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首页> 外文会议>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：地震风险缓解中的局部场地效果评估

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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：场地对地震的反应取决于当地的地形和地质力学特征。本文探讨了由于局部地形和地质力学特性而引起的地震现场效应的评估，并试图为建立评估现场效应的简单方法做出贡献。表面运动的放大率是通过数字工具HYBRID软件计算的，该工具结合了近场中的有限元和远场中的边界元（FEM / BEM）。在本文中，计算了在垂直入射的合成SV波作用下具有不规则构造的2D空谷的各个点的水平地面运动。在坡度，山脊和不同形状的峡谷上进行了参数研究，以表征地形站点的影响。第二部分涉及沉积谷。强调了几何和沉积作用相结合的复杂性。进行了广泛的参数研究，以区分地形和岩土工程对二维不规则构造中地震地面运动放大的影响。结果也以伪加速响应谱的形式显示。对于空谷，我们可以根据唯一的几何标准对光谱响应进行分类：“表面/角度”比，其中“表面”是谷开口的面积，而“角度”表示上面的坡度与水平线之间的角度硬币。为了评估二维效应对填充谷光谱响应的影响，将冲积盆地的响应与一维土柱的响应进行了比较。最后，提出了一种偏移准则，为冲积盆地表面的光谱加速度选择一种相关的计算方法。测试并讨论了这种定量评估技术的准确性。

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