A new iterative algorithm is presented for seeking the design point in the FOSM reliability index analysis.
针对一次二阶矩法可靠度指标分析中验算点的计算问题，提出一种新的修正迭代算法。
The result obtained has been compared with the one obtained by first order second moment (FOSM) method expanded about mean value.
为此 ，用基于验算点处展开泰勒级数的哈桑———林德法计算了轴心压杆稳定可靠性的可靠性指标 ，并同均值一次二阶矩法作了比较 。
In case of maximum force, reliability index can be produced by analyzing reliability of simplified model with reliability theory (improved FOSM).
在受力最大的情况下，通过可靠度理论(改进的一次二节矩法)对简化模型进行可靠度分析，得到了可靠度指标。
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。
Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.
一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。
The main conclusions obtained in this thesis are as follow:(1) Based on FOSM, Second-order second-moment method modifies the results of FOSM, and has better calculation accuracy.
本文的主要结论有：（1）二次二阶矩法是以一次二阶矩法为基础，并对一次二阶矩法的计算结果进行二次修正，在多数情况下有着更好的计算精度。
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。
FOSM is usually used for the explicit performance function, and the accuracy of FOSM can not satisfy the engineering requirement sometimes for the structures which have higher reliability requirement.
一次二阶矩法可以方便用于功能函数为显式表达的情况，但对于可靠性要求较高的结构，其计算精度有时不能满足工程需要。
FOSM is usually used for the explicit performance function, and the accuracy of FOSM can not satisfy the engineering requirement sometimes for the structures which have higher reliability requirement.
一次二阶矩法可以方便用于功能函数为显式表达的情况，但对于可靠性要求较高的结构，其计算精度有时不能满足工程需要。
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