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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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。

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	蒲武川
	薛耀辉
	张孟成

关键词 ：脉冲型地震动, 高通滤波, 非因果性滤波, 脉冲周期, 最低可用频率

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.

Key words： impulsive ground motion high-pass filtering non-causal filtering pulse period lowest usable frequency

收稿日期: 2018-12-20 出版日期: 2020-06-28

引用本文:

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. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(13): 116-124.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I13/116

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