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Near-fault acceleration pulses and non-acceleration pulses: Effects on the inelastic displacement ratio

机译：近故障加速脉冲和非加速脉冲：对非弹性排量比的影响

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Near-fault ground motions can impose particularly high seismic demands on the structures due to the pulses that are typically observed in the velocity time-histories. The velocity pulses can be further categorized into either a distinct acceleration pulse (acc-pulse) or a succession of high-frequency, one-sided acceleration spikes (non-acc-pulse). The different characteristics of velocity pulses imply different frequency content of the ground motions, potentially causing different seismic effects on the structures. This study aims to investigate the characteristics of the two types of velocity pulses and their impacts on the inelastic displacement ratio (C-R) of single-degree-of-freedom systems. First, a new method that enables an automated classification of velocity pulses is used to compile a ground motion dataset which consists of 74 acc-pulses and 45 non-acc-pulses. Several intensity measures characterizing different seismological features are then compared using the two groups of records. Finally, the influences of acc-pulses and non-acc-pulses on the C-R spectra are studied; the effects of pulse period and hysteretic behavior are also considered. Results indicate that the characteristics of the two types of velocity pulses differ significantly, resulting in clearly distinct C-R spectral properties between acc-pulses and non-acc-pulses. Interestingly, mixing acc-pulses and non-acc-pulses can lead to local "bumps" that were found in the C-R spectral shape by previous studies. The findings of this study highlight the importance of distinguishing velocity pulses of different types when selecting near-fault ground motions for assessing the nonlinear dynamic response of structures.
机译：由于在速度时间历史中通常观察到的脉冲，近断层地运动可以对结构施加特别高的地震要求。速度脉冲可以进一步分类为不同的加速度脉冲（ACC脉冲）或连续的高频单侧加速峰值（非ACC脉冲）。速度脉冲的不同特性意味着地面运动的不同频率含量，可能导致结构不同的地震效应。本研究旨在研究两种类型的速度脉冲的特性及其对单级自由度系统的无弹性位移比（C-R）的影响。首先，使用能够自动分类速度脉冲的新方法来编译一个由74个ACC脉冲和45个非ACC脉冲组成的接地运动数据集。然后使用两组记录比较了表征不同地震学特征的几种强度措施。最后，研究了ACC-脉冲和非ACC脉冲对C-R光谱的影响;还考虑了脉冲周期和滞后行为的影响。结果表明，两种类型的速度脉冲的特性显着不同，导致ACC脉冲和非ACC脉冲之间明显不同的C-R光谱特性。有趣的是，混合ACC脉冲和非ACC脉冲可以通过先前的研究导致在C-R光谱形状中发现的本地“凸块”。本研究的结果突出了在选择近断层地运动时区分不同类型的速度脉冲的重要性，用于评估结构的非线性动态响应。

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