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Performance of low-frequency structures incorporated with rate-independent linear damping

机译：结合速率无关线性阻尼的低频结构的性能

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摘要

This study examines the performance of rate-independent linear damping incorporated into a low-frequency structure subjected to strong ground motion. Linear viscous damping and rate-independent linear damping are known to yield similar response displacements and velocities during earthquakes. If the central response frequency is close to the fundamental frequency of the structure, the two linear damping elements yield almost identical damping forces. However, if the two frequencies differ significantly, these two damping elements yield substantially different damping forces, resulting in substantially different floor-response accelerations, The benefit of rate-independent linear damping in a low-frequency structure is that it yields relatively low floor response accelerations, even when the structure is subjected to ground motion containing high-frequency components. In contrast, linear viscous damped structures can suffer high accelerations induced by high damping forces caused by high-frequency components in ground motion. Thus, rate-independent linear damping is expected to be more effective in controlling floor-response accelerations without increasing the response displacements. To simulate the behavior of rate-independent linear damping for practical applications, both active and passive methods are proposed. We found that a passive model containing a Maxwell element and a negative stiffness element in parallel is a viable option for mimicking the behavior of rate-independent linear damping and thereby improving the seismic performance of low-frequency structures subjected to strong ground motion.
机译：这项研究研究了在强烈地面运动的低频结构中引入与速率无关的线性阻尼的性能。已知线性粘滞阻尼和与速率无关的线性阻尼在地震期间会产生相似的响应位移和速度。如果中心响应频率接近结构的基频，则两个线性阻尼元件会产生几乎相同的阻尼力。但是，如果两个频率显着不同，则这两个阻尼元件会产生实质上不同的阻尼力，从而导致实质上不同的地板响应加速度。低频结构中与速率无关的线性阻尼的好处在于，它会产生相对较低的地板响应即使结构经受包含高频分量的地震动时，加速度也可以减小。相反，线性粘性阻尼结构会受到地面运动中高频分量引起的高阻尼力引起的高加速度。因此，在不增加响应位移的情况下，与速率无关的线性阻尼有望在控制楼层响应加速度方面更加有效。为了模拟实际应用中与速率无关的线性阻尼行为，提出了主动和被动方法。我们发现，并行包含麦克斯韦元素和负刚度元素的被动模型对于模拟独立于速率的线性阻尼行为，从而改善受到强烈地面运动的低频结构的抗震性能，是一种可行的选择。

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