分离双箱高低雷诺数涡振的试验研究

为了给现代大跨度桥梁抗风设计提供准确的依据,有对其涡振性能和减振措施的有效性进行分析.在同济大学TJ-1和TJ-3进行的分离双箱高低雷诺数涡振试验,通过四十多个工况试验的详细比较,发现在低雷诺数条件下,涡振存在于较大的阻尼比区间范围内,振幅较大且相应的锁定风速区间较宽;而在高雷诺条件下,涡振仅在阻尼比较小时存在,且其振幅也较小.而导流板的减振效果在高低雷诺数试验中表现出差别,且与攻角有关.

Experiments on vortex induced vibration of twin-box bridge sections in high and low Reynolds numbers

In order to better the wind-resistance design of modern large span bridges,it is necessary to inspect the differences of the vortex induce vibrations(VIV) of twin-box bridge sections which is often used now and the discrepancies of its useful mitigation methods in different Reynolds numbers.Experiments with 40 cases were carried out in TJ-1 and TJ-3 wind tunnel with the scale of 1:40 and 1:20.Comparison results show that the amplitudes of VIV which can occur in a rather larger range of damping ratios in low Reynolds number experiments are rather larger and the lock-in range is rather wider.The results also show that the efficiency of the guide vane differs a lot in different Reynolds numbers and different attack angles.