整体温差作用下高桩码头基桩内力计算方法

为研究高桩码头完建后整体温差对基桩内力的影响,结合工程实例,建立三维有限元模型,对上部平台温变规律进行分析,认为斜桩、直桩对上部平台温变约束作用均可忽略不计,平台处于自由温变状态,存在水平位移为零的温变发散中心。基于刚性平台自由温变规律,提出了考虑斜桩码头平动扭转的三维算法,三维算法的桩顶位移、内力与有限元结果接近。对于全直桩或近似对称的斜桩码头,还可简化为平动的二维算法。并给出了直桩、斜桩内力的估算简式,由估算式可知,位于发散同心圆上的直桩内力大于斜桩内力,桩顶轴力、弯矩与桩径2次、4次方成正比,桩径对温差内力的影响显著。

Calculation method of internal force for pile in high piled wharf under whole temperature difference

In order to study the effect of whole temperature difference on pile internal force after the completion of high-piled wharf,a three-dimensional finite element model is established to analyze the temperature deformation law combined with engineering examples.It is considered that the temperature deformation constraints of the oblique pile and vertical pile on the upper platform can be neglected.The platform is in a free temperature deformation state with temperature divergence center whose horizontal displacement is zero.Based on the free temperature deformation law for rigid platform,a three-dimensional algorithm has been proposed on the basis of the translational torsion for inclined pile terminals.The calculated displacement of the top of the pile is close to that of the FEM.For all straight pile or nearly symmetrical inclined pile terminal,it can also be simplified as a two-dimensional translation algorithm.The simplified formulas of the internal forces for the vertical pile and the inclined pile are given.The axial force and bending moment of the pile are proportional to its quadratic and quadruplicate pile diameter and the influence of pile diameter on internal force caused by temperature difference is significant.