Abstract: Double-steel-plate composite shear wall, consisting of bilateral steel plates, in-filled concrete, and mechanical connectors between steel plates, has many advantages such as light weight, high compression, high ductility, thin wall, good seismic performance, and higher prefabrication rate. With the continuous improvement of building height and functional requirements, it has been widely used and developed.
This paper summarized the research status of the axial compression performance of double-steel-plate composite shear wall and introduced several prevailing mechanical connector types including shear studs, binding bolts, hybrid connections, new mechanical connections, and so on. Then focusing on the axial compression performance, which is the basis of complex mechanical properties such as earthquake resistance and shear resistance, the change laws of axial compression bearing capacity and failure modes under the influences of different mechanical connector types and parameter variables were analyzed and summarized. The initial stiffness, limiting value of distance-to-thickness ratio(the ratio of connector distance to steel plate thickness), and calculation theory of axial compression capacity for double-steel-plate composite shear wall were also analyzed. Finally, this paper pointed out some problems in the current research from five aspects:theoretical studies, mechanical connectors, connecting joints, construction applications, and durability, and gave a prospect on the future development trend of double-steel-plate composite shear walls in high-rise buildings.
Based on the analysis of current research status, it is concluded that:the buckling of steel plate is the key factor to determine the axial compressive bearing capacity of double-steel-plate composite shear wall, and according to the value of distance-to-thickness ratio, the failure modes of double-steel-plate composite shear wall are divided into two cases:the steel plate buckles before yielding, and the steel plate buckles after yielding. In engineering practice, it is required to avoid the failure mode in which the steel plate buckles before yielding by changing the distance-to-thickness ratio. Arranging a certain amount of mechanical connectors along the height and width of the wall specimen can make full use of the material properties of concrete, prevent the brittle failure caused by the steel plate buckling, improve the axial compression bearing capacity and ductility of the specimen, and ensure that the wall stiffness remains almost constant until failure.