Experimental Study On Butterfly-shaped Steel Plate Shear Wall With Stiffeners Restricting Only Out-of-plane Deformation

The butterfly-shaped steel plate shear wall is an improved form of steel plate shear wall with slits that is connected to the frame beams and not connected to the frame columns,and has better ductility and energy consumption performance.In this paper,a king of butterfly-shaped steel plate shear wall with side stiffeners that restrict out-of-plane deformation is designed,and experiments and simulation studies are carried out to analyze the variation of its mechanical performance and seismic energy dissipation under different design parameters.The main content of the paper is as follows:1)Under the premise of controlling the waist-width ratio of the butterfly rod to 0.4,according to the difference of the height-thickness ratio,the aspect ratio of the butterfly rod and whether the side stiffeners are provided,6 full-scale butterfly-shaped steel plate shear wall test pieces are designed,and conducted a low-cycle reciprocating load test on it using a displacement loading system,focusing on the influence of the above parameters on the hysteretic performance,bearing capacity and energy dissipation performance of the specimen.In addition,two of the specimens have the same design parameters,but the loading levels are not completely consistent.The aim is to investigate the impact of the number of low-cycle loading cycles on the above-mentioned performance of the specimen.2)Using the finite element software Abaqus6.14-1,the three specimens in the test were numerically simulated,and the overall and local deformation,hysteresis curve and bearing capacity of the simulated and tested specimens were compared,and the modeling method was verified Reliability.3)Using the above modeling method,the design parameters of the height-to-thickness ratio and the aspect ratio of the butterfly rod were refined,and add a set of model specimens with different plate aspect ratios.The influences of various parameters on the hysteresis curve,stiffness,bearing capacity and energy dissipation performance of the specimen were further compared.4)Research results shows that: the out-of-plane reinforced side stiffeners can effectively limit the out-of-plane deformation of the butterfly-shaped steel plate shear wall,thereby greatly improving the energy consumption capacity of the butterfly-shaped steel plate shear wall,and to a certain extent,it improves its bearing capacity,so this kind of steel plate shear wall is a good lateral resistance and energy dissipation component;the final failure mode of the steel plate wall is the tearing of the edge of the inner plate edge;reducing the number of initial loading cycles will improving the test piece later energy dissipation capacity;as the height-to-thickness ratio and aspect ratio of the butterfly rod decrease,the stiffness,bearing capacity and energy consumption of the wall panel increase significantly,but if the aspect ratio of the butterfly rod is too small,it will adversely affect the mechanism performance of the steel plate wall;as the wall panel height-to-width ratio decreases,the specimen stiffness and bearing capacity increase,but the energy dissipation capacity decreases;The reasonable design parameters of the butterfly-shaped steel plate shear wall may be the butterfly rod height to thickness ratio L/t between 80 and 100,the butterfly rod height to width ratio L/b = 6,and the wall panel aspect ratio H/W between1.5and 2.0.