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首页> 外文会议>NATO advanced research workshop on coupled site and soil-structure interaction effects with application to seismic risk mitigation >LOCAL SITE EFFECT EVALUATION IN SEISMIC RISK MITIGATION
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LOCAL SITE EFFECT EVALUATION IN SEISMIC RISK MITIGATION

机译：地震风险缓解的局部网站效应评估

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The response of a site to a seismic solicitation depends on local topographical and geomechanical characteristics. This paper deals with the evaluation of seismic site effects due to the local topographical and geomechanical characteristics and tries to contribute to establishment of a simple method to evaluate site effects. The amplification of surface motions is calculated by a numerical tool, HYBRID software, combining finite elements in the near field and boundary elements in the far field (FEM/BEM). In this paper, horizontal ground movements in various points of 2D empty valleys with irregular configurations subjected to synthetic SV waves of vertical incidence are calculated. Parametric studies are done on slopes, ridges and different shapes of canyons to characterize topographical site effects. The second part deals with sedimentary valleys. The complexity of the combination of geometrical and sedimentary effects is underlined. Extensive parametrical studies are achieved to discriminate the topographical and geotechnical effects on seismic ground movement amplifications in two-dimensional irregular configurations. The results are also shown in the form of pseudo-acceleration response spectra. For the empty valleys, we can classify the spectral response according to a unique geometric criterion: the "surface/angle" ratio, where surface is the area of the valley opening, and angle denotes the angle between the slope and horizontal line in the above coin. To assess the influence of the two dimensional effect on the spectral response of filled valleys, the response of alluvial basins are compared with the response of one-dimensional columns of soil. Finally, an offset criterion is proposed to choose a relevant computation method for the spectral acceleration at the surface of alluvial basins. The accuracy of this quantitative evaluation technique is tested and discussed.
机译：站点对地震征集的响应取决于局部地形和地质力学特性。本文涉及由于当地地形和地质力学特性而评估地震现场效应，并试图建立一种评估现场效应的简单方法。表面运动的放大由数值工具，混合软件，组合在远场中的近场和边界元件中的有限元组合（FEM / BEM）。在本文中，计算了在2D空谷的各个点的水平接地运动，计算了经受垂直发射合成的SV波的不规则配置。参数研究是在斜坡，脊和不同形状的峡谷上进行的，以表征地形现场效果。第二部分涉及沉积山谷。下划线了几何和沉积效应组合的复杂性。实现了广泛的参数研究以区分了二维不规则配置中地震地面运动扩增的地形和岩土工程。结果也以伪加速度响应谱的形式显示。对于空谷，我们可以根据独特的几何标准对光谱响应进行分类：“表面/角度”比率，在谷开口的面积中，角度表示上面的斜坡和水平线之间的角度硬币。为了评估二维效应对填充谷的光谱响应的影响，与土壤一维柱的响应进行了比较了冲积盆地的响应。最后，提出了偏移标准，以选择用于加容域表面的光谱加速度的相关计算方法。测试并讨论了这种定量评估技术的准确性。

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