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基于Wieghardt地基模型,考虑剪力对桩受力的影响,采用梁的弯曲微分方程,利用梁单元间的位移、转角、弯矩和剪力协调条件,桩的整体平衡条件,建立了不计桩侧摩阻力时两端铰支完全埋入土桩的微分方程,并给出了基桩屈曲临界荷载。利用本文解答分析了地基基床系数对基桩屈曲荷载的影响。结果表明,考虑桩侧有明显土体约束计算的桩屈曲荷载明显大于没有考虑侧向约束桩的屈曲荷载,说明桩侧约束对桩的稳定性具有重要影响;并且基桩屈曲临界荷载随地基基床系数a,b增大而减小;对于细长桩,纯弯曲状态时的屈曲荷载小于考虑剪切变形时的屈曲荷载,实际计算中应采用纯弯曲变形时的屈曲荷载。
Based on the Wieghardt foundation model, considering the influence of shear force on the pile force, the bending differential equation of the beam is used. By using the displacement, corner, moment and shear coordination conditions of the beam elements and the overall equilibrium conditions of the pile, Frictional resistance at both ends of the hinge branch completely buried in the differential equation of soil, and gives the buckling of the pile critical load. The effect of foundation bed coefficient on the buckling load of foundation pile is analyzed by the solution of this paper. The results show that the pile buckling load calculated considering the obvious soil constraint on the pile side is obviously larger than the buckling load not considering the lateral restraining pile, which indicates that the pile lateral constraint has an important influence on the pile stability. And the critical buckling load of the pile varies with the ground foundation For a slender pile, the buckling load in the purely curved state is smaller than that in the case of considering the shear deformation. In the actual calculation, the buckling load under pure bending deformation should be adopted.