Shaking Table Test And Finite Element Analysis On The Joint Use Structure Of Damping And Isolation

With the continuous improvement of China's economic level,people put forward higher requirements on the seismic performance and function of the structure,building vertical shape and layout of the plane is facing complicated and diversified direction.Complex appearance of buildings can easily lead to beyond the requirements of the provisions of the specification such as structural overrun,irregular,etc.The use of damping and isolation technology is an effective means to improve the seismic performance of the structure,However,the study of structural passive control is mainly focused on a single shock-absorbing structure or isolated structure,the earthquake disaster data and research of the joint use of damping and isolation is less.The seismic performance and design analysis of the joint use of damping and isolation structures need further study.Based on this,the design and analysis method of buckling restraint damping and rubber bearing isolation is proposed in this paper.And the structure of Chengjiang fossil museum with additional buckling restraint and support bearing is studied.The main research contents and achievements are as follows:1.According to structural fortification objectives,site conditions and other factors,this paper presents a joint design method of damping and isolation for multi-story concrete-filled steel tubular frame structures.Firstly,design the isolation layer with the equivalent support,calculate the shock absorption coefficient,so as to determine the seismic level of the upper structure,and then design the parameter of BRBs according to the seismic level,finally,check the isolation layer and the upper structure seismic performance under the influence of rare earthquakes.2.According to the similarity theory,the overall model was designed and fabricated at a scale of 1:30,and the shaking table test was carried out comprehensively.The dynamic characteristics of the model,the acceleration response of each floor and the strain response of the important components were measured,obtained the displacement by integrating the acceleration data twice,and observed the deformation of the isolation pad and the component.analyze and judge the seismic performance,plastic development and weak place of the structure through the dynamic characteristics and displacement of the model structure under the action of each level earthquake,the analysis results provide guidance for design.3.Based on the vibration table test,the dynamic and plastic time-history analysis of the test model is carried out by using the SAP2000 software.The test data of the cycle,mass,acceleration and displacement are compared with the calculated values to verify the reliability and accuracy of the test data.It is proved that the combination design of shock absorption and isolation can effectively improve the seismic performance of the structure,the upper structure can be decreased once fortification requirements to design,and the structural torsion irregularity is solved.In this paper,a joint design and analysis method of BRB damping and rubber bearing isolation is proposed,then apply shaking table test and finite element analysis to study the Seismic performance of Chengjiang fossil museum,The results of which can provide a reference for the application and research of the irregular structure of the combination use of damping and isolation.