Study on the shear mechanism and resistance of single-side concrete-encased composite plate shear wall

Abstract

Concrete-encased composite plate shear walls (C-PSW/CEs) are effective structural elements for the lateral load-resisting. With the restraints from concrete panels and headed studs, the shear yielding of infill steel plate can be realized. In service, concrete panel can also provide a significant shear resistance to C-PSWCEs. Especially for the single-side concrete-encased ones, the post-buckling strength for the local buckling of steel plate can be utilized in ductility. However, research on the in-plane behavior of concrete panel or the post-buckling behavior of steel plate in the single-side C-PSW/CE is limited. In this paper, the shear behavior of single-side C-PSW/CE under lateral loading was studied by experiment and finite element analysis. The damage process and shear resistance of C-PSW/CE with different concrete thicknesses were tested. The extended finite element method (XFEM) was employed in the finite element model (FEM) to simulate the cracking of concrete panel. The internal forces in the horizontal and inclined cross sections of steel plate and concrete panel and in the pure shear zones and diagonal tension fields of steel plate were investigated to reveal the shear mechanisms of C-PSW/CE. Based on the parametric analysis results, formulas for the shear stiffness and yield shear force and a mechanics-based model for the shear force-drift ratio response of single-side C-PSW/CE were proposed.