A point-estimate based method for soil amplification estimation using high resolution model under uncertainty of stratum boundary geometry
A point-estimate based method for soil amplification estimation using high resolution model under uncertainty of stratum boundary geometry
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DOI：
10.1016/j.soildyn.2018.11.028
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发表时间：
2019-06
影响因子：
4
通讯作者：
K. Iiyama;Atsushi Yoshiyuki;K. Fujita;T. Ichimura;H. Morikawa;M. Hori
中科院分区：
文献类型：
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作者：
K. Iiyama;Atsushi Yoshiyuki;K. Fujita;T. Ichimura;H. Morikawa;M. Hori
该研究为在地层边界几何形状不确定的情况下随机估计土体放大提供了一种实用的方法。为了评估模糊性下土体非线性响应的可能值，采用高分辨率三维有限元模型进行非线性动力分析是可取的，尽管计算仍然是一项严格的任务。本文对Rosenblueth的点估计方法（PEM）进行了改进，该方法在计算时间上有很大的优势，并证明了与蒙特卡罗方法相比，该方法可以以很少的计算量提供很好的估计。为了对地面反应进行随机评价，还研究了优选的概率密度函数。此外，还讨论了超出概率的估计精度和所提方法的局限性。
This study provides a practical technique for stochastically estimating soil amplification under uncertainty of the geometry of stratum boundary. To evaluate the possible values of the non-linear soil response under ambiguity, a nonlinear dynamic analysis with a high resolution 3D-FEM model is preferable, although the computations still represent a rigorous task. This study modifies Rosenblueth's point estimate method (PEM), which is greatly advantageous from the viewpoint of computational time, and demonstrates that the proposed method can provide good estimations with a very small number of calculations compared to the Monte-Carlo method. To evaluate the ground response stochastically, the preferable probability density function (PDF) is also examined. Furthermore, the estimation accuracy of the exceedance probability and the limitations of the proposed method are also discussed.