过载防护型黏滞阻尼器的振动控制机理及试验研究
Vibration Control Mechanism and Experimental Investigation of Viscous Damper with Overload Protector
基于隔震支座和附加阻尼器的组合隔震系统可有效隔离地震作用,并一定程度控制隔震层变形响应。然而,在多水准地震作用下,基于传统黏滞阻尼器的组合隔震系统易呈现过高的阻尼控制力而削弱隔震效果。鉴于此,本文提出具有过载防护功能的黏滞阻尼器(VD-OP)及其组合隔震系统,开展了设计加工及试验测试工作,建立了基于试验数据校正的VD-OP非线性阻尼和过载防护特性的力学模型,明确了VD-OP组合隔震系统的隔震有效性和多水准振动控制优势。研究结果表明,本文所提出的VD-OP系统具有速度依赖的非线性阻尼机制和力限制功能,能够有效避免高水准地震作用引起的过大阻尼力,提高隔震效率,并控制隔震结构的加速度响应。本文提出的基于性能的设计方法可为VD-OP系统的实施提供实用指导,为高烈度区的结构减隔震设计提供参考。
A combined base-isolation system incorporating isolation bearings and additional dampers can effectively mitigate seismic forces and control the deformation response of the isolation layer to a certain extent. However, under multi-level seismic excitations, combined isolation systems employing conventional viscous dampers generate excessively high damping forces, which compromise the isolation effectiveness. To address this issue, a viscous damper with overload protection (VD-OP) and its corresponding combined isolation system are proposed in this study. The design, fabrication, and experimental testing of the VD-OP were conducted, and a mechanical model describing its nonlinear damping and overload protection characteristics was established based on experimental data calibration. The effectiveness of the VD-OP combined isolation system and its advantages in multi-level vibration control were verified. The results indicate that the proposed VD-OP system exhibits a velocity-dependent nonlinear damping mechanism and force-limiting capability, effectively preventing excessive damping forces induced by high-level seismic excitations, enhancing isolation efficiency, and controlling the acceleration response of the isolated structure. The performance-based design approach proposed in this study provides practical guidance for the implementation of VD-OP systems and offers a reference for the seismic mitigation design of structures in high-intensity seismic regions.
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科技部国家重点实验室基础研究资助项目(SLDRCE19-A-10)
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