随机过程激励下随机结构系统可靠度分析的一种方法

提出了随机过程荷载激励下，具有随机参数的结构系统可靠度分析的一种方法，该方法基于首次超越破坏机制，分析随机过程荷载激励下，结构参数（随机变量）取某一确定向量时的条件失效概率，采用Ｍｏｎｔｅ Ｃａｒｌｏ技术模拟结构参数的随机性，由条件失效概率给出随机结构的无条件失效概率，最后对中方法和程序作了检验，并进行了实际计算。

AN APPROACH TO RELIABILITY OF UNCERTAIN STRUCTURES TO STOCHASTIC PROCESS EXCITATION

An approach to the reliability of structural systems with uncertain parameters subjected to stochastic process excitation is presented. A formulation as a first passage problem for a vector process outcrossing a safe set is first applied for a fixed value of the random variable vector constituted by the uncertain parameters of the structural system. This gives a conditional failure probability, and a integration technique based on Monte Carlo simulation is then used to compute the unconditional failure probability. As an example, the approach is applied to the reliability analysis of a gravity pier under stochastic earthquake excitation.