考虑细观桩侧摩阻效应的桥梁桩基水平受荷响应分析

Analysis for Laterally Loaded Response of Bridge Pile Foundations Considering Mesoscopic Pile Side Friction

桥梁桩基除了要承受竖向荷载之外,往往也要承担很多水平荷载。对水平受荷桩基的桩侧摩阻效应进行细观分析,提出了考虑桩侧摩阻效应的桩身挠曲线微分方程,再结合p-y曲线法对桩基水平受荷响应进行求解分析,并用计算结果与试验数据对比,证明了方法的可靠性。基于提出的方法,探究了桩土界面摩擦角以及桩基尺寸效应对水平受荷桩土体系的影响。研究结果表明,桩侧摩阻对桩土体系有加强作用,桩侧摩阻效应影响下桩顶位移和桩身最大弯矩的折减比随桩土界面摩擦角的增大而减小,也随桩径的增大而显著减小。所得结论对今后桥梁桩基工程具有重要的参考价值。

In addition to the vertical load,the bridge pile foundations often bear a lot of horizontal loads.In this paper,the pile side friction effect of horizontally loaded pile foundation was analyzed,and the deflection differential equation of pile considering the pile side friction effect was put forward,and then the horizontal load response of pile foundation was solved and analyzed with the p-y curve method.The reliability of the proposed method was proved by comparing the calculation results with the experimental data.Based on the proposed method,this article explored the influence of the pile-soil interface friction angle and pile size effect on the pile-soil system.The results show that the pile side friction of pile-soil system has strengthening effect,and the reduction ratio of the pile-head displacement and the maximum bending moment under the influence of pile side friction effect decreases with the increase of pile soil interface friction angle,also along with the increase of pile diameter decreases significantly.The conclusion has important reference value for bridge pile foundation engineering in the future.