Friction mechanism and experimental investigation of the response-amplified friction damper
Friction mechanism and experimental investigation of the response-amplified friction damper
复制标题
响应放大摩擦阻尼器的摩擦机理及实验研究
DOI：
10.1002/stc.2953
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发表时间：
2022
影响因子：
5.4
通讯作者：
Yanmin Li
中科院分区：
文献类型：
--
作者：
Guifeng Zhao;Yuhong Ma;Zhenyu Yang;Qiang Wang;Yanmin Li
建筑物在强震或近断层地震下可能需要很大的阻尼力，而现有的摩擦阻尼器仍然需要较高的预紧力才能提供足够的反作用力。为了在较小的预紧力下提供较大的阻尼力，基于滚珠丝杠副的放大机构，结合摩擦阻尼器和惯性装置的优点，提出了一种新型的响应放大摩擦阻尼器。从理论上推导了RAFD的摩擦机理和恢复力公式，并进行了不同参数的拟静力试验。最后，以单自由度结构为例，比较了RAFD和传统摩擦阻尼器在不同水平地震作用下的减震效果。结果表明，RAFD具有明显的摩擦放大效应，显著降低了单自由度结构的地震反应。特别是预紧力仅为2 kN的摩擦阻尼器比预紧力高达20 kN的传统摩擦阻尼器具有更好的减振效果。通过拟静力试验，推导出的理论模型能够较准确地描述RAFD的滞回行为。RAFD中较小的差距可以进一步提高响应缓解的有效性。
Buildings may need large damping force under severe or near‐fault earthquakes, while existing friction dampers still need a high preload to provide enough reaction forces. In order to provide large damping forces at a small preload, this study proposes a new type of response‐amplified friction damper (RAFD) based on the amplification mechanism of a ball screw pair that combines the advantages of a friction damper and inerter device. The friction mechanism and the restoring force formula of the RAFD were derived theoretically, then pseudo‐static tests with various parameters were conducted. Finally, a single‐degree‐of‐freedom (SDOF) structure was employed to compare the effectiveness of the RAFD with a conventional friction damper under various earthquake levels. The results show that the RAFD has a significant friction amplification effect and significantly reduces the seismic responses of the SDOF structure. Particularly, the proposed RAFD with preload only 2 kN results in better effectiveness than the conventional friction damper with preload up to 20 kN. According to the pseudo‐static tests, the derived theoretical model can accurately describe the hysteresis behavior of the RAFD. A smaller gap in the RAFD can further improve the effectiveness in response mitigation.