...扰动方法（如矩方程法，格林函数法，混合格林函数法）及基于Taylor展开 的所谓一次二阶矩法（first-order second-moment method）。所有这些方法在用于实际现场尺寸的流动 和（或）输运问题时，所需计算量很大。
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adapted first-order second-moment method 改进的一次二阶矩法
adapted first- order second-moment method 改进的一次二阶矩法
improved first-order second-moment method 一次二阶矩法
Integral first-order second moment method 积分一次二阶矩法
advanced first-order second-moment method 改进的一次二阶矩法
The first-order second-moment method is fundamental in structural reliability analysis, its accuracy depends upon the nonlinear extent of performance functions around checking point.
一次二阶矩方法是结构可靠度分析的基本方法．一次二阶矩方法的计算精度依赖于验算点附近功能函数的非线性程度。
The present usually reliability analysis method for engineering structures are Monte Carlo Simulate (MCS), First-order Second-moment method (FOSM) and reliability Surface method (RSM).
现有基本的结构可靠度计算方法可分为一次二阶矩法、蒙特卡罗法和响应面法。
The advanced first order and second moment iterative method are employed for calculation on reliability index and failure probability.
采用改进的一次二阶矩法对腐蚀管道的可靠性指标和失效概率进行了分析和计算。
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