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Influence of long-period filter cut-off on elastic spectral displacements

机译：长周期滤波器截止对弹性谱位移的影响

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摘要

The effect of the long-period filter cut-off, T_c, on elastic spectral displacements is investigated using a strong ground-motion database from Europe and the Middle East. The relation between the filter and oscillator responses is considered to observe the influence of T_c for both analogue and digital records, and the variations with site classification, magnitude, filter order and viscous damping. Robust statistics are derived using the re-processed European data to generalize the effects of the long-period filter cut-off on maximum oscillator deformation demands as a function of these seismological and structural features. Statistics with a 95% confidence interval are derived to suggest usable period ranges for spectral displacement computations as a function of T_c. The results indicate that the maximum period at which spectral displacements can be confidently calculated depend strongly on the site class, magnitude and filter order. The period range where reliable long-period information can be extracted from digital accelerograms is twice that of analogue records.
机译：使用来自欧洲和中东的强大地面运动数据库，研究了长周期滤波器截止时间T_c对弹性光谱位移的影响。滤波器和振荡器响应之间的关系被认为可以观察到T_c对模拟和数字记录的影响，以及随位置分类，幅度，滤波器阶数和粘性阻尼的变化。使用经过重新处理的欧洲数据得出稳健的统计数据，以根据这些地震和结构特征将长周期滤波器截止对最大振荡器变形要求的影响进行概括。得出具有95％置信区间的统计数据，以建议频谱位移计算的可用周期范围是T_c的函数。结果表明，可以可靠地计算频谱位移的最大周期在很大程度上取决于站点类别，幅度和滤波器阶数。可以从数字加速度图中提取可靠的长期信息的周期范围是模拟记录的两倍。

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