should be suitably taken as a fuzzy variable in order to indicate the real safety of system objectively.Two examples illustrate the validity and rationality of the proposed methods.
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Key words:
- structural reliability /
- possibility /
- fuzzy variable /
- fuzzy probability
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