| Steel structure was comprehensively applied to modern architecture based on its good seismic performance. The steel framework composite steel plate shear wall(CSPSW) is a new type of structure system. This structure effectively makes up the defect that the lateral stiffness of steel frame is insufficient. Compared with reinforced concrete shear wall, the composite steel plate shear wall has good ductility and deformation capacity. It can avoid the defect that the wall is easy to crack. Compared with the steel plate shear wall, the reinforced concrete plate in the composite steel plate wall can effectively restrain buckling of the steel plate, improve strength, stiffness and hysteretic energy dissipation capacity of the structure.Many experts and scholars have launched a series of theoretical and experimental researches for composite steel plate shear wall at home and abroad. But the research focused more on the wall while the study was less for the seismic behavior after the steel frame joining with the composite wall. And the research on the role of reinforced concrete plate is inadequate. Therefore, carrying out seismic performance experimental research of the steel frame- composite steel plate shear wall structure is significant for the development of composite structure at present.As a new type of composite lateral resistance system, the steel frame-composite steel plate shear wall(CSPSW) structure increases the lateral stiffness of traditional moment resistant steel frame. In order to study the seismic behavior of CSPSW structure, a two-story, one bay specimen was designed and tested under cyclic load, after that the general behavior, local response and force distribution of the specimen were evaluated. The results show that CSPSW structure has high lateral bearing capacity and high safety factor. The ultimate lateral baring capacity is 4.47 times of the design lateral load. The CSPSW structure has well ductility and energy dissipation. The general ductility coefficient is 3.85, the power consumption ratio is 438.71% and the layer combination steel wall of the structure was main body of deformation and energy dissipation. According to the function of the components, the lateral load transfer way of SCSW is put forward as: the steel frame transfers lateral load to the simplified model of composite wall by splice bars; the simplified model transfers the load down to the frame by bridle bars; the frame then transfers the load down to the basement by the deformation itself. The steel framework undertakes 73%-84% of the whole overturning moment and the infill wall takes 82%-96% of overall lateral load. This was consistent with the design expectations of the structure.The theory and experiment contrast analysis of the buckling resist mechanism shows that the reinforced concrete cover plates were the important part of CSPSW structure. It has the effect of plate buckling resisted. According to the deformation pattern and stress response of the structure, the buckling single-wave changed to multi-wave due to the effect of surface outside support of the reinforced concrete cover plate. The stress response of the composite steel plate shear wall approximates in a plane stress state. Through the experiment comparison of the composite steel plate shear wall and steel plate shear wall, setting the reinforced concrete cover plate on both sides of the steel plate can effectively resist the buckling of the plate. The bearing capacity of the steel plate shear wall increased 95%. The hysteretic curve avoided the pinch shrinkage effect. And the hysteretic energy dissipation ability is enhanced.In this paper the seismic performance of CSPSW structure and the buckling resist ability of cover plate were analyzed. It is a supplement to the research of composite steel plate shear wall on the current. The research can provides a theoretical reference for guiding engineering design and also laid a solid foundation for the further study of CSPSW structure. |
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