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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), the numerical simulation of the wind field under different working conditions of a continuous rigid frame bridge with different working conditions was carried out. The influences of the parameters of beam height, (Coefficient of drag, coefficient of lift, coefficient of torque). The pressure and velocity distribution under different cross sections and angles of attack were analyzed according to the characteristics of aerodynamic flow field. The results show that the beam cross-section height, the wind-attack angle and the cross-section cross-slope all have great influence on the static third-part force coefficient, but the three points have different emphases on the third-part force coefficient: the effect of beam height on the drag coefficient Maximum, with a variation range of 0.494. The angle of attack has the strongest effect on the lift coefficient, with a variation range of 0.382. The effect of cross-slope on the drag coefficient is mainly reflected by the variation range of 0.17. The coefficient of static third component is more sensitive to the shape and size change of the cross section of the beam body. When the beam is on the right and left sides, the drag coefficient varies from 0.04 to 0.21, the lift coefficient varies from 0.009 to 0.2 and the torque coefficient varies from 0 to 0.07. The more obvious the bluff body features, the more complicated the flow field distribution around.