桥梁工程中刚性承台下桩的工作特性研究

将杆系结构有限单元法与荷载传递迭代法相耦合,形成一桩基沉降分析计算的混合法.采用近似解析解中RandolphandWroth'Model和双曲线模型相结合,模拟桩身与桩周介质边界上剪切滑移.桩间相互作用,在采用弹性理论Mindlin方程解答计算,并考虑了桩间"加筋与遮帘"作用.分析了刚性承台下群桩桩数、桩长、桩间距和桩土模量比等群桩工作特性的影响.

Study on behaviors of pile group under rigid cap in bridge Engineering

One hybrid method of finite element analysis of rod structure coupling with load transfer approach for piles groups settlement was estabished.The behavior of shear-diaplacement of the boundary between pile and ground was determined by the Randolph and Wroth'Model in the approached closed form solution,coupling with the hyperbolic model.The action of pile groups was evaluated from the Mindin equation solution,and adjusted by the "reinforcement and curtain"action approximately.The influences of number of piles,the pile length,the space between piles,and the pile-soil relative stiffness factor on the characteristic of pile groups ware analyzed in a systematic way.