| In order to speed up the construction period, improve the working efficiency and realize the green construction, the prefabricated construction is the inevitable trend of the development of the construction industry in our country. Structures with passive energy devices can effectively reduce the seismic response, and improve the structural seismic performance. This paper presents a novel buckling-restrained steel plate shear wall with inclined slots(simply referred as “slotted SPSW”) that can be used as an energy dissipation device. The slotted SPSW consists of boundary members and a steel plate with inclined slots sandwiched between two external concrete panels that provide lateral restraints for the inner steel plate. The steel strips between the inclined slots behave like a series of struts to dissipate energy through inelastic axial deformations of the steel strips during reversal loading, and therefore the load-carrying mechanism of slotted SPSWs is clear. The lateral resistance and stiffness can be adjusted easily by changing the number of inclined slots(n) and strip depth(b) for a fixed steel plate thickness. In this dissertation, the slotted SPSWs are mainly employed to study load-carrying mechanism, seismic performance and design method by the way of combined theoretical and experimental research, and the following issues are investigated:(1) The slotted SPSW is proposed based on the load-carrying mechanism of the unstiffened steel plate shear wall. The general shear force-drift relationship of the slotted SPSW is provided by theoretical derivation. The numerical models of slotted SPSWs are developed using the finite element analysis software ABAQUS/Explicit, and then parametric analyses are carried out on slotted SPSWs to check for the effect of those key parameters, such as the steel plate slenderness ratio(λ=h/t), the aspect ratio(l/h), the width of inclined slots(s) and the width of the steel strips(b). Based on the simplified analysis model of steel shear wall—Tension Strip Model, the equivalent model of the slotted SPSW is proposed. The differences between the equivalent model and the fine model are comprehensively compared and studied. Based on the monotonic load displacement curve, the accuracy of the model is evaluated, and then the equivalent model is tested by the internal force calculation and section design of the structure.(2) To avoid the occurrence of shear buckling failure, two external concrete panels are used to provide the out-of-plane restraints to the inner steel plate. Based on the theoretical studies, the concrete panel thickness(tc) and local plate slenderness ratio(d/t) have great influence on the stability of slotted SPSWs. The buckling, monotonic pushover and quasi-static cyclic analyses are conducted to investigate the stability of slotted SPSWs. Some key parameters, such as the gap between steel plate and concrete panels, bolt spacing, width of steel strips, and steel panel slenderness, are investigated through numerical analyses. The minimum concrete panel thickness for providing the effective lateral restraint to prevent buckling failure of the inner steel plate is determined based on the bolt spacing.(3) A half-scale slotted SPSW quasi-static cyclic test was carried out to provide the data about the general behavior of the slotted SPSWs. According the deformation characteristics of the specimens, the shear resistance, ductility and energy dissipation characteristics are studied. Also, according the experimental phenomena, the load-carrying mechanism and failure mode are analyzed, and then the effectiveness of the theoretical analysis is verified. The flexural stiffness of frame column have great influence on the shear resistance and energy dissipation of slotted SPSWs, the design proposal of the column is provided based the parametric analyses, and then which is verified by a full-scale slotted SPSW quasi-static cyclic test.(4) By considering the contribution of boundary frame to the bearing capacity in dual lateral force resisting system, the design of slotted SPSW system can be optimized. Firstly, the numerical models of slotted SPSW system are developed and then parametric analyses are carried out on slotted SPSWs to study the general behavior, stiffness and shear distribution between shear wall and frame in different load stage, and then quantify the contribution of boundary frame. Secondly, plastic collapse mechanism for SPSWs subjected to lateral loads have been investigated, and the section design equation of VBE considering axial force is derived through the mechanical analysis of horizontal boundary elements(HBE) and vertical boundary elements(VBE), and the shear distribution equation between infill panel and boundary frame is confirmed. The slotted SPSW structures were designed by the design method considering boundary frame, and seismic performances are evaluated by the nonlinear time history method. |
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