Study On Seismic Performance Of Composite Steel Plate And Concrete Shear Walls With Comparing Different Boundary Element

Nowadays,with the rapid development of the national economy and land resources have become more and more precious,the demand for high-rise buildings increases day by day.Shear walls,as the main lateral force resistant members in high-rise buildings,are also constantly innovated and developed.The rapid development of economy and the improvement of people’s living standards have accelerated people’s demand of higher building heights and better building performance,as well as higher demands for various performance indicators of shear walls at the same time.Therefore,a thin steel plate composite shear wall with stiffening ribs is proposed,which satisfies the demand for better performance indicators of shear walls.Compared with the multiple-cavity externally-encased steel plate and concrete composite shear wall,which is currently more widely used in China,thin steel plate composite shear wall can further improve the casting mobility,cold bridge of walls and integrality of the former while maintaining superior anti-seismic performance at the same time.Based on these advantages,more and more studies on this type of shear wall have emerged recently.However,the current researches focus more on the anti-seismic performance of the “I-shaped” single-piece wall of the shear wall,but less on the edge members of the new shear wall structure.Therefore,this paper takes such kind of thin steel plate composite shear wall as the research object,designs four test pieces with different edge members,and adopts a combination of low cycled reversed loading experiment and numerical simulation and parametric analysis to study the differences in hysteretic behavior,deformation performance,rigidity degeneration,strength degradation and other anti-seismic performance of the test pieces with different edge members,and finally analyzes the reasons for such differences.Based on this,this paper draws the following major conclusions:(1)The failure process and mode of the thin steel plate composite shear wall are mainly reflected in the buckling or bulging of the lower part of the outer steel plate of the wall and the development of a buckling zone,and buckling or tearing occurs at the bottom of both sides of the wall.The concrete inside the steel plate is only slightly damaged at the bottom.The ultimate failure is that the steel plate at the lower part of the shear wall yields or tears,while the upper part of the wall is basically intact.(2)The hysteresis curve of the thin steel plate composite shear wall with edge members is shuttle-shaped,the hysteresis is relatively full,the ductility performance is good,and in general,the anti-seismic performance is superior(3)According to the analysis of the strain gauge data,the bottom steel plates on both sides of the member will yield first,and then as the load increases,the yield range will gradually increase and develop toward the middle,while the increase of the area of the edge member can change the strain characteristics within the height range of the center,making the member with a large edge member area,compared with the one with smaller area,the steel plate in the middle position have a large deformation in advance.This phenomenon will not change the overall failure mode,but it is beneficial to lifting the energy consumption capacity of the member.(4)By comparing the anti-seismic performance of the four members,it was found that the addition of wing walls can effectively improve the bearing and energy consumption capacities of the members.The addition of end posts can effectively improve the ductility of the members.