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

  • Ping Liu
  • Ning LiEmail author
  • Hua Ma
  • Lili Xie
  • Baofeng Zhou
Article

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.

Keywords

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

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Copyright information

© Institute of Engineering Mechanics, China Earthquake Administration 2020

Authors and Affiliations

  • Ping Liu
    • 1
    • 2
  • Ning Li
    • 1
    • 3
    Email author
  • Hua Ma
    • 4
  • Lili Xie
    • 5
  • Baofeng Zhou
    • 5
  1. 1.School of Civil Engineering /Key Laboratory of Coast Civil Structure SafetyMinistry of Education (Tianjin University)TianjinChina
  2. 2.Ren’ai CollegeTianjin UniversityTianjinChina
  3. 3.Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration (Tianjin University)TianjinChina
  4. 4.Key Laboratory of Engineering and Structural RetrofitBeijing University of TechnologyBeijingChina
  5. 5.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering MechanicsChina Earthquake AdministrationHarbinChina

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