Near-fault pulse-like ground motion identification method based on non-causal filtering and zero- point method

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (19) : 71-79.

FENG Jun, ZHAO Boming, ZHAO Tianci

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Abstract

An algorithm for extracting the velocity pulse signal was proposed based on the Butterworth non-causal low-pass filter and the zero-point method, and the cut-off frequency of the filter is determined by the number of extreme points in the pulse signal. 666 records with peak ground velocities above 30 cm/s were utilized as training data. The identification criteria of single-pulse-like and double-pulse-like records based on the relative energy and amplitude of pulse signals were proposed. The pulse period was calculated by the duration of the most effective pulse. The comparison with the reference methods shows that the proposed pulse extraction method has a high fitting effect and can be used to extract asymmetric pulse signal and double-pulse signal; The proposed quantitative identification criteria can effectively identify single-pulse-like and double-pulse-like ground motions; The proposed pulse period calculation method can calculate the pulse periods of s single-pulse-like and double-pulse-like records.
Key words: near-fault ground motion; pulse-like ground motion; velocity pulse; pulse period; quantitative identification

Key words

near-fault ground motion / pulse-like ground motion / velocity pulse / pulse period / quantitative identification

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FENG Jun, ZHAO Boming, ZHAO Tianci. Near-fault pulse-like ground motion identification method based on non-causal filtering and zero- point method[J]. Journal of Vibration and Shock, 2022, 41(19): 71-79

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