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本文采用Ｍｏｎｔｅ－Ｃａｒｌｏ方法进行结构可靠度的数值模拟，提出了以条件期望和重要抽样相结合的改进模拟方法，保证了每次抽样模拟的有效性。数值例题表明了这种模拟方法的有效性和广泛的适用性。
In this paper, the Monte-Carlo method is used to simulate the structural reliability, and an improved simulation method combining conditional expectation with important sampling is proposed to ensure the effectiveness of each sampling simulation. Numerical examples demonstrate the effectiveness and wide applicability of this simulation method.