Experimental and numerical investigation of cross-shaped buckling-restrained SPSWs with composite structure

Abstract

The square concrete-filled steel tube (CFST) column enjoys the advantages of high bearing capacity, a simple structure of beam-column joints, good ductility and seismic performance. Therefore, the square CFST columns are introduced as the boundary frame of buckling-restrained steel plate shear wall (SPSW). To investigate the cyclic behaviour of cross-shaped buckling-restrained SPSW with a composite frame consisting of H-shaped steel beams and square CFST columns, two specimens were prepared and tested under the cyclic quasi-static loading, and the failure modes and hysteretic curves of the specimens were discussed. Experimental results show that the cross-shaped buckling-restrained stiffeners can significantly reduce the out-of-plane deformation of the steel plate and improve the bearing capacity of SPSW structures. The finite element (FE) models of SPSWs with cross-shaped stiffeners were developed, and good agreement was observed between the FE analysis results and test results for the failure modes, skeleton curves and bearing capacity. Based on the parameter analysis results of the cross-shaped buckling-restrained SPSWs structures, it is assumed that the strength of the embedded steel plate can be fully exerted when the flexibility coefficient of square CFST columns is no greater than 2.5. In addition, the design rules of the flexibility coefficient of square CFST columns were proposed to promote the application of SPSW buckling-restrained by cross-shaped stiffeners in high-rise buildings.