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采用三维非线性有限元方法对水平荷载作用下海上单桩基础力学响应进行了比较系统的数值分析.桩身混凝土采用弥散开裂模型,钢筋采用基于Mises屈服准则的理想弹塑性本构模型.首先对已有的基桩水平静载原位试验进行了数值模拟,计算结果与相关试验数据比较吻合.进而探讨桩周土内摩擦角、变形模量、桩体配筋率及竖向荷载水平等对海上单桩桩头水平位移与水平承载力的影响,结果表明:增大桩周土内摩擦角可有效提高桩基水平承载力.配筋率较低的单桩,其水平承载力容许值主要受桩身开裂控制,而对于配筋率较高的桩,水平承载力容许值受桩头水平位移控制.由上部结构物传递下来的竖向荷载有利于桩顶侧移的减小,但同时会增加桩身最大弯矩,最优竖向荷载水平为单桩竖向极限荷载的0.4~0.6倍.
The three-dimensional nonlinear finite element method is used to analyze the mechanical response of the single pile under the horizontal load in a comparatively systematic way.The ideal model of the elastic-plastic constitutive model based on Mises yield criterion is adopted for the reinforced concrete.Firstly, The existing in-situ tests of horizontal static load of pile foundation are carried out numerical simulation, and the calculated results are in good agreement with the relevant experimental data. Then the internal friction angle, deformation modulus, reinforcement ratio and vertical load level The results show that increasing the internal friction angle around the pile can effectively increase the horizontal bearing capacity of the pile. The allowable value of the horizontal bearing capacity of the single pile with lower reinforcement ratio is mainly Which is controlled by the cracking of the pile body, while the allowable horizontal bearing capacity is controlled by the pile head horizontal displacement for the pile with higher reinforcement ratio.The vertical load transferred from the superstructure is conducive to the reduction of pile top displacement, Will increase the maximum bending moment of pile, the optimal vertical load level is 0.4 ~ 0.6 times the vertical ultimate load of single pile.