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首页> 外文学位 >Dynamic theory of mixtures and its finite element implementation for nonlinear analysis of ground motion induced by seismic shaking.
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Dynamic theory of mixtures and its finite element implementation for nonlinear analysis of ground motion induced by seismic shaking.

机译：混合动力理论及其在地震振动引起的地震动非线性分析中的有限元实现。

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摘要

Soils exhibit pronounced nonlinear behavior under cyclic loading conditions. For saturated granular soil deposits, the analysis of ground movement due to earthquake shaking is more complicated since it is often followed by the buildup of excess pore water pressure. In this thesis, a finite-element (FE) model is proposed for effective stress analysis of perfectly saturated soils to seismic shaking. The formulation is based on theory of mixtures in which the soil is modeled as a two-phase medium composed of interacting solid and fluid phases. The finite element model is based on a general u-w-p formulation, where u is the solid displacement, w is the relative displacement of the fluid phase to that of the solid phase, and p is the pore pressure. The soil skeleton is modeled as a hyperelastic-plastic material with ellipsoidal bounding and loading surfaces. The FE model is implemented into a time-domain FORTRAN code SPECTRA-UWP with "stick" finite elements to accommodate vertically propagating seismic waves. SPECTRA-UWP is used to analyze the M6.2 earthquake of July 30, 1986 and the M7.0 earthquake of November 15, 1986 at a Large-Scale Seismic Test site in Lotung, Taiwan. Predicted responses in the form of ground surface accelerations and excess pore pressures are shown to replicate the recorded responses quite well. For the ground motions considered the coefficient of permeability and drainage boundaries have a direct impact on the predicted excess pore pressures but have little effect on the acceleration-time responses.
机译：在循环荷载条件下，土壤表现出明显的非线性行为。对于饱和的颗粒状土壤沉积物，由于地震震动引起的地层运动的分析更为复杂，因为通常会导致孔隙水压力过高。本文提出了有限元（FE）模型，用于对饱和饱和土进行地震振动的有效应力分析。该配方基于混合物理论，其中将土壤建模为由相互作用的固相和液相组成的两相介质。有限元模型基于一般的u-w-p公式，其中u是固相位移，w是液相相对于固相的相对位移，p是孔隙压力。土壤骨架被建模为具有椭圆形边界和加载表面的超弹塑性材料。有限元模型被实现为时域FORTRAN代码SPECTRA-UWP，带有“粘”有限元以适应垂直传播的地震波。 SPECTRA-UWP用于分析台湾罗东的大型地震试验场在1986年7月30日发生的M6.2地震和1986年11月15日发生的M7.0地震。以地面加速度和过大的孔隙压力形式的预测响应显示出可以很好地复制记录的响应。对于考虑的地面运动，渗透系数和排水边界对预测的超孔隙压力有直接影响，但对加速时间响应影响很小。

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  • 作者

    Lin, Chao-Hua.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 187 p.
  • 总页数 187
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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