Cyclic tests of fully prefabricated concrete-filled double-skin steel tube/moment-resisting frames with beam-only-connected steel plate shear walls

This paper proposes a fully prefabricated concrete-filled double-skin steel tube/moment-resisting frame with beam-only connected steel plate shear walls system. To realize the fully prefabricated construction of such a system, high-strength bolts are used for the beam -to-column joints, the column-to-column joints and the frame-to-wall joints. To reduce the additional forces of the boundary columns that are derived from the tension force action of the buckled steel plate shear wall (SPSW), beam-only connected SPSWs are proposed for this system. To evaluate the seismic performance of the proposed system, cyclic tests on three 1/2-scaled specimens were conducted in this paper. The damage observation, failure mechanism, and hysteretic behaviour of the test specimens are investigated and compared. The results show that the beam-only-connected steel plate shear walls (BSWs) enhanced the lateral resistance, initial stiffness and ductility of the fully prefabricated concrete-filled double -skin steel tube/moment-resisting frames. The specimens with BSWs tolerated more than a 5% story drift ratio, which was larger than the value of the bare frame, which increased with increasing numbers of BSWs, and the increment between each specimen was approximately equal. A similar finding was also observed in the initial stiffness, lateral resistance and ductility ratio. Furthermore, theoretical formulas are developed to estimate the lateral resistance of the BSWs and the bolt connections between the frame and the BSWs, and these proposed formulas are validated by the test results.