最常用的方法有一阶可靠性方法（First Order Reliability Method：FORM）和二阶可靠性方法（Second Order Reliability Method：SORM）。一阶可靠性方法利用直线对概率约束边界进行逼近，它的计算成本低，操作方便，适用于线性和非线性程度不高的问题。
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Based on reliability theory, the first order second moment method (JC method) is adopted to analyze and compute the fatigue reliability.
基于可靠度理论，本文采用一次二阶矩法(JC法)对疲劳裂纹扩展可靠性进行计算。
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。
Secondly, the procedure of tunnel lining based on First Order Second Moment(FOSM) and JC method is presented to calculate the reliability of tunnel lining.
根据提出的可靠度计算理论和方法，编制了基于一次二阶矩和JC法的可靠度计算程序。
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