地震波反演与土-结构动力相互作用分析

Inversion of Ground Motion and Analysis of Soil-structure Dynamic Interaction

基岩地震动的确定是土-结构动力相互作用分析的关键步骤之一。本文基于一维剪切波动理论,利用MATLAB编制了自由场地表波向基岩波反演的计算程序,进行了数值验证,并对汶川地震同济大学实测地震波进行了反演计算,分析了反演基岩地震波与地表波的差异。在此基础上,采用ANSYS软件建立土-结构相互作用体系分析模型,以土层深处的反演地震波作为输入,对土-结构相互作用体系进行了地震反应分析,探讨了在El Centro波及汶川地震同济大学实测波二种不同反演波输入下,桩基承台及上部结构地震反应的差异,得到了有工程参考价值的结果。

It is a key step to determine the bedrock earthquake motion in the analysis of soil-structure dynamic interaction system.Based on 1-D shear wave theory,the inversion program was developed.Then,the El Centro wave was inversed,and the SHAKE program was used to justify the correctness of the inversion program.The inversion program was used to inverse the observed wave of Wenchuan earthquake in Tongji university and the bedrock wave was obtained and the difference between the surface wave and the bedrock wave was studied.Then,the finite element model of soil-structure dynamic interaction system was built,and the seismic response analysis was executed,by using the inversed waves as inputted waves.The difference of the response of pile foundation and structure was also discussed when the different waves are inputted and some useful results were acquired.