高通滤波对近场脉冲型地震动位移反应谱的影响

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (13) : 116-124.

论文

蒲武川，薛耀辉，张孟成

作者信息 +

Effects of high-pass filtering on displacement response spectrum of near-field impulsive ground motion

PU Wuchuan, XUE Yaohui, ZHANG Mengcheng

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文章历史 +

摘要

长周期速度脉冲是近场脉冲型地震动的最重要特征之一，高通滤波会改变低频脉冲成分与其他频率成分的相对大小，进而影响地震动的反应谱形状。选取了一组近场脉冲型地震动，根据脉冲频率fp定义相对截止频率，考察高通滤波对弹性位移反应谱衰减的影响规律。通过数值分析比较了因果性滤波和非因果性滤波的区别，分析了相对截止频率对最低可用频率、脉冲属性判定和高阻尼比反应谱的影响。分析结果表明：相对截止频率越高，截止频率与最低可用频率的比例系数越小；当截止频率取0.4fp时，该比例系数与一般远场地震动结果相近；截止频率小于0.4fp时，脉冲属性和脉冲周期无显著变化。在长周期区段内，相对截止频率小于等于0.4fp时，阻尼比的影响可以忽略；相对截止频率大于0.4fp时，应考虑阻尼比的影响。

Abstract

Long period velocity pulse is one of the most important features of near-field impulsive ground motion. High-pass filtering can change relative proportion between low-frequency pulse components and other ones, and then affects response spectral shape of ground motion. Here, a set of near-field ground motions was chosen, the relative cut-off frequency was defined according to pulse frequency fp to investigate effect laws of high-pass filtering on elastic displacement response spectrum attenuation. Numerical analyses were performed to compare causal filtering and non-causal one, and analyze effects of the relative cut-off frequency on the lowest usable frequency, pulse attribute determination and response spectrum with high damping ratio. It was shown that the larger the relative cut-off frequency, the smaller the proportional coefficient of the relative cut-off frequency to the lowest usable one; when the relative cut-off frequency is taken as 0.4fp, the proportional coefficient is close to that for general far-field ground motions; when the relative cut-off frequency is smaller than 0.4fp, the pulse attribute and pulse period have no significant changes; within a long period range, when the relative cut-off frequency is equal to or less than 0.4fp, effects of damping ratio can be ignored, while when it is larger than 0.4fp, effects of damping ratio should be considered.

导出引用

蒲武川，薛耀辉，张孟成. 高通滤波对近场脉冲型地震动位移反应谱的影响[J]. 振动与冲击, 2020, 39(13): 116-124

PU Wuchuan, XUE Yaohui, ZHANG Mengcheng. Effects of high-pass filtering on displacement response spectrum of near-field impulsive ground motion[J]. Journal of Vibration and Shock, 2020, 39(13): 116-124

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