封闭式扁平钢箱梁颤振稳定性气动优化措施风洞试验研究

以某大跨度悬索桥封闭式扁平钢箱梁为例，利用节段模型风洞试验，研究风嘴、导流板、栏杆、导轨对颤振临界风速的影响。试验结果表明，导流板、风嘴和栏杆透风率对颤振临界风速影响显著，栏杆位置和导轨位置对颤振临界风速影响不大，最终确定了一种气动外形较优方案，为类似钢箱梁抗风设计提供了借鉴经验。

Wind Tunnel Test Study of Aerodynamic Optimization Measures for Flutter Stability of Closed Flat Steel Box Girder

Taking the closed flat steel box girder of a long span suspension bridge as an example,this paper conducts a study of the influences of fairing,guide vane,parapet and switch rail on the critical flutter wind speed of the girder through sectional model wind tunnel test.The results of the test indicate that the fairing,guide vane and ventilation ratio of the parapet have notable influences on the critical flutter wind speed,however,the influences of positions of the parapet and switch rail on the flutter wind speed are not notable.Therefore,a good optimization of aerodynamic profile of the girder is confirmed,which may provide reference for the wind resistant design of similar steel box girders.