Research On Seismic Behavior Of Double Steel Plate-Concrete Coupled Shear Wall Structure

Double steel plate-concrete coupled shear wall(DSCW) is the new seismic lateral force resisting system, composed of steel beam and double steel plate composite shear wall. The mechanical behavior and seismic performance of the DSCW are studied by experimental method, theoretical analysis and numerical simulation method. Major research work and achievements of the dissertation are as follows:(1) One specimen subjected to cyclic lateral loading was tested, the test results indicate that the specimen fail in axial-flexural mode, characterized by failure of coupling beams, local buckling of boundary steel tubes and steel plates, followed by the compressive crushing of concrete at the wall base. Simplified formulation was proposed to evaluate the lateral load-carrying capacity of the DSCW, which provided satisfactory predictions.(2) Finite element model was constructed and validated through comparisons to test data. Monotonic pushover analyses were performed to investigate the effects of key parameters on seismic behavior of composite coupled walls. These parameters include boundary constraints, coupling beam types and coupling ratios.(3) Finite element models of concrete filled steel tubular frame-double steel plate composite shear wall structure were constructed, monotonic pushover analyses and seismic fragility analysis were performed to investigate the effects of the layout of the shear wall and the degree of coupling(DC). The results show that this structure system exhibited robust seismic behavior. Comparing with the planar shear wall structure, coupled shear wall structure, which in the reasonable DC, exhibited better ductility and capacity of energy dissipation through the yield of the coupling beams. In addition, exceed probabilities relevant to severe damage criterions can be reduced effectively by using coupled shear wall.(4) Elastic time-history analysis and elastic-plastic time-history analysis were carried out on a mega concrete filled steel tubular frame-double steel plate composite shear wall core wall structure. These analysis were aimed to investigate the characteristic of internal force distribution, the structure failure mechanism and so on. The results show that, under the severe earthquake, the structural damage was mainly concentrated on the coupling beams instead of the shear wall. The failure mechanism of the structure was “coupling beams→shear wall→frame”, fully embodied the theory of multi-line to defend earthquake.