Research On Seismic Behavior Of Double Steel Composite Shear Wall With Gaps

Nowadays,with rapid development of science and technology,urban renewal is accelerating.More and more super high-rise buildings are standing in cities,and their heights are getting higher and higher.With the increase of the height,the adoption of the traditional concrete shear wall structure will increase the thickness of the shear wall,which will lead to a decrease in the natural vibration period of the structure and an addition in the effect of the earthquake on the structure.Moreover,The economic efficiency of the structure has declined.Therefore,many scholars have proposed a combination of steel and concrete to play their role to achieve the "1+1>2",and now there are many super high-rise buildings using composite structures,which includes steel reinforced concrete shear wall,single-layer steel-Concrete composite shear wall,double steel plate-concrete composite shear wall,etc.Among them,the double steel plate-concrete composite shear wall has high bearing capacity,good ductility,for which is widely used.In this paper,a new type of double steel plate-concrete composite shear wall is designed and tested,and we also analyze its mechanical properties and flexural capacity of the new type composite shear wall.The research work is as follows:(1)A total of seven double steel plate-concrete composite shear wall specimens were subjected to low-cycle reciprocating load tests.The test parameters included axial compression ratio,with vertical and horizontal gaps,and the shape of horizontal gaps.The entire process of loading and recording is performed by the MTS servo hydraulic press.(2)The mechanical properties and seismic performance of the specimen were analyzed from the failure morphology,hysteretic curve,skeleton curve,ductility coefficient,strength and stiffness degradation,and energy dissipation capacity of the specimen.The results show that the specimens with vertical gaps have good ductility and bending resistance,high bearing capacity and good energy dissipation capacity.It is a kind of composite structure with excellent seismic performance.(3)Based on the previous studies of confined concrete by scholars,a constitutive model of concrete and steel was established,and based on the full-section plastic hypothesis and the principle of stiffness distribution,the formula for calculating the flexural capacity of specimens with vertical splicing was deduced.The stiffness of the test specimens with horizontal gaps was deducted to determine the flexural bearing capacity.The calculated results were well approached with the experimental results.