Modelling non-linear ground response of non-liquefiable soils
Modelling non-linear ground response of non-liquefiable soils
复制标题
DOI：
10.1002/(sici)1096-9845(200001)29:1
复制
发表时间：
2000-01-01
影响因子：
4.5
通讯作者：
Masada, GM
中科院分区：
文献类型：
--
作者：
Borja, RI;Lin, CH;Masada, GM
提出了一个非线性有限元 (FE) 模型来解释土柱对强烈地震动的影响。制定了适用于不可液化土壤的具有消失弹性区域的三维边界面塑性模型，以适应加载开始时塑性变形的影响。弹塑性本构模型是在有限元土柱模型框架内铸造的，用于重新分析 5 月 20 日地震期间台湾罗东大型地震试验 (LSST) 现场阵列记录的井下运动1986；以及 1989 年 10 月 17 日 Loma Prieta 地震期间在 Gilroy 2 参考点记录的地面运动。分析结果显示，Lotung 事件中土柱所经历的最大永久剪切应变约为 0.15%，Loma Prieta 地震中为 0.8%，分别对应于约 30% 和 10% 的模量折减系数，这意味着土沉积物在两个站点。版权所有 (C) 2000 John Wiley & Sons, Ltd.
A non-linear finite element (FE) model is presented to account for soil column effects on strong ground motion. A three-dimensional bounding surface plasticity model with a vanishing elastic region, appropriate for non-liquefiable soils, is formulated to accommodate the effects of plastic deformation right at the onset of loading The elasto-plastic constitutive model is cast within the framework of a FE soil column model, and is used to re-analyse the downhole motion recorded by an array at a Large-Scale Seismic Test (LSST) site in Lotung, Taiwan, during the earthquake of 20 May 1986; as well as the ground motion recorded at Gilroy 2 reference site during the Loma Prieta earthquake of 17 October 1989. Results of the analysis show maximum permanent shearing strains experienced by the soil column in the order of 0.15 per cent for the Lotung event and 0.8 per cent for the Loma Prieta earthquake, which correspond to modulus reduction factors of about 30 and 10 per cent respectively, implying strong non-linear response of the soil deposit at the two sites. Copyright (C) 2000 John Wiley & Sons, Ltd.