Analysis Of The Influence Of Mechanical Parameters Of Rubber On The Seismic Response Of Shear Wall Isolation Structure Of Tall Building

With the rapid development of social economy and the acceleration of urbanization process,the research on earthquake disaster of human beings has been deepened.Among them,after several decades of development and application of seismic isolation technology,it has been shown that the seismic isolation technology is one of the effective methods for seismic isolation.Today,the application of this technology has not only limited to the middle and low layer structure,is to the high aspect ratio,the layout of complex high-rise building development.At present,the application of isolation technology in China is limited to buildings with high aspect ratio of less than 4,and few examples are applied to high-rise buildings.In this paper,the problems of high-rise isolation structure analysis,isolation structure and isolation support design are discussed.The main research contents are as follows:(1)Research progress and development status of high-rise isolation technology at home and abroad based on the recovery of bearings of several commonly used summary analysis model of the force model,high-rise isolated building and dynamic principle,put forward a series of problems to be solved:bearing mechanical parameters on high aspect ratio seismic response analysis of high-rise building is not clear;high width is larger,the layout of the complex high-rise structure under earthquake is especially prone to large overturning moment under rare earthquake,the bearings into tensile state or local bearing compressive stress is too large or even destroyed.(2)To study the bearing level of lateral stiffness of isolation system of high-rise building,establish seismic wall isolated and non isolated structure model using finite element analysis software ETABS,the seismic response of upper structure and isolation layer analysis method by using the time history analysis,the seismic fortification intensity,the damping coefficient of isolation structure is 0.37.The upper structure to drop once designed,the damping effect is notable.Under strong earthquake,the isolation layer under 7 seismic waves.The average displacement value is 213 mm,the maximum tensile stress of the bearing is-0.23 MPa,the maximum compressive stress is 13.84 MPa,there is no bearing tensile stress,meet the standard requirements for the deformation of the isolation bearing under rare earthquake and stress.(3)In the last step on the basis of changing the horizontal stiffness of the isolation bearing,analyzes the change of isolation coefficient and axial tension,bearing isolation layer displacement calculation,the analysis results show that the vibration period is increased by more than 37% earthquake force under the same reduced horizontal stiffness of the isolation bearing structure,damping the coefficient is reduced from 0.37 to 0.34,the maximum horizontal seismic influence coefficient decreased from 0.074 to 0.068.The isolation effect is more obvious.The change from each bearing axial force,bearing level is influenced by the axial force of the original stiffness after the axial force is decreased,and the original support force the smaller the value is bigger,from the fitting of the trend line visible decrease the level of stiffness after the trend line is more gentle,that is to say all the bearing force is balanced,which reduce the support stiffnessafter each bearing under axial force as much as possible the isolation layer is conducive to a better isolation effect.It can be seen that reducing the horizontal stiffness of the support can relieve the local compressive stress of the bearing and the tensile problem of the bearing to a certain extent.In a certain range,the overall damping effect of the isolation layer is improved.The change of horizontal stiffness,the maximum shear force of each bearing in X and Y direction values are reduced by more than 30%,the maximum horizontal displacement of the support increased significantly,increase the average 1/3,but when the bearing stiffness is reduced to a certain extent the horizontal displacement will exceed the allowable value,so it should be a horizontal displacement limit conditions appropriate adjustment of the horizontal stiffness of the support,in order to achieve a better damping effect.By checking the seating stress and horizontal stiffness changes before bearing the corresponding data comparison,it is concluded that with the support level of the rigidity of the lower bearing and the maximum tensile stress decreases,the bearing stiffness is beneficial to the control of high-rise isolated structure isolation layer within a certain tensile stress decreases,application and promotion favorable isolation technology in high-rise building.