Study on seismic performance of prefabricated CFST frames with beam-only-connected SPSWs
Zhang Zengde1 Wang Jingfeng1,2 Gong Xudong1 Zhao Chunfeng1 Li Beibei1
1. Hefei University of Technology, Hefei 230009, China;
2. Collaborative Innovation Center for Advanced Steel Structure Technology and Industrialization of Anhui, Hefei 230009, China
Abstract：The prefabricated concrete-filled steel tubular (CFST) frame structure with beam-only-connected steel plate shear walls (SPSWs) are composed of those frames of circular or square CFST columns and steel beams connected with blind high-strength bolts and endplates, and beam-only-connected SPSWs. In order to investigate the seismic response and failure mechanism of prefabricated CFST frames with beam-only-connected SPSWs, horizontal low-cyclic loading tests on two-truss single-bay specimens of prefabricated CFST frames with beam-only-connected SPSWs were carried out. The influences of column section type, connection between SPSWs and beam, and semi-rigid joint type on the failure modes and seismic performance of the structural systems were studied. The failure characteristics and development of the specimens were observed. Furthermore, the hysteretic responses, skeleton curves, degradation curves of stiffness, ductility, energy dissipation capacity and strain rules of main components were analyzed. The research results showed that prefabricated CFST frames with beam-only-connected SPSWs exhibited good hysteretic responses and energy dissipation capacity. Compared to the pure prefabricated CFST frame, the elastic stiffness and ultimate bearing capacity of these systems were improved by 163.8%~249.4% and 41.0%~97.1%, respectively. Subsequently, the nonlinear analysis odels of prefabricated CFST frames with SPSWs were established by OpenSees program. The accuracy of computational models was verified by test results, and these models laid the foundation for theoretical analysis of this structural system. The research results in this study shall be beneficial to the application and popularization of prefabricated CFST frames with SPSWs.
