岩土力学2017，Vol.38Issue(3)：847-856,10.DOI:10.16285/j.rsm.2017.03.030
二维土层地震反应分析的时域等效线性化解法
Time-domain equivalent linearization method for two-dimensional seismic response analysis
摘要
Abstract
The seismic response analysis of local complex sites with nonlinear characteristics has been the key problem to solve in prediction of seismic motion.Frequency domain equivalent linearization,widely used in the seismic response analysis of one-dimensional stratified sites,is extended to time domain and two-dimensional problems.A time-domain explicit finite element method can be used to consider nonlinear characteristics and it is suitable for seismic response analysis of complex engineering sites.In this method,the inner domain of the method is mainly used to realize the low-order finite element scheme of the explicit algorithm.The boundary of the artificial boundary is simulated by the boundary of the transmission boundary.The maximum tangent strain in the one-dimensional model is replaced by the maximum tangent strain in the plane strain state,and the equivalent shear strain is obtained according to the tangent strain of the whole time process.Each time the whole solution is solved by the time domain center difference,and the nonlinear characteristic analysis is done by iteration.In order to verify this method,two typical site models of horizontal stratified and two-dimensional basins are selected for simulation analysis.The results are compared with solutions of the traditional one-dimensional equivalent linearization model and the two-dimensional differential nonlinear calculation.The results show that the solution is in good agreement with the reference solution,and prove the reliability of the method.This method is used to simulate the surface vibration of the US Turkey Flat test site.The results are compared with one-dimensional equivalent linearization model and the measured record.The reliability of the method and the difference with the existing analysis model are discussed,and the influence of the nonlinear characteristics on the seismic motion is illustrated.关键词
非线性特征/等效线性化/时域显式有限元/地震反应Key words
nonlinear characteristics/equivalent linearization/time-domain explicit finite element/seismic response分类
建筑与水利引用本文复制引用
杨笑梅,赖强林..二维土层地震反应分析的时域等效线性化解法[J].岩土力学,2017,38(3):847-856,10.基金项目
国家自然科学基金资助项目(No.51178123).This work was supported by the National Natural Science Foundation of China (51178123). （No.51178123）
