摘要
根据某深水桥梁小尺度圆柱形群桩基础施工现场的实测数据,建立承台-群桩-岩土层三维有限元模型,选取线性波理论和Morison方程计算由通航船只引发的波浪力,并在有限元软件中进行加载分析,得到了承台的水平位移时程曲线,在与监测数据对比验证了模型建立合理的基础上,分析了水中自由段桩身的桩端轴力与桩端剪力的变化规律、桩身弯矩的分布规律,及桩身变形特征。结果表明:在波浪力作用下,垂直于波浪传播方向的两排桩,其各项内力指标中,仅桩顶剪力相差较大,工程中需要对承台与桩基的连接予以重视;尽管不同排桩存在波浪的相位差,但各基桩的变形基本保持一致,主要表现为侧弯并沿波浪传播方向作周期性摆动。
According to the measured data of a small-scale cylindrical group pile foundation construction site of a deep-water bridge,a three-dimensional finite element model of the cap-group pile-rock layer is established.The linear wave theory and the Morison equation are used to calculate the wave force caused by the navigable vessel.The loading analysis was carried out in the finite element software,and the horizontal displacement time-history curve of the bearing cap was obtained.After comparing with the monitoring data and verifying that the model was established reasonably,the pile end axial force and pile end shear force of the free section of the water were analyzed.Variation law,distribution law of pile bending moment and deformation characteristics of pile body.The results show that under the action of wave force,among the two rows of piles perpendicular to the wave propagation direction,only the shear force at the top of the pile differs greatly among the various internal force indicators.In the project,it is necessary to pay attention to the connection between the cap and the pile foundation.Different rows of piles have a phase difference of waves,but the deformation of each foundation pile is basically the same,mainly manifested as side bending and periodic oscillation along the wave propagation direction.
作者
胡春林
孙帅康
HU Chunlin;SUN Shuaikang(School of Civil Engineering and Architecture, Wuhan University of Technology,Wuhan, Hubei 430070,China)
出处
《公路工程》
2022年第2期1-6,19,共7页
Highway Engineering
基金
国家自然科学基金项目(41972271)。
关键词
有限元
波浪力
群桩
内力
变形
finite element
wave force
group pile
internal force
deformation
