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为探讨近海复杂恶劣环境(台风超强风力、车辆冲击力或地震产生的复杂力等)下水平力H、弯矩M及扭矩T共同作用时的基桩桩身内力变形特性,基于传统有限杆单元法思想,获得了H-M-T受荷桩的基本单元刚度矩阵。然后,基于m法考虑桩周地基土的侧向约束作用,并计入H-M-T耦合效应,采用凝聚方法导得了具有简洁统一形式的桩身杆单元刚度矩阵,由此建立水平力、弯矩和扭矩组合作用下的桩身内力位移有限杆单元法计算模型,进而采用MATLAB编制出相应的分析计算程序。最后,结合近海工程算例进行了分析。结果表明:1文中提出的改进有限杆单元法能考虑桩周地基土的分层特性、不同边界条件及H-M-T的耦合效应;2相比单一考虑水平受荷,扭矩的存在加大了桩身的位移和内力;3H-M-T复杂受荷模式下,荷载传递存在有效传递深度,当相对深度z/L超过0.5后,桩身弯矩和剪力趋近于零,而扭矩显著减小。
In order to discuss the internal force deformation characteristics of pile foundation under horizontal force H, moment M and torque T in the complicated and harsh offshore environment (typhoon super wind, vehicle impact force or earthquake complex force, etc.) Based on the idea of element method, the basic element stiffness matrix of HMT pile is obtained. Then, based on the m method, the lateral restraint of the soil around the pile circumference is considered, and the HMT coupling effect is taken into account. By using the cohesion method, the element stiffness matrix of the shaft of the pile body is obtained in a simple and unified form, and the horizontal force, bending moment and torque Under the combined action, the calculation model of the finite element method of pile internal force displacement is developed, then the corresponding analysis and calculation program is compiled by MATLAB. Finally, an example of offshore engineering is analyzed. The results show that: 1 The improved finite element method proposed in this paper can consider the stratification characteristics, the boundary conditions and the coupling effect of HMT on the foundation soil around the pile circumference; 2, compared with single considering the horizontal load, the existence of torque increases the pile body Displacement and internal force. Under the complex loading mode of 3H-MT, there is an effective transmission depth of load transfer. When the relative depth of z / L exceeds 0.5, the bending moment and shear force of pile body approach zero and the torque decreases significantly.