• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Dynamic soil-structure interaction: Pile foundations and retaining structures.
【24h】

Dynamic soil-structure interaction: Pile foundations and retaining structures.

机译：动态的土-结构相互作用：桩基和挡土结构。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This thesis deals with two important topics in soil-structure interaction: seismic earth pressures against rigid walls and the seismic response of pile foundations. These two disparate problems are linked by a common method of solution which is an approximation to the response of the half-space, either linear or non-linear.; The approximate formulation permits analytical solutions against rigid walls when the backfill is uniform and elastic. The solution agrees very closely with an existing exact solution. For elastic non-homogeneous backfills and for non-linear soil response the approximate formulation is expressed using the finite element method.; An efficient computer program SPAW has been developed to determine dynamic thrusts and moments against rigid walls for arbitrary non-homogeneous soil layers. Results of analyses show that the peak dynamic thrusts are larger for a uniform soil profile than when the shear modulus of the soil varies linearly or parabolically with depth. The program SPAW also possesses the ability of modelling the effect of soil non-linearity on dynamic thrusts. Studies showed that an increase of peak dynamic thrust may be expected due to soil non-linearity, compared with results from a linear elastic analysis.; A quasi-3D finite element method of analysis has been proposed to determine dynamic response of pile foundations subjected to horizontal loading. A computer program PILIMP has been developed for the analyses of elastic response of pile foundations including the determination of pile impedances as a function of frequency. The analysis is conducted in the frequency domain. The program can analyze single piles and pile groups in arbitrary non-homogeneous soil layers.; Another quasi-3D finite element computer program PILE3D has been developed for the analysis of non-linear response of pile foundations in the time domain. The program is suitable of dynamic analyses of single piles and pile groups. The soil non-linearity during shaking is modelled using a modified equivalent linear method. Yielding of the soil is taken into account and there is a no-tension option controlling the analysis.; The proposed quasi-3D model has been validated using the elastic solutions from Kaynia and Kausel (1982), Novak and Nogami (1977) and Novak (1974), Fan et al. (1991), data from full scale vibration tests of a single pile and a 6-pile group, and data from centrifuge tests of a single pile and a 2 x 2 pile group under strong shaking from simulated earthquake. Excellent results have been obtained using the proposed method. Time-dependent variations of dynamic impedances of pile foundations during shaking have been evaluated for the model pile foundations used in the centrifuge tests. The analyses quantify the reduction in the stiffnesses of the pile foundations with the increased level of shaking. The translational stiffness {dollar}ksb{lcub}vv{rcub}{dollar} decreases the most during strong shaking; the rotational stiffness {dollar}ksb{lcub}thetatheta{rcub}{dollar} decreases the least. However, the damping of pile foundations increases with the level of shaking.
机译：本文涉及土壤-结构相互作用的两个重要主题：刚性墙的地震土压力和桩基的地震反应。这两个截然不同的问题通过一种通用的求解方法联系在一起，该求解方法近似于线性或非线性半空间的响应。当回填物均匀且有弹性时，近似的配方可以对刚性壁进行分析。该解决方案与现有的精确解决方案非常吻合。对于弹性非均质回填和非线性土体响应，近似公式使用有限元法表示。已经开发出了一种有效的计算机程序SPAW，用于确定任意非均质土层对刚性墙的动态推力和力矩。分析结果表明，与土壤的剪切模量随深度线性或抛物线变化时相比，均匀土壤剖面的峰值动态推力更大。 SPAW程序还具有对土壤非线性对动力推力的影响进行建模的能力。研究表明，与线性弹性分析的结果相比，土壤非线性可能会导致峰值动态推力的增加。提出了一种拟3D有限元分析方法来确定水平荷载作用下桩基的动力响应。已经开发了计算机程序PILIMP，用于分析桩基的弹性响应，包括确定桩阻抗随频率的变化。分析在频域中进行。该程序可以分析任意非均质土层中的单个桩和桩组。已开发了另一个准3D有限元计算机程序PILE3D，用于分析桩基在时域中的非线性响应。该程序适用于单桩和桩组的动态分析。使用改进的等效线性方法对振动过程中的土壤非线性进行建模。考虑到土壤的屈服，并且有一个无张力的选项控制分析。拟议的3D模型已使用Kaynia和Kausel（1982），Novak和Nogami（1977）和Novak（1974），Fan等人的弹性解进行了验证。 （1991年），单桩和6桩组的全尺寸振动测试数据以及模拟地震作用下在强烈震动下的单桩和2 x 2桩组的离心试验数据。使用所提出的方法已经获得了极好的结果。对于离心试验中使用的模型桩基，已经评估了桩基在振动过程中随时间变化的动态阻抗。分析量化了随着振动水平的增加，桩基刚度的降低。在强烈晃动期间，平移刚度{dollar} ksb {lcub} vv {rcub} {dollar}下降幅度最大；旋转刚度{ksb {lcub} thetatheta {rcub} {dollar}最小。但是，桩基础的阻尼随着振动的程度而增加。

著录项

  • 作者

    Wu, Guoxi.;

  • 作者单位

    The University of British Columbia (Canada).;

  • 授予单位 The University of British Columbia (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 220 p.
  • 总页数 220
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号