Hysteretic Behavior Of A Grid-reinforced Corrugated Steel Plate Shear Wall

In order to further improve the lateral performance and seismic capacity of steel plate shear walls(SPSWs),a new type of grid-reinforced corrugated steel plate shear walls(CSPSWs)is proposed.The entire corrugated wall panel is divided into several small wall panels embedded within the sub-frame,while the sub frame works together with the embedded wall panel,forming an overall lateral resistance system with the boundary frame.Based on the finite element numerical analysis,four models of shear walls namely the conventional flat SPSW,the conventional CSPSW,the grid-reinforced flat SPSW and the gridreinforced CSPSW,are established to analyze the hysteretic performance under cyclic loading,by comparing the stress development,out-of-plane deformation hysteretic curves and equivalent damping ratios.Meanwhile the internal forces of the boundary frame columns namely the axial force,shear force and bending moment are compared between the four models.Lastly,the effects of key parameters such as the number of embedded wall panels and grids as well as the material strength of different parts and rib stiffness ratio,on the hysteretic performance,stress development and the bearing capacity of the structure are discussed.It is found that,the sub-frame improves the hysteretic performance including the lateral strength,ductility,and energy dissipation of SPSWs by reducing the pinch of hysteretic curve of the conventional flat SPSW and the degradation of lateral resistance of the conventional CSPSW.In addition,under the maximum storey drift ratio,insignificant out-of-plane deformation occurs in the grid-reinforced CSPSW,which improves the comfortability of commonly use.Moreover,due to the action of sub-frame and embedded wall panels,the shear distribution of the boundary frame columns of grid-reinforced SPSW and CSPSW is more uniform,and the additional bending moment caused by "tension field" is significantly reduced as well.By decreasing the number of embedded wall panels,and increasing the number of subframe grids can reduce the degradation of the lateral resistant capacity of the CSPSW.When higher strength steel is used in the boundary frame and sub-frame,the bearing capacity and seismic performance of the system can be significantly improved;With the increase of rib stiffness ratio,the bearing capacity of the wall plate is enhanced effectively,and the threshold rib stiffness ratio should be satisfied in design.Overall,grid-reinforced CSPSWs can yield reasonable yield order from the embedded steel plate to the sub-frame frame then to the boundary frame,and effectively reduce the area of the yield zone of the boundary frame,leading to good lateral resistance and energy dissipation ability.