Study On Weak Layer Position Of Interlayer Isolation System Based On Pushover Analysis

With the application of interlayer isolation system in engineering practice,its theoretical research is also developed.At present,it mainly focuses on the research on the working mechanism and shock absorption effect.There are few studies on the weak layer position and the failure order of the structural members of the seismic isolation system.In this paper,the static elastic-plastic analysis method is used to study the isolation performance,the weak layer position and the failure sequence of the layered seismic isolation system.In this paper,a three-dimensional structural dynamic analysis software ETABS is used as a tool,a part of the dormitory of a university is designed according to the optimal location of the isolation layer.After the calculation and analysis,a reasonable isolation bearing arrangement is obtained.Secondly,the Push-over analysis method of the story isolation system is summarized on the basis of the particularity of the calculation model.The interlayer isolation system is analyzed according to the method introduced.The load-displacement curve,Inter-story displacement,Inter-story drift and structural deformation diagram of the structure are obtained.Through analysis,the weak layer position and isolation performance of the isolated system are obtained.Then,the Push-over analysis method is used to investigate the correlation of the isolation system with the change of the isolation layer position.It is found that with the isolation layer changed,the seismic performance and the position of the weak layer of the isolation system also changed,namely,the isolation layer moves up,the isolation effect becomes worse,and the weak layer position moves downward.Finally,the analysis results of the base isolation system are compared with the segregation structure whose isolation layer is located at the top of the first floor columns.The results show that the isolation performance and the weak layer position distribution of the inter-story isolation system with low isolation layer are similar to base-isolated structure.In this paper,the isolation performance and the distribution of weak layer of the isolation system with different isolation layers are obtained by analyzing the different conditions of the interlayer isolation system with different isolation layer position.It is of great significance to evaluate the seismic performance of the segregated seismic system and the design of the layered seismic system.