变量相关下结构可靠指标β的计算  

Calculation of Structural Reliability Index β with Correlated Variables

作　　者：郄禄文[1] 

机构地区：[1]天津大学建工学院

出　　处：《港工技术》2004年第1期19-22,共4页Port Engineering Technology

摘　　要：根据结构可靠指标 β为在标准正态坐标系中原点至极限状态曲面最短距离的基本定义 ,在广义随机空间中 ,将在欧洲通用的确定变量独立时 β值的 Hasofer- L ind方法推广至适用于变量相关时的情况。 3个算例的对比结果验证了新提出计算方法的正确性。The structural reliability index β is defined as the distance from origin to the nearest point of the failure surface in the normalized coordinate system.The Hasofer-Lind reliability index β is generally used in Europe for determining the reliability index of independent variables.This paper extends the method in a generalized stochastic space to be applicable to the condition of variables are correlated.The results obtained by the method for three examples have shown that the β values are equal to the true ones.

关 键 词：变量相关 广义随机空间 结构可靠指标 功能函数 影响系数 泰勒级数展开 

分 类 号：TB114.3[理学—概率论与数理统计]