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首页> 外文期刊>Bulletin of earthquake engineering >A period-dependent topographic amplification model for earthquake loss estimation
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A period-dependent topographic amplification model for earthquake loss estimation

机译：地震损耗估计的周期依赖性地形放大模型

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A review study is presented targeting the question how topographic amplification of strong earthquake ground motions is currently handled in literature and how this effect can be incorporated within earthquake loss estimation (ELE). An improved understanding of the phenomenon would also facilitate its inclusion in future building design code provisions in a more rigorous manner than present levels. Even though it is widely accepted that, in addition to soil conditions, surface topography can have considerable influence on the frequency and amplitude characteristics of earthquake ground motion, this effect has been neglected in all of the existing ELE software tools, and neither do ELE studies in general consider this effect. Therefore, after a detailed review of the existing literature, we have synthesized the results from some of the studies into a period-dependent topographic amplification relationship (including PGA) for sites at the top of a hill, which may be used in ELE studies. The relationship for an amplification factor, A(h), was obtained by fitting a database containing 333 data points, in which A(h) ranges from 0.31 to 3.04, and the shape relief (H/L) ranges from 0.25 to 0.8. Out of these, seven data points correspond to topographic amplification of PGA while the remaining data points correspond to amplification of the spectral acceleration at periods ranging between 0.065 and 3.91s. All the data stems from analytical/numerical studies and we have only considered the possibility of topographic amplification due to SV/SH waves with an incidence angle perpendicular to the base of the hill. The results show a reasonable correlation between the theoretical and the fitted data. We also have compared the amplification factors provided by our period-dependent relationships with the most recent experimental and numerical data for the Narni ridge (Italy) and found close similarities with these results. The proposed relationship can be used not only in ELE studies
机译：提出了一个审查研究，针对了如何在文献中处理强烈地震地面运动的地形放大以及如何在地震损失估算（ELE）中纳入这种效果。改善了对现象的理解也将促进其在未来的建筑物设计代码中的纳入，而不是更严格的方式而不是目前水平。尽管众所周知，除了土壤条件之外，表面形貌还可以对地震地面运动的频率和幅度特征具有相当大的影响，但在所有现有的ELE软件工具中都忽略了这种效果，并且既不是ELE研究一般认为这一效果。因此，在对现有文献进行详细审查之后，我们已经将一些研究的结果合成到山顶顶部的位置的时期依赖性地形放大关系（包括PGA），其可用于ELE研究。通过装配包含333个数据点的数据库获得的扩增因子（H）的关系，其中（H）范围为0.31至3.04，形状浮雕（H / L）范围为0.25至0.8。其中，七个数据点对应于PGA的地形放大，而剩余数据点对应于在0.065和3.91s之间的周期的频谱加速度的放大。所有数据源自分析/数值研究，并且我们仅考虑了由于SV / SH波引起的地形放大的可能性，其具有垂直于山座的底部的入射角。结果显示了理论和拟合数据之间的合理相关性。我们还将我们的时期依赖关系提供的放大因子与Narni Ridge（意大利）的最新实验和数值数据进行了比较，并发现了与这些结果的密切相似之处。拟议的关系不仅可以在ELE研究中使用

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