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A new approach for estimating seismic damage of buried water supply pipelines

机译：一种估计地下供水管道地震破坏的新方法

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Conventional damage prediction methods for lifeline structures are primarily based on peak ground motion measurements. However, line structures such as lifelines suffer damage that is mainly induced by the strain of the ground and therefore are likely to be vulnerable to sharp spatial changes in the ground motion. In this study, we propose a measure for evaluating the damage incurred by underground water supply pipelines based on the spatial gradient of the peak ground velocity (PGV), in an attempt to quantify the effects of the geospatial variabilities in the ground motion on pipeline damage. We investigated the spatial distribution of the damage caused to water pipelines during the Niigata-ken Chuetsu earthquake on October 10, 2004 (Japan Meteorological Agency magnitude (M-JMA) of 6.8) and the Kobe earthquake on January 17, 1995 (M(JMA)7.3) and compared the surveyed damage with the PGV distribution as well as with the gradients of the PGV calculated around the damage areas. For the Kobe earthquake, we used the PGV distribution obtained by the strong-motion simulation performed by Matsushima and Kawase . In case of the Chuetsu earthquake, we estimated the ground motion using a broadband-frequency-based strong-ground-motion simulation method based on a multiasperity source model. In both cases, we calculated the gradients of the PGV along the geographical coordinates, with the amplitude of the PGV gradient vector being employed as the damage estimator. Our results show that the distribution of damage to underground water supply pipelines exhibits a greater correlation with the gradients of the PGV than with the PGV itself. Thus, the gradient of the PGV is a useful index for preparing initial-screening hazard maps of underground facilities. Copyright (c) 2017 John Wiley & Sons, Ltd.
机译：用于救生索结构的常规损坏预测方法主要基于峰值地面运动测量。但是，诸如救生索之类的线结构遭受的损坏主要是由地面的应变引起的，因此很可能容易受到地面运动中剧烈的空间变化的影响。在这项研究中，我们提出了一种基于峰值地面速度（PGV）的空间梯度来评估地下水供应管道造成的破坏的措施，以试图量化地面运动中的地理空间变化对管道破坏的影响。我们调查了2004年10月10日新泻县中越地震（日本气象厅6.8级）和1995年1月17日神户地震（M（JMA） ）7.3），并将调查到的损坏与PGV分布以及在损坏区域周围计算出的PGV梯度进行比较。对于神户地震，我们使用了由松岛和川濑进行的强运动模拟获得的PGV分布。在中越地震的情况下，我们使用基于多频度源模型的基于宽带频率的强地震动模拟方法估算了地震动。在这两种情况下，我们都沿地理坐标计算了PGV的梯度，并且将PGV梯度向量的幅度用作了损害估计量。我们的结果表明，与PGV本身相比，与PGV的坡度相比，对地下水供应管道的破坏分布具有更大的相关性。因此，PGV的梯度对于准备地下设施的初步筛查危险图很有用。版权所有（c）2017 John Wiley＆Sons，Ltd.

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