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Relative energy zero ratio-based approach for identifying pulse-like ground motions

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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.

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Author information

Correspondence to Ning Li.

Additional information

Supported by: National Natural Science Foundation of China under Grant Nos. 51378341, 51427901 and 51678407, and National Key Research and Development Program under Grant No. 2016YFC0701108

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Cite this article

Liu, P., Li, N., Ma, H. et al. Relative energy zero ratio-based approach for identifying pulse-like ground motions. Earthq. Eng. Eng. Vib. 19, 1–16 (2020). https://doi.org/10.1007/s11803-020-0544-3

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Keywords

  • pulse-like ground motion
  • velocity pulse
  • relative energy zero-crossing ratio
  • short-time input energy
  • short-time zero crossing rate