结构系统可靠性计算的方向概率法  

Reliability analysis of structural systems based on directional probability method

作　　者：吴剑国[1] 金伟良[1] 吴亚舸[2] 

机构地区：[1]浙江大学土木工程博士后流动站,浙江杭州310027 [2]同济大学土木工程学院,上海200092

出　　处：《海洋工程》2004年第2期62-65,共4页The Ocean Engineering

基　　金：水利部重点创新项目"长距离跨流域调水工程风险分析研究"资助项目

摘　　要：通过随机空间的映射变换,将多个失效模式的失效面统一变换到随机独立的标准正态空间(Gauss空间)内,利用该空间球坐标沿其径向的χ2分布特性,计算系统失效域上的失效概率。由于无需进行模式间相关性的近似分析,因而提高了系统失效概率的计算精度。两种结构的可靠性分析算例表明,该方法实用性强,操作性好,精度较高,对于有高度非线性失效面方程的可靠性计算问题亦有很强的适应性。In this paper, all the failure surfaces are transferred into Gaussian Space by transformation of random variable space, and thus the properties of chi-square-distribution in Gaussian Space can be utilized to calculate the failure probability in the total failure area. Because there is no need to determine the correlation of failure modes approximately, the precision of analysis can be raised. Examples for two structures indicate that this method is practical and useful, and is especially suitable for the reliability analysis with highly non-linear failure surfaces.

关 键 词：结构系统可靠性 失效模式 数值模拟法 

分 类 号：U661.1[交通运输工程—船舶及航道工程]