AXIAL COMPRESSION BEHAVIOR OF DOUBLE-SKIN COMPOSITE SHEAR WALL WITH T-STIFFENER AND HEADED STUD CONNECTORS

Double-skin composite shear walls (DSCSWs) offer high strength and improve construction processes in tall structures, offshore constructions, and nuclear power plants. This paper investigates the compressive performance of DSCSWs, which consist of concrete sandwiched between two external steel faceplates and bonded with connectors at regular intervals. Threedimensional finite element (FE) modeling is established and verified against five axial compression test specimens to predict the ultimate compressive capacity and failure modes of DSCSWs with bolts, head studs, and T-stiffener connectors. Parametric studies evaluate the impact of five factors on the compressive performance of DSCSWs. The results show that different connectors provide confinement to the concrete core, enhancing the compressive capacity of DSCSWs, with Tstiffeners being the most effective. Furthermore, variations in the thickness of the steel plates, concrete core, and height of the walls significantly affect the strength and ductility of DSCSWs, while changes in bolt spacing have insignificant effect. Finally, the ultimate compressive capacity of DSCSWs is calculated using code equations and an analytical method. The prediction results show a good correlation with the numerical results. These findings provide valuable insights for implementing DSCSWs in engineering applications, particularly in design for practical use.