耦合荷载作用下桩基础的响应性状分析研究

Numerical Analysis of the Response of Pile Foundation under Coupled Loads

采用PLAXIS有限元分析软件建立数值模型,分析在竖向荷载与水平动力荷载耦合的情况下,桩基础的响应性状分布特征。结果表明,竖向荷载较小时,桩基的水平位移随着竖向荷载的增加呈减小的趋势;当竖向荷载较大时,横向位移响应随着竖向荷载的增大而增加;对于强度较低的桩基,竖向荷载成为影响水平承载力及变形性状的主要因素;循环水平荷载若长期作用于承受较大竖向荷载下的桩基,会使桩身出现反向弯曲变形。

The response of the pile foundation under the vertical and cyclic horizontal loads was simulated with a commercial finite element software PLAXIS.The results indicate that,when the vertical load is less than a critical value,the horizontal displacement at the pile head decreases with the increase of the vertical load.When the vertical load exceeds the critical value,the lateral response at the pile head increases with the vertical load.For piles with a relative low strength,the vertical load is a major factor that influence the lateral deflection of the piles.A reverse deflection curve will be developed if the cyclic lateral loads are acting on a pile with large vertical load.