土—结构相互作用体系的非线性随机地震反应

Nonlinear seismic response analysis of soil-structure interaction systems on stationary random excitations

对土—结构相互作用体系的非线性进行随机分析,将地震地面运动模拟为零均值平稳高斯过程,建立了土—结构相互作用体系的运动方程.考虑多层剪切型钢筋混凝土框架结构非线性和地基土的非线性以及基础埋深对相互作用的体系反应的影响,把地基土的作用转化为作用在基础边界上的弹簧-阻尼器.算例表明:地基土的非线性特性所造成的层间错动比上部结构非线性特性所造成的层间错动大,也就是说,考虑地基土非线性特性比仅考虑上部结构非线性特性结构体系的破坏更严重.

The nonlinear seismic response of soil-structure interaction systems is analysed; and seismic ground motions are simulated as the zero-mean Gaussian stationary process; the motion equations of the soil-structure system are established. The effects of the nonlinearity of soil-structure interaction systems of the shear mode reinforced concrete framed structure and foundation soil are considered. The effecs of foundation soil are transformed for the spring-damper on base boundary. The displacement between layers created from nonlinear characteristics of soil is larger than the displacement created by the nonlinear characteristics of the upper structure. The damage under the condition of taking the nonlinerity of foundation soil into account is more serious than that only taking nonlinear characteristics of the upper structure into account.