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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Near-field velocity pulse-like ground motions on February 6, 2018 M_w6.4 Hualien, Taiwan earthquake and structural damage implications
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Near-field velocity pulse-like ground motions on February 6, 2018 M_w6.4 Hualien, Taiwan earthquake and structural damage implications

机译：2018年2月6日台湾花莲M_w6.4地震的近场速度脉冲状地震动和结构破坏的影响

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The February 6, 2018 Hualien Taiwan Earthquake (M(w)6.4) had caused serious fatalities and severe building damages in Hualien city. Substantial near-field velocity pulse-like ground motions were probably one of the important factors. We used the continuous wavelet transforms method to identify the velocity pulse-like ground motions from orthogonal components of all the recorded ground motions. The identification results were in agreement with the contour map of pulse-like occurrence probability according to two prediction models for non-strike-slip faults. After verification using method based on the energy content of significant velocities pulses, 16 near-field recordings were recognized as the pulse-like ones, and the pulse period (T-p) was then determined individually. It was found that the extracted values of T-p were generally longer than the prediction value given by the empirical regression model based on the NGA-West2 dataset. The single and multiple degrees of freedom (SDOF and MDOF, respectively) systems were implemented in the computation of inelastic demand and story ductility demand. The results indicated the followings: (1) For the identified pulse-like records, the inelastic demand of SDOF with oscillator period T less than 0.6T(p) is much more significant than that for non-pulse-like records when the SDOF nonlinearity level increases. The mean inelastic displacement ratio curve is approximately one standard deviation higher than the mean prediction value in the 0.1 < T/T-p < 0.5 range. (2) The maximum ductility demand exists at the bottom story of the 7-story,9-story and 11-story MDOF structure subject to the pulse-like records. For the case of reduced shear strength and stiffness at the bottom story due to removed infill walls, the bottom ductility demand reach more than 10.0 under pulse-like records. These findings support the supposition that large ductility demand and the bottom soft-story mechanism under near-field velocity pulse-like ground motions were the main reasons for severe structural damage of the four near-field mid-rise RC buildings during the Hualien earthquake.
机译：2018年2月6日，花莲台湾地震（M（w）6.4）在花莲市造成了严重的死亡和严重的建筑破坏。大量近场速度脉冲状地震动可能是重要因素之一。我们使用连续小波变换方法从所有记录的地面运动的正交分量中识别出类似速度脉冲的地面运动。根据两个非走滑断层预测模型，识别结果与脉冲状发生概率轮廓图吻合。使用基于大速度脉冲的能量含量的方法进行验证后，将16个近场记录识别为脉冲状记录，然后分别确定脉冲周期（T-p）。已经发现，T-p的提取值通常长于基于NGA-West2数据集的经验回归模型给出的预测值。在计算非弹性需求和故事延性需求时实施了单自由度和多自由度（分别为SDOF和MDOF）系统。结果表明：（1）对于已识别的脉冲状记录，当SDOF非线性时，振荡器周期T小于0.6T（p）的SDOF的非弹性需求比非脉冲状记录的非弹性需求要大得多。级别增加。平均非弹性位移比曲线在0.1

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