结构体系随机模糊失效模式的确定方法  

A Method for Enumerating Significant General Failure Modes of Structural System

作　　者：吕震宙[1] 岳珠峰[1] 

机构地区：[1]西北工业大学飞机工程系,陕西西安710072

出　　处：《西北工业大学学报》2000年第2期186-189,共4页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金资助! ( 595750 4 0 ;597750 3 2)

摘　　要：定义结构在考虑随机与模糊两种不确定性因素时的失效模式为广义失效模式 ,研究了描述基本变量的随机和模糊性的各种参数对模式失效概率的影响 ,以及描述安全与失效模糊状态的各种参数对模式失效概率的影响 ,分析了在选择临界元件时应考虑的因素 ,提出了结构安全裕量对模糊安全域和模糊失效域的隶属函数的确定方法 ,给出了基本变量具有随机模糊性时综合考虑元件强度均值、变异系数以及隶属函数中的参数的临界元选择准则 ,建立了枚举结构体系主要广义失效模式的准则 。A general failure mode is defined by taking both randomness and fuzziness into consideration in the structural reliability. By investigating the effects of the parameters describing the random fuzzy uncertainty of both the basic variables and the state variables on the probability of the failure mode, the factors to be considered in enumerating significant elements are analyzed. The memberships of the limit state variable to the fuzzy safety and the fuzzy failure sets are determined. Then an engineering criterion is presented by synthesizing the effects of the mean, the coefficient of variation and the membership parameters to select the general failure modes. The example in section 3 shows that our method is feasible and effective.

关 键 词：失效模式 随机性 状态变量 结构体系 

分 类 号：TB114.3[理学—概率论与数理统计]