网壳稳定性可靠度的高阶矩法

High-Moment Method for Structural Reliability of the Stability of Reticulated Shell Structures

网壳稳定性计算中各随机变量的概率分布函数很难确定,这给网壳稳定性的可靠度计算带来困难。本文建立了网壳可靠度计算模型,利用结构可靠度计算的高阶矩法,进行随机变量正态变换,避免了对随机变量分布形式的假设,算例表明,高阶矩法可较方便、准确地进行网壳稳定性可靠度计算。

In structural reliability compute of the stability of reticulated shell structure,the cumulative distribution functions of random variables is difficult to know.So the structural reliability analysis of the stability of the reticulated shell structures is very difficult.In the present paper,based on the computer model of the stability of the reticulated shell structures,the normal transformation for the random variables with the unknown cumulative distribution functions can be realized with high moment.Through example presented,the proposed method is found to be sufficiently accurate to the reliability compute with little extra computational effort.