考虑土料参数变异性的土层地震反应分析

Seismic response of soil layers with random material parameters

本文将土料的动剪模、阻尼比等作为随机量处理,引入随机有限元法和富里叶变换技术,在频域内建立有限元递推方程;同时利用等价线性化法通过迭代循环来近似模拟土料动力特性的非线性,集中分析了土料动力参数的变异性引起的土层反应变异性,以水平成层地基为例进行了具体计算,结果表明,土层地震反应的变异性与输入土动力参数的变异性具有相同的量级。

In this paper, the dynamic shear modulus and damping ratio of soils are taken as random variables. By using the random finite element method and Fourier transformation technique, the recurrence equations of finite element are established in frequency domain. The dynamic nonlinearity of soil is approximately simulated by equivalent linearization approach through the iterative procedure. The variation of dynamic response of soil layers caused by the variation of soil parameters is investigated. The horizontal soil layers are taken as an example and the dynamic responses are calculated. The results show that the amplitude of the coefficients of variation of dynamic response is almost the same of those of soil parameters.