Twenty-Four Centrifuge Tests to Quantify Sensitivity of Lateral Spreading to Dr and PGA
Twenty-Four Centrifuge Tests to Quantify Sensitivity of Lateral Spreading to Dr and PGA
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量化横向扩散对 Dr 和 PGA 的敏感性的 24 次离心测试
DOI：
10.1061/9780784481486.040
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Madabhushi, Gopal S.
中科院分区：
文献类型：
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作者：
Kutter, Bruce L.;Carey, Trevor J.;Zheng, Bao Li;Gavras, Andreas;Stone, Nicholas;Zeghal, Mourad;Abdoun, Tarek;Korre, Evangelia;Manzari, Majid;Madabhushi, Gopal S.
作为国际LEAP努力（液化实验和分析项目）的一部分，在世界各地9个不同的土工离心设施进行了24次离心模型试验。所有离心机模型代表4 m深5度倾斜的水下砂存款。所有实验的输入运动的平均有效PGA约为0.15 g，平均相对密度约为65%，但有效PGA在约0.07 g和0.3 g之间变化，相对密度在约40%和75%之间变化。测试矩阵的设计，使实验不仅量化的中位数响应，而且趋势和灵敏度的模型响应密度和震动强度。量化对初始条件的响应的灵敏度是客观评价模型试验数据质量的先决条件。换句话说，两个实验之间的差异应在考虑初始条件的不确定性和响应对初始条件的敏感性后进行评估。对于第一次，足够数量的实验已经进行了类似的问题，以提供有意义的定量评估PGA，密度和位移之间的趋势。灵敏度通过趋势的梯度量化，趋势的不确定性通过拟合数据与趋势之间的残差量化。
Twenty-four centrifuge model tests have been conducted at nine different geotechnical centrifuge facilities around the world as part of the international LEAP effort (liquefaction experiments and analysis projects). All of the centrifuge models represent a 4 m deep 5 degree sloping submerged sand deposit. The mean effective PGA of the input motion for all of the experiments was approximately 0.15 g and the mean relative density was approximately 65%, but the effective PGA’s varied between about 0.07 g and 0.3 g, and the relative densities varied between about 40% and 75%. The test matrix was designed to enable experimental quantification of not only the median response but also the trend and sensitivity of the model response to density and shaking intensity. Quantification of the sensitivity of the response to initial conditions is a prerequisite for objective evaluation of the quality of the model test data. In other words, a discrepancy between two experiments should be evaluated after accounting for the uncertainty in the initial conditions and the sensitivity of the response to initial conditions. For the first time, a sufficient number of experiments has been performed on a similar problem to provide meaningful quantitative evaluation of the trend between PGA, density, and displacement. The sensitivity is quantified by the gradient of the trend and the uncertainty of the trend is quantified from the residuals between the fitting data and the trend.