Abstract
Shear panel dampers (SPDs) are widely used in eccentrically braced composite frames (EBCFs) to effectively increase their stiffness and strength and dissipate input energy through plastic deformation in seismic conditions. However, these vertically installed SPDs could also impose an additional bending moment and axial forces on the composite beam in the frame, thus damaging the concrete slab of the frame. The SPDs used in this study were bent in the middle and connected to the web of the composite beam in the frame to overcome the drawbacks of traditional SPDs. Therefore, the resulted bending moment and axial force by the SPDs can be minimized, thus controlling the damage to the concrete slab. In this study, the cyclic behavior of the bent SPDs (BSPDs) made of low-yield-point steel is experimentally studied. Twelve specimens were designed and tested under quasi-static hysteretic loading to investigate the influence of web thickness, constrained flange, out-of-plane buckling restraint, and BSPD length ratio on the mechanical properties of BSPDs. Furthermore, the failure modes and hysteretic force–displacement curves of BSPDs made of low-yield-point steel are obtained through the tests. Finally, finite element models were established to simulate the cyclic behavior of BSPDs and analyze the key factors affecting the mechanical properties of BSPDs.
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