Published: Građevinar 77 (2025) 10
Paper type: Scientific research paper
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Experimental study on seismic performance of adaptive damper

To address the challenges of irreversible structural plastic deformation in traditional building seismic designs and the significant stiffness degradation of existing metal dampers, this study proposes an adaptive damper support based on multistage X-shaped steel plate bending deformation. By implementing a contact mechanism, the proposed adaptive damper enables the coordinated energy dissipation of X-shaped steel plates at different stages, thereby achieving stiffness superposition and staged yielding. Using low-cycle repeated pseudo-static tests and finite element numerical simulations, the hysteretic characteristics, stiffness degradation patterns, and energy dissipation capacities of the specimens were systematically investigated. The results demonstrate that as the displacement increases, the adaptive damper sequentially activates multi-stage energy-dissipating units, with the hysteretic curve exhibiting multi-peak characteristics. The equivalent viscous damping coefficient shows stage-wise fluctuations with increasing displacement. Further, the stiffness degradation process is triggered by the contact mechanism, and follows an alternating evolution pattern of degradation and enhancement to effectively balance the requirements for energy dissipation and stiffness retention. This study provides a theoretical basis for a novel adaptive energy-dissipating device for structural seismic designs.

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