Experimental and numerical study on seismic performance of square and L-shaped Concrete-filled steel tubes column Frame-Buckling steel plate shear walls

To boost the application of concrete-filled steel tubes (CFTs) in high-rise buildings, square and L-shaped CFT are used as boundary columns in frame-buckling steel plate shear walls (SPSWs). This study presents an eco-friendly and sustainable solution for using tailings and recycled aggregate concrete as the infill concrete in CFT columns. Cyclic quasi-static tests are performed on two one-span, two-story specimens. A four-corner gusset connection connects the shear wall to the boundary columns. Subsequently, the failure modes, hysteretic curves, and characteristic capacities are analyzed. The failure and hysteretic behaviors of the two tested specimens are simulated using the finite element (FE) software ABAQUS and verified against the experimental results. Based on validated models, parametric studies are established and analyzed. The results imply that the frame-buckling SPSW exhibits good seismic performance. The failure modes of the two specimens are similar; however, the specimen using the L-shaped column exhibits more excessive deformation. In addition, the use of an L-shaped column increases the bearing capacity and ductility by approximately 10 %; simultaneously, the stiffness in-creases by 30 %. The buckling of the steel plates primarily consumes seismic energy. The results of this study can be used as a reference for engineering practice.