To accommodate the installation space and energy dissipation requirements of the connection between modular units and additional lateral force-resisting systems, a novel scissor expansion joint (SEJ) suitable for such connections is proposed. The influence of the SEJ’s scissor mechanism geometry and initial gap on its seismic performance under both central and eccentric loading was investigated through theoretical analysis, experimental tests, and finite element analysis. The results indicate that the SEJ, through the coordinated interaction between the scissor mechanism and dampers, converts the concentrated load on the damper into a uniformly distributed load. This conversion amplifies the relative displacement of the SEJ and reduces the load demand on the damper. Under central loading, the experimental and finite element analysis results of the SEJ are in complete agreement with the theoretical restoring force model. Under eccentric loading, an increase in the loading eccentricity leads to a decrease in the initial stiffness of the SEJ. Increasing the thickness of the scissor mechanism effectively enhances the initial stiffness of the SEJ under eccentric loading. It also reduces the rigid-body rotation of the SEJ support, thereby improving its seismic performance. The proposed restoring force model accurately reflects the seismic performance of the SEJ under central loading and provides a reference for its promotion and application in practical engineering.
剪叉式伸缩缝的有限元分析共分为3个试验验证工况、6个中心加载工况和6个偏心加载工况.其中,工况M1-C~M6-C为有限元模型M1~M6的中心加载工况,工况M1-E300、M5-E300、M6-E300的加载偏心距为300 mm,工况M1-E600、M5-E600、M6-E600的加载偏心距为600 mm.各工况分别在参考点RP2(P1~P3位置)采用集中位移控制加载,中心加载工况、偏心加载工况的加载制度均为滞回加载,幅值均为±20 mm.
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