Parametre Analysis On Lateral-Torsional Coupling Of Soil-asymmetric Structure Interaction System

Soil-Structure Interaction (SSI) has been one of the most important issues of earthquake engineering in the world in the recent thirty years. Since it is a crossing subject involving earthquake engineering, structural engineering, ground foundation, random vibration, seismology, and higher mathematics etc. there are many problems that should be investigated deeply.In this field , the mass centre and the stiffness centre are not at the same place for the mass and the stiffness distributing abnormally in the structure floor, which leads to lateral-torsional coupling response of soil-asymmetric structure interaction system differently. The in-depth and systematical research is still deficiency , So it is very important to research on the regular seism response of soil-asymmetric structure interaction and to comlete the issues in the code.In this paper, the dynamical theories are used to study the parameter analysis on Lateral-torsional coupling of soil-asymmetric structure interaction system. The works of this paper are as follow :1. A bilinear stiffness model and the piece wise linear foundation model are used to establish the soil-asymmetric interaction system model.The Lagrange energy equation is used to build coupling equation of horizontal motion and torsion motion .2. The infecting parameters of soil-asymmetric interaction system are extensively resolved and analyzed . The related problems of the range of eccentricity ratio and torsional translation frequency ratio ,also the influence of the above parameters are analyzed detailedly .3. Soil-asymmetric interaction system time history response procedure for elastic and elastic-plastic phase is programmed in Matlab language.using the procedure ,the elastic influence of the parameters are made .A comparative analysis of time-history analysis and analysis method is used to make time-history analysis for parameters analysis feasible .4. the difference characters of soil-asymmetric interaction system under elstic seismic and elstic-plastic seismic response are got from Comparisons and analysis on the parameters influence of soil-asymmetric interaction system under elstic seismic and elstic-plastic seimic response ,then some helpful conclusions for practical projects are obtained.