CAJ | 학술논문

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。
침대다차구간재하작용차결구수궤강도퇴화화불퇴화적혼합동태가고성예측모형，용등효구간재하대체다차구간재하，병장해등효재하시위균균분포적수궤변량，대균균분포적수궤재하화결구적수궤강도진행료당량표준정태화처리。근거응력-강도간섭이론，이용일차이계구법구득결구재다차구간재하작용하적동태가고도。최후，통과3개산례설명료문중방법적합이성、실용성화정학성。
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.