【摘要】 基于结构时变抗力的统计特性 ,提出了考虑时变抗力瞬变衰减的一个随机过程界限 ,并推导了基于这种随机过程界限的时变动力可靠性计算基本公式 ;给出了非平稳过程线性组合的首次超越动力可靠度的一个有效数值计算方法。算例的结果表明 ,考虑时变抗力瞬变衰减时 ,动力可靠性随动荷载的持续时间迅速下降更多还原

【Abstract】 In the paper,a stochastic process bound model is propsed for considering the instantaneous deterioration based on statistical characteristics of the structural time|dependent resistance.Then,the basic formulas for time|dependent dynamic reliability of a structure considering the stochastic process bound are proposed.An efficient numerical method is proposed for calculation of the first crossing reliability of non stationary process linear combination.The results of an example showed,considering the instantaneous deterioration of structural resistance,that the reliability is reduced rapidly with the extension of lasting time of dynamic loads.更多还原