Abstract
This study proposes a novel prefabricated rectangular steel tube– concrete composite shear wall system, comprising square steel tube columns integrated with a concrete wall panel. Finite element simulations were performed to investigate the structural behaviour and assess the influence of key parameters, including steel tube strength, axial compression ratio, and shear-span ratio. The results demonstrate that the proposed shear wall exhibits a typical flexural–compression failure mode, characterized by yielding of the boundary steel tubes and localized buckling on the compression side. Parametric analyses reveal that increasing the steel tube strength significantly improves the load-bearing capacity, with both the characteristic load and corresponding displacement showing marked enhancement, thereby improving both strength and deformability. Higher axial compression ratios result in a steeper ascending branch in the load–displacement response, accompanied by reductions in yield and peak displacements. Moreover, while the ultimate load initially increases with axial compression ratio, it subsequently declines due to reduced confinement effectiveness and ductility. Conversely, an increased shear-span ratio leads to a decrease in peak load but enhances deformation capacity and overall ductility.