A dual-mode floor isolation system to achieve vibration isolation and absorption: Experiments and theory
A dual-mode floor isolation system to achieve vibration isolation and absorption: Experiments and theory
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DOI：
10.1016/j.jsv.2022.116757
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发表时间：
2022-01-29
影响因子：
4.7
通讯作者：
Harvey, P. S., Jr.
中科院分区：
文献类型：
--
作者：
Bin, P.;Harvey, P. S., Jr.
在地震发生时，建筑物内的运动敏感设备可以使用地板隔离系统（FIS）来保护免受地震干扰。当它在允许的间隙内位移时，它的响应是畅通的，但是当超过这个间隙时，FIS和位移极限之间就会产生影响。这种诱导的非线性可能会在主结构（PS）和FIS之间产生不可忽略的动力耦合，这可能会被调整以减少强震期间的PS响应。此外，减振器可以增加冲击时的耗散。本研究旨在评估FIS在低烈度地震作用下（即撞击前）的隔振性能和在高烈度地震作用下（即撞击后）的吸振性能。这种FIS被称为双模隔振/吸振系统，在评估隔振性能和吸振性能时，其量分别与峰值FIS加速度和峰值PS层间漂移有关。采用实验室规模的实验方法来研究FIS附着在PS的第二层时的性能，该PS受到四次历史地面运动的影响。对耦合非线性PS-FIS系统的数学模型进行了预测，并与实验结果进行了比较。实验和数值结果表明，该系统具有良好的双性能。
During the event of an earthquake, motion-sensitive equipment inside a building can be protected from seismic disturbance using a floor isolation system (FIS). Its response is unimpeded when it displaces within the allowable clearance, but when this gap is exceeded impacts are induced between the FIS and the displacement limit. This induced nonlinearity may create a non-negligible dynamic coupling between the primary structure (PS) and the FIS, which can possibly be tuned to reduce the PS responses during strong earthquakes. Moreover, the dissipation during impact can be augmented with a shock absorber. This research aims to evaluate the performance of the FIS as a vibration isolator when subjected to low-intensity earthquakes (i.e., before impact occurs) and as a vibration absorber when subjected to high intensity earthquakes (i.e., after impact occurs). Such a FIS is termed dual-mode vibration isolator/absorber system whose quantities of interest concern peak FIS acceleration and peak PS interstory drift when evaluating the isolation performance and the absorption performance, respectively. A lab-scale experimental approach is used to study the FIS performance when attached to the second story of the PS that is subjected to four historic ground motions. Predictions from a mathematical model of the coupled, nonlinear PS-FIS system are compared to the experimental results. The experimental and numerical data shows promising results that suggest the dual performance of the FIS is achieved.