Experimental And Simulation Study On Double-directional Butterfly-shaped Steel Shear Wall Used As Energy Dissipator

Two-sided connection steel plate shear wall with openings is only connected to the frame beam,which avoids the adverse effect on the frame column during loading;and opening changes the mechanical properties of the steel plate,the shear deformation of the steel plate is transformed into the bending deformation of the energy dissipation link.Although the design sacrifices the bearing capacity and stiffness of steel plate,it shows good energy dissipation and ductility,and the bearing capacity and stiffness of steel plate can be adjusted by changing the parameters of the links.This paper,aiming at the problem of two-sided connection steel plate shear wall with openings that the material utilization of energy dissipation link is low,there is distinct stress concentration on links,unreasonable design will cause the occurrence of Integral instability of the plate in the early loading stage,the hysteretic curve is pinched due to the out-of-plane instability of the energy dissipation links at the later loading stage,a new kind of double-directional butterfly-shaped steel shear wall used as energy dissipator is studied,the seismic performance of the steel plate shear wall and the influence of parameters on its performance are analyzed by experiment and numerical simulation.The main works of the paper are listed as follows:1)Four full-scale test specimens were carried out under low cycle reversed test,and effect of walls type on structural performance was studied.The hysteretic performance,bearing capacity,ductility,lateral stiffness degradation and energy dissipation capacity of the specimens were analyzed.Results reveal that the longitudinal parts of this kind of wall bear the majority of horizontal loads,the lateral parts serve mainly as energy dissipators,the whole plate achieved it's design purpose as energy dissipator.The hysteretic curves of each specimen is full,stable and excellent energy dissipation.It also has large bearing capacity and initial stiffness.Local buckling occurs at the end edge of the steel plate due to overturning moment in the later stage of the test,and the steel plate extrudes the channel steel,resulting in a decrease in the bearing capacity.However,the bearing capacity did not decrease much before the end of the test,so the steel plate has good ductility.2)Refined finite element model of three test specimens are established by Abaqus,and compare with the corresponding test results,to analyze the deformation,hysteretic behavior,skeleton curve and some other seismic behavior of the specimens.Research shows that,the hysteretic curves obtained by numerical simulation are slightly larger than the experimental results,but the shape of the hysteretic curves is basically the same.Moreover,the numerical simulation accurately tracks the stress state and the overall deformation of steel plate,the local deformation of butterfly-shaped links,therefore,abaqus is accurate enough to be used for analyzing the parameters of double-directional butterfly-shaped steel shear wall.3)The general finite element software Abaqus was used for parameter analysis based on the the above work to investigate the effects of the parameters of vertical butterfly plate and horizontal butterfly link on the seismic behavior of the steel plate wall.The results show that the load-carrying capacity of steel plate wall is influenced by the number of vertical butterfly plates m and depth-thickness ratio of the ends of the vertical butterfly plates ?,and increases with the increase of m and ?.The energy dissipation behavior of the steel plate wall is significantly affected by the number of horizontal butterfly links and the width-thickness ratio of the horizontal butterfly links.What's more,with the increase of the number of horizontal butterfly links,the hysteresis curve of the specimen becomes more plumb and the total energy consumption tend to improve while other parameters remain unchanged,only the width-thickness ratio is inclined,the energy dissipation of the specimen is briliantt in the early stages of loading,but the excessive out-of-plane deformation in the later loading stages restricts the energy dissipation ability.