多次区间载荷下结构混合动态可靠性的计算  

Calculation of Structural Hybrid Dynamic Reliability Under Multiple Interval Loads

作　　者：方永锋[1] 陈建军[1] 阎彬[1] 曹鸿钧[1] 

机构地区：[1]西安电子科技大学电子装备结构设计教育部重点实验室,陕西西安710071

出　　处：《华南理工大学学报（自然科学版）》2013年第11期91-95,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51175398);毕节学院高层次人才科学研究项目(院科合字G2013007号)

摘　　要：针对多次区间载荷作用且结构随机强度退化和不退化的混合动态可靠性预测模型,用等效区间载荷代替多次区间载荷,并将该等效载荷视为均匀分布的随机变量,对均匀分布的随机载荷和结构的随机强度进行了当量标准正态化处理.根据应力-强度干涉理论,利用一次二阶矩法求得结构在多次区间载荷作用下的动态可靠度.最后,通过3个算例说明了文中方法的合理性、实用性和精确性.This paper deals with the prediction model of structural hybrid dynamic reliability under multiple interval loads and with or without structural stochastic strength degradation.In the investigation,first,equivalent interval loads are used to substitute multiple interval loads and are taken as random variables with uniform distribution. Next,the random variables and the structural random strength are equivalently normalized.Then,the structural dy-namic reliability under multiple interval loads is calculated by using the first-order second-moment method according to the stress-strength interference theory.Finally,three numerical examples are presented to demonstrate the rationa-lity,practicability and accuracy of the proposed method.

关 键 词：结构 区间载荷 随机强度 动态可靠性 

分 类 号：TH122[机械工程—机械设计及理论]