Research The Effect Of The Rubber Base Isolated Under The Action Of Near-fault Earthquake

Base isolation technology is widely used in today's construction of the structure of the isolation damper design; It effectively reduce the structure action of earthquake response and damage, it improve the building structure ability of protecting against and mitigating earthquake disasters. It is one of the main form of engineering structure passive control, in the decades of base isolation technology development, put forward all kinds of the mechanics model of the isolation bearings applied to the isolation device, among them,. It can be used to simulate the geometrical nonlinearity and material nonlinearity of two characteristics abort bearing, is so far the mature mechanical model. However, along with the domestic and foreign scholars for base isolation structure seismic response research deeply, found some problems remain to be further research. Under this background, the main research of this paper is as follows:(1) In this paper, using the previous spring steel frame model, combined with the upper structure, composed of multi degree of freedom motion system, establish a motion equation; And use Newmark-? method to solve the double particle multi-degree of freedom dynamics equation of motion.(2) Horizontal and vertical correlation is another focus of this article; By controlling the lead core rubber isolation bearing mechanical model parameters to control the impact level of the vertical correlation.The structure is divided into three kinds of condition to calculate the seismic response of the base isolation structure, and the corresponding analysis work.(3) The characteristics of conventional seismic and the near-fault ground motion is different obviously, This difference must be through the loading of earthquake acceleration time history curve to affect the seismic response of the structure; And through comparison and analysis of action of the different types of earthquake seismic response has made some important conclusions; The results show that when under rarely occurred earthquake, the vertical correlation is more obvious; Especially in the near-fault rarely occurred earthquake is more obvious.(4) In this article, for example, eight layer shear isolation structure were obtained by MATLAB programming. The action of earthquake response of original structure and isolated structure are obtained in different conditions. And through the finite element analysis software Sap2000 to prove the validity of the MATLAB program Through the seismic response analysis some suggestions and requirements are given in building seismic design parameters for the later revision.