1. Relative energy zero ratio-based approach for identifying pulse-like ground motions.
- Author
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Liu, Ping, Li, Ning, Ma, Hua, Xie, Lili, and Zhou, Baofeng
- Subjects
MOTION ,SEISMIC response ,SURFACE waves (Seismic waves) ,ROTATIONAL motion - Abstract
Pulse-like ground motions are capable of inflicting significant damage to structures. Efficient classification of pulse-like ground motion is of great importance when performing the seismic assessment in near-fault regions. In this study, a new method for identifying the velocity pulses is proposed, based on different trends of two parameters: the short-time energy and the short-time zero crossing rate of a ground motion record. A new pulse indicator, the relative energy zero ratio (REZR), is defined to qualitatively identify pulse-like features. The threshold for pulse-like ground motions is derived and compared with two other identification methods through statistical analysis. The proposed procedure not only shows good accuracy and efficiency when identifying pulse-like ground motions but also exhibits good performance for classifying records with high-frequency noise and discontinuous pulses. The REZR method does not require a waveform formula to express and fit the potential velocity pulses; it is a purely signal-based classification method. Finally, the proposed procedure is used to evaluate the contribution of pulse-like motions to the total input energy of a seismic record, which dramatically increases the seismic damage potential. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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