计入剪切变形的基桩屈曲稳定分析
Buckling stability analysis of pile considering lateral shear deformation

根据目标不同，建立2个基桩屈曲稳定分析方程. 给出计入水平力剪切变形和P-Δ效应的柱单元刚度矩阵，并以此运用有限元一般原理，给出计入剪切变形影响的基桩稳定性分析方法步骤. 以计入剪切变形和P-Δ效应的柱单元模拟基桩工作，并考虑桩侧土特性、桩顶桩端边界条件等因素影响，通过自编Matlab有限元程序进行基桩稳定案例分析. 分析结果表明，基桩自身剪切变形对基桩屈曲影响较小，埋深较大时桩端边界条件对基桩屈曲稳定性影响极小，均可忽略，而桩顶边界条件和地基系数则对基桩稳定性影响显著.
Two buckling stability analysis equations are established in two specific cases. One rigid equations of beam elements considering the P-Δ effect and the lateral shear deformation produced by lateral load to simulate the working of pile. Procedures for critical buckling analysis of pile by finite pole element method. Case analysis of critical buckling analysis of pile is done. Both shear deformation and boundary condition of the pile tip，has extremely small effect on buckling stability of pile. While boundary condition of the pile block and coefficient of soil reaction，has remarkable effect on buckling stability of pile