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Relative energy zero ratio-based approach for identifying pulse-like ground motions |
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| Authors: | Liu Ping Li Ning Ma Hua Xie Lili Zhou Baofeng |
| Institution: | 1.School of Civil Engineering /Key Laboratory of Coast Civil Structure Safety, Ministry of Education (Tianjin University), Tianjin, 300072, China ;2.Ren’ai College, Tianjin University, Tianjin, 301636, China ;3.Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration (Tianjin University), Tianjin, 300350, China ;4.Key Laboratory of Engineering and Structural Retrofit, Beijing University of Technology, Beijing, 100124, China ;5.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China ; |
| 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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