| 近海复杂环境下的H-M-T受荷桩内力位移分析 |
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| 引用本文： | 邹新军,徐洞斌,王亚雄.近海复杂环境下的H-M-T受荷桩内力位移分析[J].地震学刊,2014(6):736-741. |
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| 作者姓名： | 邹新军 徐洞斌 王亚雄 |
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| 作者单位： | 湖南大学岩土工程研究所,长沙410082 |
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| 基金项目： | 国家自然科学基金项目（51378197）资助 |
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| 摘 要： | 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。
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| 关 键 词： | 桩基础 H-M-T联合加载 内力位移 有限杆单元法 凝聚方法 |
Analysis of Piles under H-M-T Combined Loading in Offshore Complex Environment |
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| ZOU Xin-jun,XU Dong-bin,WANG Ya-xiong.Analysis of Piles under H-M-T Combined Loading in Offshore Complex Environment[J].Journal of Seismology,2014(6):736-741. |
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| Authors: | ZOU Xin-jun XU Dong-bin WANG Ya-xiong |
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| Institution: | (Institute of Geotechnical Engineering, Hunan University, Changsha 410082, China) |
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| Abstract: | To investigate the behavior of piles in offshore complex and harsh environments（super typhoon wind,vehicle impact or earthquakes）under H-M-Tcombined loading,the traditional finite pole element method was introduced and improved to set up the basic element stiffness matrix.Then,based on the m method and considering the coupling effects of horizontal force,bending moment and torque,the condensation method was used to obtain a simple and unified pile pole element stiffness matrix.Then,the finite pole element method calculation model was set up to analyze the inner forces and deformations of a single pile under the combined action of horizontal loads,bending moments and torque,with the calculation program worked out by MATLAB as well.Finally,engineering cases was chosen to carry out a parameter comparative analysis,results of which show that the improved finite pole element method in this paper can simulate the stratified characteristics of subsoil,various boundary conditions,and coupling effect of H-M-T loads.Furthermore,compared to the single laterally loaded pile,the displacements and internal forces of piles were increasing.Lastly,there was an effective transmission depth under H-M-T loads（when the relative depth z/L exceeds 0.5,the bending moment and the shear force approach zero,and the torque is significantly reduced.）. |
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| Keywords: | pile foundations H-M-Tcombined loading inner forces and deformation finite pole element method condensation method |
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