近距离双幅并行连续刚构桥箱梁断面静力三分力系数CFD计算

发布时间：2018-05-05 06:33

本文选题：桥梁 + 静力三分力系数　；参考：《公路》2014年06期

【摘要】：采用CFD软件FLUENT计算了三水河大桥这种近距离双幅并行连续刚构桥箱梁不同断面在不同风攻角和有无护栏情况下的静力三分力系数,与风洞试验结果进行了对比,分析了三分力系数随不同影响因素的变化规律。结果表明:CFD计算结果总体上与物理风洞试验结果吻合较好,对上游桥阻力系数精度较高,对下游桥阻力系数及两幅桥的升力系数和扭矩系数误差稍大;箱梁断面阻力系数随风攻角变化较小,受梁高和有无护栏影响较大,来流风对上游桥的作用为较大的推力,对下游桥的作用为相对较小的吸力;上下游桥的升力系数和扭矩系数绝对值明显低于上游桥的阻力系数,其值也受风攻角、梁高和有无护栏等因素的影响而变化。
[Abstract]:The static three-point force coefficients of the box girder of Sanshuihe Bridge are calculated under different wind attack angles and with or without guardrail by using CFD software FLUENT. The results are compared with the results of wind tunnel test. The variation law of the three-point force coefficient with different influencing factors is analyzed. The results show that the calculation results of the CFD are in good agreement with the physical wind tunnel test results, and the accuracy of the drag coefficient of the upstream bridge is higher, and the error of the lift coefficient and the torque coefficient of the downstream bridge and the two bridges is slightly larger. The cross section resistance coefficient of box girder has little change with the wind attack angle, which is influenced by the beam height and the guardrail, the effect of the incoming wind on the upstream bridge is greater than that on the downstream bridge, and the action on the downstream bridge is relatively small. The absolute value of lift coefficient and torque coefficient of upstream bridge is obviously lower than that of upstream bridge, and its value is influenced by wind attack angle, beam height and guardrail, etc.
【作者单位】：陕西交通技术咨询有限公司;西安科技大学建筑与土木工程学院;浙江大学建筑工程学院;
【基金】：陕西省自然科学基础研究计划项目,项目编号2013JQ7031 陕西省教育厅科研计划项目,项目编号11JK0894
【分类号】：U441.5

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