Evaluation performance for site amplification factors: S-wave impedance vs. V30
Evaluation performance for site amplification factors: S-wave impedance vs. V30
复制标题
现场放大系数的评估性能：S波阻抗与V30
DOI：
10.1016/j.sandf.2018.05.001
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发表时间：
2018
影响因子：
3.7
通讯作者：
S. Sawada
中科院分区：
文献类型：
--
作者：
Y. Shingaki;H. Goto;S. Sawada
简化的回归模型，以评估场地放大被广泛采用的地震小区划图，设计规范，等等。在实践中，用于控制评价模型的最流行的参数是顶部zm深度的平均S波速度VSz，特别是VS 30。最上层与基层的S波阻抗比IS 1/IS 0是替代的评估参数。在这项研究中，我们比较VSz和IS 1/IS 0的SH波放大因子的数值实验的基础上，人工生成的土壤剖面的评价性能。取平均横波速度，必须根据场地放大系数的目标周期范围选择深度z。IS 1/IS 0的性能与VS 10相似，但在峰值地面加速度（PGA）和短周期范围（0.1-0.5 s）方面优于VS 30。这意味着，IS 1/IS 0是有效的用于现场放大评估，因为IS 1只需要一个物理参数的最上层的表面层。
Simplified regression models to evaluate site amplification are widely adopted for seismic microzonation maps, design specifications, and so forth. In practice, the most popular parameter for controlling the evaluation models is an averaged S-wave velocity of top zm depth, VSz, especially VS30. The S-wave impedance ratio of the uppermost layer to the base layer, IS1/IS0, is an alternative evaluation parameter. In this study, we compare the evaluation performance of VSz and IS1/IS0 for SH wave amplification factors on the basis of numerical experiments on artificially generated soil profiles. Taking the average S-wave velocity, depth z must be selected on the basis of the target period range of the site amplification factors. IS1/IS0 is found to perform similarly to VS10, and it is better than VS30 for the peak ground acceleration (PGA) and the short-period range (0.1–0.5 s). This implies that IS1/IS0 is effective for use in site amplification evaluations because IS1 only requires a physical parameter on the uppermost surface layer.