| The concrete-filled square steel tube frame-thin steel plate shear walls has good application in tall buildings for its good load carrying capacity, lateral stiffness, good ductility and energy dissipation capacity. Openings in steel plate shear walls in buildings are provided for architectural reasons. The middle opening will influence the seismic behavior and failure mechanism. By using experimental research and theoretical research, this dissertation study on the seismic behavior of the concrete filled square steel tube frame-thin steel plate shear walls with middle opening.The main works are listed as follows:(1)A total of 2 pseudo-static experiments were conducted concrete-filled square steel tube frame with thin steel plate shear walls(SPSW). The influence of middle opening of steel plate shear wall on the seismic behavior was investigated for concretefilled square steel tubular frame-thin steel plate shear walls. The load-displacement hysteretic loops, skeleton curves, the load and displacement values for different loading stages and seismic behavior index were obtained. The failure characteristic, ductility, energy dissipation capacity, load carrying and stiffness degeneration were studied. The experimental results show that the concrete filled square steel tube frame-thin steel plate shear walls have good load carrying capacity, lateral stiffness and energy dissipation capacity. The opening of steel plate shear walls decreases the load carrying capacity and lateral stiffness. The stiffeners around the openings decrease the height-to-thickness ratio of infill plates. The mechanical behavior of steel plate shear wall is improved.(2)By using the finite element software ABAQUS, The influence of the location of the opening, the ratio of opening width, the axial compression ratio, the width-to-height ratio and the column rigidity on the seismic behavior were investigated. The analytical results show that the location of the opening has less influence on the load capacity and the energy dissipation capability of the SPSW. SPSWs experience a progressive reduction in their stiffness, strength and energy dissipation capability with an increase of the ratio of opening width and decreases of the width-to-height ratio. The decrease of the axial compression ratio and the column rigidity will decline both the ultimate strength and the energy dissipation capability of the SPSW.(3)The shear force-drift curve, and the interaction between the SPSW and frame members are studied. A very high contribution from the SPSW up to a drift angle of around 0.2%. After the development of diagonal yield zones, the contribution of SPSW gradually decrease and after the drift angle of 1%, the surrounding members experience their first yield points, and they become almost constant. The analytical results show that the axial compression ratio has less influence on the shear force-drift curve. SPSWs experience a progressive reduction in their percentage of shear force with an increase of the ratio of opening width and decreases of the width-to-height ratio. The increase of the column rigidity will enhance the percentage of shear force of frame members.(4)Based on the numerical results and the analytical analysis, the simplified formula of the lateral force resistant capacity of the frame was proposed. The predictions obtained using the proposed formula correlate well with the numerical results. |
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