摘要
在分析推扭荷载下群桩基础工作机理的基础上,根据静力平衡条件建立了以转心为参照点的各基桩位移及转角普适方程。采用p-y曲线法与单桩扭转刚度计算理论分别确定各基桩的水平刚度与扭转刚度,并提出了各计算参数的取值方法。然后,建立出推扭荷载群桩内力与位移的解算流程,编制了相应的计算程序。与试验数据的对比表明,文中方法计算结果与实测结果吻合较好,且计算过程简单,具有工程实用性。最后,采用计算程序对推扭耦合作用下群桩基础进行了失稳破坏分析。结果表明,当荷载偏心距变大时,同等量级荷载下群桩转角即随之增大,偏心距对承台转角的影响更明显,而影响群桩水平位移的主要因素则是水平荷载及桩头水平刚度。
On the basis of studying the bearing mechanism of pile groups subjected to the coupled load, a set of universal equations for computing displacements and rotation of each pile in the group, which rotates around a determined cen ter, were established based on the force equilibrium conditions. The p-y method and the torsion loaded pile theory were introduced to determine horizontal and torsional rigidity of each single pile respectively. Then, the computational method was programmed, and was applied in experimental data exploration. The comparison indicates that the method proposed was practicable and user-friendly. Lastly, the program was utilized to analyze load distribution of a coupled loaded pile group. The results are shown that the longer the eccentricity of the load is, the larger the rotation of the pile groups will be; and the bearing behavior of torsionally loaded pile group could be determined mainly on horizontal rigidity of each pile in the group.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第12期100-105,共6页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51478051
51408066)
湖南省交通科技计划(201014)
关键词
桩基础
耦合效应
水平荷载
扭矩荷载
非线性
pile foundation
coupling effect
horizontal load
torque
nonlinearity
