+高级检索
水平力(H)-扭矩(T)组合受荷桩承载特性模型试验研究
DOI:
作者:
作者单位:

作者简介:

通讯作者:

基金项目:


Model Testing Investigation on Bearing Behavior of a Single Pile under Combined H-T Loads
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    为探讨单桩基础在桩顶水平力(H)-扭矩(T)组合作用下的承载特性,研制了H-T组合加载装置.通过室内砂箱模型对比试验,获得了8组H-T组合工况下的桩身内力变形与承载力结果.其表明:相比于单一水平受荷或受扭桩的极限承载力(Hu或Tu),两种荷载的不同大小组合与加载顺序(H→T或T→H)均会导致相应桩身承载力的减小,且H→T组合的影响要比T→H组合明显,如2Tu/3→T时桩身水平承载力减小约12.4%,而2Hu/3→T组合下桩身扭转承载力减幅达48.5%,故工程设计时不宜基于叠加原理计算H-T受荷桩的承载力.在此基础上,采用基于MATLAB编制的可考虑桩周土约束及H-T耦合效应的改进杆系有限元法计算程序求解了不同工况下的H-T组合受荷桩的桩顶扭转角及桩身扭矩与弯矩,并将计算结果与模型试验值进行了对比分析.

    Abstract:

    In order to study the bearing behavior of a single pile under combined loadings of horizontal force H and torque T, a loading device was first designed to apply H and T on the pile top simultaneously. 8 groups of indoor model were tested to obtain the inner forces and deformation as well as bearing capacities of the pile shaft. The result showed that, compared with the ultimate bearing capacity of pile shaft under pure H or T (i.e., Hu or Tu), the H-T load combinations with various magnitudes and sequences (i.e., H→T or T→H) caused an obvious decrease of the bearing capacity. For example, the application of 2Tu/3 on the pile top reduced the horizontal bearing capacity by 12.4 %, while the pre-loading of 2Hu/3 resulted in a reduction of the torsional bearing capacity up to 48.5 %. Therefore, traditional superposition principles can not be used in engineering design to evaluate the bearing capacity of piles under combined loads. Considering the effects of H-T combination and subsoil constraint on the torsional bearing capacity, the torsion angles at the pile top as well as the torque and moment distributions along the pile shaft were calculated by a MATLAB-based FEM program. The predictions were also compared with the model test data.

    参考文献
    相似文献
    引证文献
文章指标
  • PDF下载次数:
  • HTML阅读次数:
  • 摘要点击次数:
  • 引用次数:
引用本文

邹新军,丁仕进,赵灵杰.水平力(H)-扭矩(T)组合受荷桩承载特性模型试验研究[J].湖南大学学报:自然科学版,2017,44(3):126~133

复制
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2017-03-24
  • 出版日期:
作者稿件一经被我刊录用,如无特别声明,即视作同意授予我刊论文整体的全部复制传播的权利,包括但不限于复制权、发行权、信息网络传播权、广播权、表演权、翻译权、汇编权、改编权等著作使用权转让给我刊,我刊有权根据工作需要,允许合作的数据库、新媒体平台及其他数字平台进行数字传播和国际传播等。特此声明。
关闭