桩基支承梁与弹性地基梁承载性能对比研究  

Bearing Performance Comparison of Pile Foundation SupportBeam and Elastic Foundation Beam

作　　者：薛鹏 杨雅师 孟星宇 董腾 陈灿明[2] XUE Peng;YANG Yashi;MENG Xingyu;DONG Teng;CHEN Canming(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Nanjing Hydraulic Research Institute,Nanjing,Jiangsu 210029,China;Wanjiang Institute of Technology,Maanshan,Anhui 243000,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]南京水利科学研究院,江苏南京210029 [3]皖江工学院,安徽马鞍山243000

出　　处：《水利与建筑工程学报》2023年第2期60-67,共8页Journal of Water Resources and Architectural Engineering

基　　金：南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金项目(Y421001)。

摘　　要：桩基支承梁的梁体承载能力由桩基及梁体本身的刚度提供,而弹性地基梁由于梁体下方和两侧土体的影响,其承载能力较桩基支承梁有一定的提升。以长江下游某内河重力式码头的后轨道梁为研究对象,建立二维模型选取轨道梁危险工况并建立轨道梁三维数值模型,对比分析弹性地基梁与桩基支承梁的内力及位移,研究表明弹性地基梁相比于桩基支承梁,最大挠度减小26.4%~35.3%,最大正弯矩减小11.3%~12.4%,桩身最大压应力减小1.8%~45.3%,最大竖向位移减小28.1%~39.0%,弹性地基梁相比于桩基支承梁在相同的受力情况下,梁体以及桩身的内力、应力均有所减小,弹性地基梁的承载能力更强,同时发现土体轨道梁协同受载不仅使得轨道梁及桩基的受力减小,还会影响轨道梁及桩基的应力分布状态。The bearing capacity of the pile-supported beam is provided by the pile and the stiffness of the beam itself,while the elastic foundation beam has a certain increase in its bearing capacity compared with the pile-supported beam due to the influence of the soil below and on both sides of the beam.By taking the rear track beam of an inland gravity wharf in the lower reaches of Yangtze River as the research object,a two-dimensional model is established to select the danger performances of the track beam and a three-dimensional numerical model of the track beam is established to compare and analyze the internal force and displacement of the elastic foundation beam and the pile-supported beam.The results show that the maximum deflection is reduced by 26.4%~35.3%,the maximum positive bending moment is reduced by 11.3%~12.4%,the maximum compressive stress in the pile is reduced by 1.8%~45.3%,and the maximum vertical displacement is reduced by 28.1%~39.0%for the elastic foundation beam compared with the pile-supported beam.Compared to pile-supported beams,the internal forces and stresses in the beam and pile are reduced under the same stress conditions,and the elastic foundation beam has a stronger bearing capacity.It is also found that the coordinated loading of soil and track beam not only reduces the stress of track beam and pile,but also affects the stress distribution of track beam and pile.

关 键 词：桩基支承 弹性地基 轨道梁 数值模型 

分 类 号：TU398.9[建筑科学—结构工程]