铅-U型环金属阻尼器分级耗能机制与抗震性能研究OACHSSCD

This paper proposes a novel lead and U-shaped metal damper(LUD),which utilizes the synergistic interaction of lead blocks and U-shaped rings to achieve graded energy dissipation under multi-level seismic excitations.The lead blocks provide stable energy dissipation at small deformation stages,while the U-shaped rings primarily dissipate energy at large deformation stages.The force-de-formation skeleton curve and a two-stage hysteretic model for the LUD damper are established.A re-fined finite element model is developed in ABAQUS to validate the accuracy of the theoretical model.Furthermore,an analysis of the mechanical performance differences between the lead blocks and U-shaped rings is conducted,revealing their energy dissipation characteristics at different deformation stages.Finally,through dynamic response analysis of a five-story frame structure equipped with the LUD damper under frequent,design-basis,and rare earthquake intensities,the effectiveness of the damper in mitigating seismic responses under multi-level earthquakes and the applicability of its di-verse installation configurations are verified.