Experimental and Numerical Investigation of Steel Beam-to-CFST Column Frame-Thin Steel Plate Shear Walls with Cross Stiffness

摘要

Steel plate shear wall (SPSW) systems have been used increasingly in medium- and high-rise buildings in recent decades. Two major issues in the slender-web SPSW are the buckling of H-section steel column base and significant pinching in hysteretic curves. As a solution, SPSW using concrete-filled steel tubular (CFST) column and cross stiffeners was proposed in this paper. Cyclic tests of two specimens of 1/3 scaled steel beam-to-CFST column frame-thin SPSW with cross stiffeners or without stiffeners were conducted. Based on the verified finite element method, parametric investigations considering the effect of the flexural rigidity of CFST column, width-to-height aspect ratio, height-to-thickness ratio of infill steel plate and relative rigidity of cross stiffener were carried out. Findings show that SPSW using CFST column exhibited favorable ductility behavior with no sudden loss of lateral bearing capacity. Adding stiffeners to SPSWs relieves the pinching effect of hysteretic curves and reduces the maximum lateral displacement substantially. With stiffeners, the average yield load and the peak load of SPSWs were approximately 15% and 9% higher than that of the unstiffened specimens. Moreover, a flexural rigidity of CFST column of at least 2.5 and a stiffener rigidity of 30-50 were recommended to provide an economical and approving lateral bearing capacity.