Numerical Study on Behavior of Double-superimposed RC Shear Wall Under Axial Compression and Bending Combination

Double-superimposed reinforced concrete shear wall (DRCSW) is a semi prefabricated shear wall structure, which is constituted by two prefabricated panels and cast-in-situ concrete layer. These three parts of concrete are connected by truss. To study the behavior of DRCSWs under axial compression and bending combination, ABAQUS has been used in this paper. Some tested specimens of DRCSW have been predicted to calibrate the numerical modelling method adopted and parameter studies have been carried out. The parameters considered include concrete strength, axial force ratio, boundary elements construction method, overlapped reinforcement bar area and stirrup layout in boundary elements. It has been concluded that increasing axial compression ratio will increase the peak load of the wall and lateral stiffness before peak load while decrease the deformation capacity of the wall. The change of concrete strength on the DRCSW under high axial compression ratio is more obvious than that under low axial compression ratio. The peak load and deformation capacity of the walls are almost the same no matter the boundary element is precast or cast-in-site. The DRCSW with prefabricated boundary elements is more favorable for structure industrial manufacture. Increasing the overlapped reinforcement bar area in the wall boundary elements will slightly improve the bearing capacity of the wall but increase the capacity degradation ratio after the peak load and the damage zone will transfer from the wall bottom to the upper end area of the overlapped reinforcement bar. Increasing the stirrup ratio can improve the deformation capability of the DRCSW.