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Chapter 4.3 Recent Applications of Ambient Vibration Measurements in Croatia

机译：第4.3章环境振动测量在克罗地亚的最新应用

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The chapter describes recent applications of the measurements of ambient vibrations in Croatia. They include free-field measurements in Zagreb and Ston, as well as those done within buildings. Data obtained in the field at both localities are consistent with the properties of shallow geological structures known to exist there. In Zagreb, HVSR spectra indicate thick alluvial cover (over 100 m) that gradually gets thinner as one reaches the southernmost slopes of the Medvednica Mt. A similar situation, but on a smaller scale, is also encountered in Ston, where HVSR profiles reveal several tens of meters thick sedimentary cover over the bedrock which gets exposed at the Stovis hill. Measurements in the buildings were analysed by FREDA - a suite of Matlab routines that permit several modes of data analyses. Based on tests on synthetic and real data we conclude that spectral methods are in general more robust and less dependent on parameters of the respective algorithm, than time-domain analyses. Spectral algorithms are also much better in resolving higher modes. The random decrement method is in most cases found to be inferior to spectral or band-pass procedures using original signals. Applications to real buildings proved that analyses of shaking induced by ambient vibrations in most cases leads to well constrained, reliable, and time independent estimates of frequencies and damping of the buildings' vibrational modes.
机译：本章介绍了克罗地亚环境振动测量的最新应用。其中包括Zagreb和Ston的自由场测量以及建筑物内的自由场测量。在两个地方的现场获得的数据与已知存在于该处的浅层地质构造的性质是一致的。在萨格勒布，HVSR光谱显示厚的冲积层（超过100 m）随着到达Medvednica山的最南坡而逐渐变薄。在Ston，也遇到了类似的情况，但规模较小，那里的HVSR剖面显示出基岩上数十米厚的沉积覆盖层，该覆盖层暴露在Stovis山丘上。建筑物中的测量通过FREDA（一套Matlab例行程序进行分析）来进行多种数据分析模式。根据对合成数据和真实数据的测试，我们得出结论，与时域分析相比，频谱方法通常更健壮，并且对各自算法的参数的依赖性较小。频谱算法在解析更高模式时也要好得多。在大多数情况下，发现随机减量方法不如使用原始信号的频谱或带通过程。在实际建筑物中的应用证明，在大多数情况下，分析由环境振动引起的晃动会导致对建筑物的频率和阻尼的严格约束，可靠且时间独立的估计。

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