Study On Seismic Performance Of Square Steel Tube-steel Concrete Shear Wall

My country’s social development and the quality of life are improving day by day.At present,buildings are constantly breaking through the direction of large spans and multiple floors,so that the pure reinforced concrete structure or pure steel structure can no longer meet the demand,so new combinations such as steel-concrete shear walls are constantly emerging in actual projects.Therefore,based on the existing steel-concrete shear wall,this paper proposes a new construction method,namely the square steel tube-steel-steel concrete shear wall,and studies and analyzes its seismic performance.Based on the existing tests and the characteristics of the steel-concrete shear wall,this paper uses ABAQUS to create a finite element model,and verifies the reliability of the parameters taken during the modeling;ABAQUS is used to separate the steel-steel-concrete shear wall and the ordinary steel bar.The concrete shear wall,the stiffened square steel tube-steel-steel concrete shear wall and the non-stiffened square steel-steel concrete shear wall are subjected to numerical simulation calculations of repeated horizontal loading,in terms of bearing capacity,stiffness,ductility and hysteretic energy consumption.Compared and analyzed the difference in seismic performance;and analyzed the parameters of the above-mentioned square steel tube-steel-steel concrete shear wall.By changing the axial compression ratio,the steel plate wall thickness,the concrete strength,the aspect ratio and the steel plate strength,we obtained Develop laws that affect its seismic performance.The research concluded as follows:(1)The peak bearing capacity and ultimate bearing capacity of the square steel tube-steel steel plate concrete shear wall are 46.85% higher than that of the reinforced concrete shear wall,and the initial stiffness is relatively large.After the peak load is reached,the stiffness increases with the load The degradation is relatively gentle,and the equivalent viscous damping coefficient is greatly improved.It can be seen that adding steel plates to the concrete shear wall can greatly increase the bearing capacity,make the stiffness degradation gentle,and improve the seismic performance.(2)The hysteresis curves of the two square steel tube-steel concrete shear walls are full,and the envelope area is large,showing good energy consumption.Among them,the stiffened square steel pipe-steel concrete shear wall has stronger energy consumption than nonStiffened;in the later stage of loading,the stiffness of the two decreases relatively smoothly.It can be seen that the steel plate stiffening can effectively suppress the out-of-plane displacement of the steel plate,thereby improving the energy dissipation capacity of the square steel tube-steel concrete shear wall.(3)Through the analysis of the influence parameters of the steel tube-steel concrete shear wall: the greater the aspect ratio,the more severe the reduction in bearing capacity and the worse the ductility;the deformation capacity,bearing capacity and ductility will increase due to the increase in steel strength;With the increase of concrete strength and axial compression ratio,its deformation capacity will decrease,but the bearing capacity can be increased to a certain extent;when the steel plate wall thickness increases to a certain extent,the ductility of the member will decrease,so it should be reasonable in actual engineering.thickness.According to research,steel strength,steel plate wall thickness and aspect ratio are the main factors affecting the seismic performance of square steel tube-steel concrete shear walls.