求翻译：均值一次二阶矩法，采用Taylor级数在平均值处把极限状态功能函数展开，使之线性化，计算比较简便，可导出解析表达式，直接给出可靠度指标β与随机变量统计参数之间的关系，分析问题方便、灵活，其基本原理为：是什么意思？

The mean first order second moment method, the use of taylor series to commence at the average of the limit state function to make linearization, the calculation is relatively simple, can be derived the analytical expression of reliability index β is given with the statistical parameters of random v

Value is a 2-Step torque Taylor series to be in average to limit state function, one of the linear calculation is straightforward, and can be exported, parsing expression directly to a reliable index to beta random variable parameters of the relationship between statistics and analysis of the issue

An average value second moment law, uses the Taylor progression to launch in the mean value place the limiting condition function function, causes it linearization, the computation quite to be simple, may derive the analytic expression, gives the margin of safety target directly beta and between the

Mean value of a second-order moment method, using Taylor series function expansion limit State functions at the average, linearization, calculations simpler, you export the analytic expression, directly to a reliability index β and the statistical relationship between the parameters of random variab

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