Study On Seismic Behavior Of Concrete-filled Rectangular Steel Tubular Frame-Steel Plate Shear Wall With Opening

Steel plate shear wall (SPSW) has good application in tall buildings for its excellent load capacity, ductility, energy dissipation and convenient construction. Using concrete-filled square steel tubes (CFTs) as the vertical boundary elements of the SPSW can combine the advantages of two structure elements, and fully develop the structural behavior of them. The layout of SPSWs is usually at the center of the structure. In order to meet the needs of architecture function, SPSWs may have opening for the elevator door or equipment pipes. The opening will influence the seismic behavior and failure mechanism. By using experimental research and theoretical analysis, this dissertation study on the seismic behavior of three types of concrete-filled square steel tubular frame (CFTF)-SPSW with opening. The main works are listed as follows:(1) The pseudo-static tests were conducted on three specimens of CFTF-SPSW with opening and one specimens of CFTF-SPSW. The seismic behaviors of CFTF-SPSWs with and without opening were investigated. The results show that CFTF-SPSWs with or without opening have great stiffness and load capacity. SPSWs with or without opening can make use of post-buckling strength of steel plate. The hysteretic curves of CFTF-SPSWs with and without opening form an’S’shape. The CFTF-SPSWs with or without opening has stable hysteretic behavior and good ductility. The cracks of steel plate appeared at the center and corner of steel plate first, and then the plastic hinge formed at column base. The experimental results indicate that CFTF-SPSW with opening is an effective lateral load resisting system.(2) Finite elements analyses on the behavior of experiment specimens were conducted by using the ABAQUS. The analysis results coincide with the experiment ones. The hysteretic behavior, deformation and stress development and failure mechanism of the SPSWs with opening were investigated. The analyses result showed that the increase of width-to-height ratio and decrease of width-to-thickness ratio will increase the stiffness of the model, horizontal load capacity and energy dissipation capability. The axial compression ratio has less influence on the stiffness, and the increase of axial compression ratio will decrease the load capacity and energy dissipation capability. The increase of opening ratio will decrease the load capacity. With the increase of opening ratio, the energy dissipation capability of SPSW with center opening will decrease, but the one of SPSW with side opening will increase. The opening height ratio has less influence on the stiffness and energy dissipation capability, and the increase of opening height ratio will decrease the load capacity.(3) In the standards and researches around the world, there isn’t any method to get the limit of column stiffness for SPSW which uses CFT as vertical boundary element. The limit value formula of stiffness on the vertical boundary element of CFT is put forward based on the thin web plate girder theory. The analyses results show that the CFT vertical boundary elements which are designed according to the above proposed formula could fully develop the structural behavior of the SPSWs, degrade the PS effect on CFT and achieve the desirable failure mechanism.(4) In order to make use of the post-buckling strength of steel plate, the stiffeners must be set at the edges of the opening wall. The buckle analyses, elas-to-plasticity analyses and pseudo-static analyses of three type of SPSWs with opening were conducted. The width and height of SPSWs have great influence on the effect of stiffeners. When the wall is wide or low, the less stiffness of stiffener can markedly increase the buckling load. The thickness of wall has less influence on the buckling load. The employ of stiffener can increase the stiffness, load capacity and energy dissipation capability of the SPSW with opening. When the stiffness of stiffener reaches a certain value, the increase of behavior of SPSW will be weakened. The formulas for calculating internal forces of stiffener in this dissertation can be used for checking the load capacity of stiffener, and the formula gives conservative result.