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

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 116-124.

PU Wuchuan, XUE Yaohui, ZHANG Mengcheng

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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.

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impulsive ground motion / high-pass filtering / non-causal filtering / pulse period / lowest usable frequency

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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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