基于CFD方法的高墩大跨箱梁桥静风力系数参数影响研究  

The CFD based research of the parameters impact for aerostatic coefficients of tall-piered long-spaned girder bridge

作　　者：安里鹏[1] 李德建[1] 王元礼 袁鹏[1] 

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《应用力学学报》2016年第1期143-149,188,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51078356);湖南省交通科技计划项目(201022)

摘　　要：基于计算流体力学（CFD）对某连续刚构桥主梁不同截面、不同工况下的风场特征进行了数值仿真分析,研究了梁高、风攻角、桥梁横坡等参数对桥梁主梁截面静力三分力系数（阻力系数、升力系数、扭矩系数）的影响,并结合气动流场特征分析了不同截面及攻角下的压强和速度分布。研究结果表明：梁截面高度、风攻角、截面横坡均对桥梁静力三分力系数有较大影响,但三者对三分力系数影响的侧重点不同：梁截面高度对阻力系数影响最大,变化幅度达0.494;攻角对升力系数影响最大,变化幅度达0.382;截面横坡主要体现对阻力系数的影响,变化幅度为0.17。静力三分力系数对梁体截面的形状及尺寸变化较敏感,梁体截面左右侧迎风时,阻力系数相差0.04~0.21,升力系数相差0.009~0.2,扭矩系数相差0~0.07;梁高越大,截面钝体特征越明显,周围的流场分布越复杂。Based on computational fluid dynamics(CFD) method, the wind field of continuous rigid frame bridge under different conditions is numerically simulated. The effects of attack angle, beam height and section across slop to tri-component force coefficients(resistance coefficient, lift coefficient and torque coefficient) were studied by this model, and the distributions of pressure and velocity are also analyzed. The results show the three parameters above have great influence on the tri-component force coefficients, while their focuses are different. Beam height mainly affects resistance coefficient, whose change amplitude is 0.494. Attack angle mainly affects lift coefficient, whose change amplitude is 0.382. Across slop mainly affects torque coefficient, the change amplitude of which is 0.17. The tri-component force coefficients are sensitive to the shape and size of the section. When the section of the beam faces the wind in the left or the right, the difference of resistance coefficient is between 0.04 and 0.21, the difference of lift coefficient is between 0.009 and 0.2, and the difference of torque coefficient is between 0 and 0.07. The lager the beam height the blunter the section and the more complex the distribution of flow field around.

关 键 词：计算流体力学 箱梁 静力三分力系数 参数影响 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]