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海上风力发电机的大直径桩通常会受到多向荷载共同作用。在实践设计中,基础的竖向和水平承载性能是独立分开设计的,但大量研究证明竖向荷载对桩基水平承载性能具有重要的影响。将竖向荷载对大直径单桩水平承载性能的影响划分为3部分:(1)竖向荷载对桩周p–y曲线影响;(2)P–(35)效应;(3)桩侧摩阻力引起的反向弯矩。然后,以楔形体模型为基础考虑竖向荷载对桩侧土抗力极限值pu的影响推导了修正p–y曲线计算公式,在传统水平受荷桩的弹性地基梁方程中引入P–(35)效应和桩侧摩阻力引起反向弯矩,建立了均质砂土中承受水平力、竖向力及弯矩三向组合荷载下的单桩的分析方法。并将该方法应用于既有案例,验证了该理论方法的可行性。
Large-diameter piles of offshore wind turbines are often subjected to multi-directional loads. In practical design, the vertical and horizontal bearing performances of the foundation are designed separately, but a large number of studies have proved that the vertical load has an important influence on the horizontal bearing capacity of the pile foundation. The effect of vertical load on the horizontal bearing performance of large diameter single pile is divided into three parts: (1) the influence of vertical load on the p-y curve of the pile; (2) P–(35) effect; (3) pile side friction Reverse bending moment caused by resistance. Then, considering the influence of vertical load on the limit value pu of pile-side soil based on the wedge model, the formula for the modified p–y curve was deduced, and P–(35) was introduced into the beam equation of the elastic foundation on the traditional horizontal loaded pile. The effect and the frictional resistance caused by the pile side caused the reversed bending moment, and the analytical method was established to analyze the single pile subjected to the combined loads of horizontal force, vertical force and bending moment in homogeneous sand. The method was applied to existing cases and the feasibility of the theoretical method was verified.