RESEARCH ON SEISMIC BEHAVIOR OF L-SHAPED CONCRETE-FILLED STEEL TUBES COLUMN FRAME-BUCKLING RESTRAINED STEEL PLATE SHEAR WALLS

Abstract

Frame buckling restrained steel plate shear walls (BRSPSWs) have been widely used in high-rise residential buildings. L-shaped concrete-filled steel tube (CFT) columns were used in the frame in this research to investigate the impact of the frame members type in the BRSPSWs system. A nonlinear finite element model (NFEM) was generated to examine the seismic performance of BRSPSWs with various types of connections to the frame elements. The NFEM results were compared to test results to make them more reliable, and the comparison showed that the NFEM can predict the seismic behavior of BRSPSWs. Then based on the validated NFEM results, several parameters were analyzed in parametric studies to assess their impact on the performance of BRSPSWs, including leg's length, column's width-to-thickness, axial compression ratio, and height-to-thickness of the steel plate, concrete panel's thickness, and bolt arrangement. The effect of these parameters on lateral resistance and yield stiffness was reported and discussed. A theoretical model has also been proposed based on modified plate-frame interaction (MPFI) to calculate the yield lateral resistance of BRSPSWs. The outcomes of MPFI were validated through testing and NFEM findings, and the comparison revealed reasonable concurrence.