基于ANSYS的组合荷载作用下水平受荷桩的有限元分析

Finite element analysis of piles with standing horizontal loads in complex foundation

根据泰州市郊某一拟建工程中桩的水平静载试验数据,运用有限元分析软件ANSYS,对水平荷载单独作用下的单桩进行了三维有限元数值模拟与分析,并在此基础上对模型进行改进,研究了组合荷载作用下桩的工作性状。主要分析了水平荷载、轴向荷载、桩的抗弯刚度、桩径以及自由段桩长对桩身响应的影响。研究结果表明:桩身水平位移和弯矩随着水平荷载和轴向荷载的增加而增大,且当水平荷载较大时,轴向荷载作用引起的P–?效应(轴向荷载引起的附加位移)比较明显,其随自由段桩长的增加而增大,随抗弯刚度和桩径的增加而减小。

According to the level of static load test data of pile, which from the proposed construction project of Taizhou suburb, the pile under horizontal load is analyzed in three-dimensional finite element numerical simulation by ANSYS, and the work character of pile under combined loads by the improved model is studied. The influence of the horizontal load, axial load, bending stiffness of pile, pile diameter and free period of pile length to the response of pile body is analyzed. The results show that： The horizontal displacement and bending moment of pile increase with the increasing of horizontal load and axial load, and the axial load effect of P-A （additional displacement caused by axial load） is obvious when the horizontal load is bigger, and it increases with the increasing of the free period of pile length, also it decreases with the increasing of bending stiffness and pile diameter.