One method was getting the maximum and the minimum of the structural performance function by optimization, and then calculating the ratio of mean-value to deviation of the performance function.

一种方法是先优化得到结构功能函数的最大和最小值，再计算功能函数均值和离差的比值；

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Structural reliability analyses seek to calculate the failure probability of a predefined performance function.

结构可靠度分析的核心是计算预定义功能函数的失效概率。

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