检修车轨道导流板对流线型箱梁涡振的影响

为研究流线型箱梁的涡激振动特性及涡振抑振措施,以某大跨度钢箱梁斜拉桥为工程背景,通过1:50节段模型风洞试验研究了主梁断面涡激振动响应;采用计算流体力学(computational fluid dynamic, CFD)分析主梁断面的二维流场. 研究结果表明,检修车轨道处漩涡脱落明显,对主梁断面涡激振动性能影响较大;导流板位置从检修车轨道外侧移动到检修车轨道内侧,主梁断面升力系数均方根值减小了24%;在检修车轨道内侧设置导流板,可以有效抑制主梁涡激振动. 

Effect of Guide Vane beside Maintenance Rail on Vortex-Induced Vibration of Streamlined Box Girder

In order to study the vortex-induced vibration performance of streamlined box girders and seek effective mitigation measures, a long-span cable-stayed bridge with steel-box girder was taken as an example to investigate the vortex-induced vibration of the main girder through section model wind tunnel tests at a scale of 1:50. The two-dimensional flow field around the cross section of the main girder was modeled by computational fluid dynamic numerical simulation. The results show that alternate vortexes formation and shedding are repeated periodically behind the maintenance rails, which means that the rails have a significant impact on the vortex-induced vibration. The root mean square value of lift coefficient has a 24% reduction when the guide vanes move from the outside to the inside of the maintenance rails, implying that the vortex-induced vibration can be effectively mitigated by setting guide vans inside the maintenance rail.