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本文介绍桥梁承台钻孔桩基础的一种实用计算方法,其要点是:将地面以上外露的桩群、承台设定为竖向整体悬臂梁,地面以下为弹性基础,外荷载作用在承台底面。整个计算过程是将三种外荷载:水平力、弯矩、竖向力按单项分别作用下计算出桩基的受力效应,最后将各单项结果进行总体叠加,得到上述桩基础的内力、变形的统一计算公式。桩的弹性基础采用m法,计算中取用弹性桩,桩的变形系数αh≥2.5,针对工程中常能满足的出≥4.0的条件,将求内力、变形公式中的系数按αh≥4.0制成图表供以查用,节省了计算工作量。本方法概念明确、表达简单、使用方便,适合初步设计、施工图设计审查时使用。
This paper introduces a practical calculation method of bridge platform bored pile foundation. The main points are as follows: the pile groups and caps which are exposed above the ground are set as vertical integral cantilever beams, the foundation below is the elastic foundation, the external load acts on the bearing Taiwan bottom. The whole calculation process is to calculate the stress effect of pile foundation under three kinds of external loads, such as horizontal force, bending moment and vertical force, and finally add the individual results together to obtain the internal force and deformation of the pile foundation Unified calculation formula. The elastic foundation of the pile adopts the m method, and the deformation coefficient αh≥2.5 of the pile is taken into account in the calculation. For the condition of ≥4.0 that can often be satisfied in the project, the internal force and the coefficient in the deformation formula are made by αh≥4.0 Chart for investigation, save the computational workload. The method has the advantages of clear concept, simple expression, convenient use, suitability for preliminary design and construction drawing design review.