Study On The Damping Effect Of Plate Rubber Bearing On The Mixed Structure Of Grid Structure And Concrete Frame

In this paper,two kinds of Steel net-concrete frame with different support connection have been established by the ANSYS finite element software.Firstly,the internal force and displacement of each model are analyzed.Based on this,The first two models were selected for seismic analysis under different earthquake,by different analysis methods.And studied the patterns of displacement and internal forces of different models.At the same time,The seismic isolation performance of rubber bearing has been discussed.The results show that the model self-oscillation frequency is much higher When the under supporting structure is not considered.When considering the lower supporting structure,the period of the whole structure becomes longer.Different support forms have obvious influence on the structure’s self-vibration characteristics and seismic response size.When the grid structure is hinged directly on the frame column,the first few vibration modes of the structure are mainly the network frame structure which drives the overall movement and rotation of the lower frame structure.When the rubber bearings are connected,the first few modes are mainly manifested as the lower support structure to drive the movement of the rod parts near the support base.When the response spectrum method and time history analysis method are used to calculate the response under small earthquakes,the latter result is larger.Especially in the increase of rubber bearing model.Under the earthquake condition of fortification intensity,the seismic response of the second model is significantly reduced.At the same time,due to the internal force redistribution,the eccentric force of the whole model is reduced,which make the force of the grid structure more uniform and the horizontal displacement more smaller.Under the action of this earthquake,the structure is still in the elastic phase.Finally,the distribution of plastic rods and damage of plate rubber bearings has been analyzed in the case of rare earthquake.Because the model of banquet hall is designed by MstCAD(1.20 static load +1.40 live load +1.40 temperature load +7 half-set intensity),with the full stress calculation under the maximum working condition,considering the wind load of positive effect,only a few bars are broken;and the plate rubber bearing is still in the elastic range under the action of the earthquake.