Research on tension-bending performance of steel plate concrete composite shear walls

Abstract

As large tensile stress may occur in the bottom core tube walls of high-rise buildings, elasto-plastic finite element analysis model of steel plate concrete composite shear walls(SPCW) were established to fully study the seismic behavior of SPCW under tension-bending condition. Axial tension ratio definition was proposed and influences of axial tension ratio on SPCW were researched including lateral stiffness, hysteretic curve, equivalent viscous damping coefficient, displacement ductility factor, deformation capacity and bearing capacity. Under tension-bending stress, bearing capacity of SPCW has no obvious decrease at ultimate deformation and SPCW has full hysteretic curves and large deformation ability. The SPCW bearing capacity and displacement ductility factor decrease with the increase of tension ratio. When the tension ratio is greater than 0.2, initial lateral stiffness is decreased by more than 50%. The lateral stiffness decreases with the increase of reversed horizontal loading. Results of sealed SPCW specimen tests under low-cycle and reverse horizontal loading show that multiple horizontal through-depth cracks appear on the specimen surface and rebars fracture at root finally. The measured SPCW bearing and ultimate deformation capacities agree well with the elasto-plastic finite element analysis. The SPCW has good bearing and deformation capacities and can become an effective method to solve the excessive tension stress under earthquake action in super high-rise buildings.