非线性土—结动力相互作用的时域子结构分析

采用子结构方法分析了二维平面应变有限元土—结动力相互作用。为研究土—结相互作用的影响,进行了土—结相互作用问题的完整分析,即考虑线性和非线性土—结相互作用及不考虑土—结相互作用进行了分析计算。土—结相互作用的时域分析计算量很大,为减小计算量,提出了计算褶积分的有效方法。算法基于单位脉冲反应矩阵在某个时间步后的线性时间关系进行近似求解,即采用递归算法。对长模拟时间,这种时间近似求解能显著减小计算量。

An effective time domain substructure analysis for non-linear seismic soil-structure dynamic interaction

A 2-dimensional plain strain finite element seismic structure-soil interaction（SSI） analysis based on the substructure method was presented.A complete SSI analysis was performed to investigate the effects of SSI,which included linear and non-linear SSI analyses and analysis without the consideration of SSI.To reduce the large amount of computation in the time domain analysis of SSI problem,an effective algorithm of calculating the convolution integrals was presented.The algorithm,a recursive algorithm,was based on an approximation of the unit impulse response matrices by linear time dependence after a certain time-step.The results indicate that the approximation in time leads to dramatically reduced computation for long simulations.