This paper describes an investigation on the seismic behaviour of a new lateral resistance system which combines semi-rigid steel frames (SRSFs) with steel plate shear walls (SPSWs). A laboratory test, including two 1/3-scale one-bay, two-storey SRSFs with SPSWs, was conducted to study the influence of the stiffeners on SPSWs and the stiffness of beam-column connections. The results indicate that the new system inherits the merits both of SRSFs and SPSWs. It exhibits excellent seismic performance in terms of load carrying capacity, ductility, stiffness and energy dissipation. The stiffeners on SPSWs not only effectively reduce the forces taken by beams and columns but also improve the overall cyclic performance of structural systems. Moreover, they increase the initial stiffness and buckling load capacity of SPSWs especially. Further, the finite element analysis method was adopted for parametric study of the influence of connection stiffness and stiffener rigidity on the behaviour of SRSF-SPSW. It demonstrates that the SPSW in the proposed structural system undertakes 70%-80% of overall lateral load. The influence of connection stiffness on the load carrying capacity depends on the stiffness of columns and thickness of infill plates. This influence is enlarged with increasing stiffness of columns and reducing thickness of infill plates. The load carrying capacity of a structural system is increased by 42.2% when connections are changed from pin to rigid. Generally, this research provides a basis for engineering application and theoretical analysis of the SRSF-SPSW structural system.
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