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的功能函数展开，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？

Mean first order second moment method, the use of taylor series in the average at the limit state function function expansion, linearization, so that the calculation is relatively simple, you can export the analytical expression directly gives the reliability index β and the statistics of random var

Value is a 2-Step torque Taylor series, with the average of the limit state function, a function to calculate the linear, more simple, you can export a 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 of limit State function 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 variables, ana

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