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.

中文翻译：

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基于相对能量零比的识别脉冲状地面运动的方法

脉冲状的地震动能够对结构造成重大破坏。在近断层地区进行地震评估时，对脉冲状地震动的有效分类非常重要。本文基于地面运动记录的短时能量和短时过零率两个参数的不同趋势，提出了一种识别速度脉冲的新方法。定义了一种新的脉冲指示器，即相对能量零比（REZR），以定性地识别类似脉冲的特征。推导出类似脉冲的地面运动的阈值，并通过统计分析将其与其他两种识别方法进行比较。所提出的程序不仅在识别脉冲状地面运动时显示出良好的准确性和效率，而且在分类具有高频噪声和不连续脉冲的记录时也表现出良好的性能。REZR方法不需要使用波形公式来表示和拟合势速脉冲。它是一种纯粹基于信号的分类方法。最后，所提出的程序用于评估脉冲状运动对地震记录总输入能量的贡献，从而大大增加了地震破坏的可能性。