Conference Paper Multi-scale experimental comparisons of aerodynamic vibrations of a suspension bridge

Dong, Haotian  ,  Ge, Yaojun  ,  Yang, Yongxin  ,  董, 浩天  ,  葛, 耀君  ,  楊, 詠昕

Multi-scale wind tunnel model tests are based on a suspension bridge crossing a sea strait in China. Currently, the scale effect of aerodynamic vibrations like flutter and vortex-induced vibration (VIV) in model test of long span bridges is generally regarded as a combination of Reynolds number effect and manufacturing accuracy. In this paper, the scale effect of flutter and VIV are carefully studied by comparisons of two sectional model tests with different scale ratios and a full-bridge aeroelastic model test. The results of flutter tests shows that, a) the difference of critical flutter wind speed between Test B and Test C is below 5%; b) the vibration mode of Test C is the first-order torsional vibration of middle span girder, which is the same as Test B predicts; c) the difference between frequencies of flutter vibration of Test B and Test C is within 5%. In general, scale effect in flutter tests is not remarkable and sectional model test has enough accuracy in the prediction of flutter. On the other hand, different VIV characteristics are witnessed in three tests. In Test A and test B, first-order torsional VIV are witnessed. Comparing Test A with Test B, Reynold number effect in VIV presents as the advancing and shortening of “lock-in” wind speed domain and decreasing of VIV amplitude with scale ratio and Reynolds number. In test C, however, coupling VIV is observed at higher lock-in wind speed.
Meeting Information: First International Symposium on Flutter and its Application (May 15-17, 2016. Mielparque-tokyo), Minato-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
形態: カラー図版あり

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