Seismic Response Analysis Of Base Isolated Frame Structure

The occurrence of an earthquake is a small probability event,but if it happens,it will cause irreparable economic losses and serious casualties.Therefore,the seismic fortification of building work in the first place is the responsibility and obligation of every country can not shirk,in order to truly improve the seismic fortification level of the building,engineering and technical personnel of the countries all over the world in the study on seismic theory and experimental analysis of the application of the isolation technology until the day in and day out,in the building,can really ensure the building collapsed in the earthquake,which can provide protection for the safety of life and property from the actual meaning.First of all,the development and application of base isolation technology are discussed.It is shown that the base isolation technology has a long history in seismic field and there are a large number of buildings in the modern society.And the principle of seismic isolation technology is described in detail.Secondly,the classification and structure of isolation bearings are introduced.Then the principle of base isolation is described,and the numerical integration process of Newmark method is derived.Finally,according to the basic principle and analysis method in front of using large-scale general finite element software ANSYS to establish the finite element base isolation bearings 2 span 5 layer analysis model of the base isolation concrete frame structure model of finite element software ANSYS is analyzed in the process of earthquake wave,EL-Centro wave and Tianjin wave in Qian'an.Compared with the traditional anti-seismic structure.The final results can explain the base isolation structure both in the interlayer displacement,interstory drift,acceleration of the top of each layer and acceleration are better than the traditional anti-seismic structure,which illustrates the isolation structure in the earthquake can reduce the horizontal earthquake damage degree,greatly improve the seismic performance of the structure,is a kind of good seismic measures.Finally,using the finite element software SAP2000 analysis on Pushover structure,introduces the capacity spectrum analysis method,and discussed and analyzed for the isolation system Pushover implementation methods and the lateral load pattern,by comparison with the results of nonlinear time history analysis,validate the reliability of this method and show that the Pushover analysis method in the seismic analysis,we can get the structure of the plastic hinge in the nappe in the process of order and distribution,but also find out the structure itself has weak layer,provide the basis for the implementation of the performance evaluation system of isolation structure.