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The fluctuation-dissipation theorem used as a proxy for damping variation: in real engineering structures

机译：波动耗散定理用作阻尼变化的代名词：在实际工程结构中

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The damping ratio and the resonance frequency represent relevant health indicators in structural health monitoring, and they are key parameters in the design of buildings. The combination of two modal parameters (i.e., damping, frequency) is reported to vary in time due to changes in environmental conditions, and with damage to the structure and dynamic loading. Amplitude dependence of the damping and frequency parameters has also been reported for strong loading, such as strong winds. However, none of these reasons can explain the much higher fluctuations of the damping values compared to the resonance frequency in the amplitude range of natural ambient vibrations. The objective here is to investigate if any amplitude dependence in this lower range of loading can explain the observed differences in the scattering of these two modal parameters. To do so, the first approach consists of a study of vertical clamp-free beams made out of different materials. Secondly, the observations and interpretations obtained are scaled up to buildings under continuous monitoring. Finally, we consider the fluctuation dissipation theorem to explain these uncommon results.
机译：阻尼比和共振频率代表结构健康监测中的相关健康指标，它们是建筑物设计中的关键参数。据报道，由于环境条件的变化以及结构和动态载荷的损坏，两个模态参数（即阻尼，频率）的组合随时间变化。对于诸如强风之类的强载荷，也已经报道了阻尼和频率参数的幅度依赖性。但是，在自然环境振动的幅度范围内，与共振频率相比，这些原因都无法解释阻尼值的大幅波动。此处的目的是研究在此较低载荷范围内是否存在任何幅度依赖性，可以解释观察到的这两个模态参数的散射差异。为此，第一种方法包括研究由不同材料制成的垂直免夹梁。其次，将获得的观察和解释扩大到在连续监测下的建筑物。最后，我们考虑波动耗散定理来解释这些不常见的结果。

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