整体温差作用下高桩码头基桩内力计算方法

发布时间：2018-09-17 15:27

【摘要】：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。
[Abstract]:In order to study the influence of the whole temperature difference on the internal force of the foundation pile after the construction of the high pile wharf, a three-dimensional finite element model is established, and the temperature variation law of the upper platform is analyzed, and the inclined pile is considered. The effect of the vertical pile on the temperature variation of the upper platform can be ignored. The platform is in the state of free temperature variation and there exists a temperature divergence center with zero horizontal displacement. Based on the rule of free temperature variation of rigid platform, a three-dimensional algorithm considering the lateral torsion of inclined pile wharf is proposed. The displacement and internal force of pile top are close to the result of finite element method. For a fully straight pile or an approximately symmetrical inclined pile wharf, it can be simplified as a two-dimensional translational algorithm. A simple formula for estimating the internal force of vertical pile and inclined pile is given. It can be seen from the estimation formula that the internal force of vertical pile located on divergent concentric circle is greater than that of inclined pile, and the axial force of pile top, bending moment and diameter of pile are directly proportional to the fourth power of pile diameter, and the influence of pile diameter on the internal force of temperature difference is obvious.
【作者单位】：河海大学港口海岸与近海工程学院;常州市孟河镇农村工作局;
【分类号】：U656.113

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