Abstract
A field study was conducted to identify the vortex-induced vibrations (VIVs) of stay cables in a cable-stayed bridge. A full-scale health-monitoring system was established to observe the wind effects of the selected cables. The vibration amplitudes in the twenty selected stay cables were first studied. The results indicate that only cable CAC20 has large amplitudes with a multimode and high-frequency vibration in the investigated period. The correlation between the wind and cable vibration was subsequently investigated. The large vibration amplitudes are primarily located in the mean speed scope of 4 to 6 m/s, simultaneously close to the reduced velocity of five when the wind was almost perpendicular to the bridge axis and had a smaller turbulence intensity. Moreover, the relationship between the maximum vibration amplitude with the mean wind speed was fitted by a function that was validated by the measured data. Finally, an estimation method was presented to predict the participative vibration modes that would happen in the VIVs of the stay cables, according to the known wind and cable parameters. The measured cable vibrations were employed to validate this estimation method. The results indicate the estimated vibration modes are close to the measured vibration modes.
Highlights
Long-span cable-stayed bridges with excellent structural performance and elegant appearance have been frequently built worldwide in recent years
The vortex-induced vibration (VIV) of an inclined cable occurs when it is subjected to a wind field [1,2]
Because all of the long-span bridges are constructed in the atmospheric boundary layer, the sheared oncoming airflow acting on the inclined cables increases with height and can excite multimodal VIVs of cables [3,4]
Summary
Long-span cable-stayed bridges with excellent structural performance and elegant appearance have been frequently built worldwide in recent years. The experimental and field tests were performed on long, flexible marine risers, which had multiple frequencies of response (e.g., [7,8,9,10]). Lucor et al [9] performed an investigation on VIV for linear and exponential shear flows by using long and flexible circular cylinders, which usually have larger aspect ratios than. Huera-Huarte [13] and Huera-Huarte and Bearman [14] performed experimental investigations on the dynamic response of a vertical long flexible cylinder with an aspect ratio of 94, vibrating at low-mode frequencies. While it is difficult to perform wind tunnel tests of VIVs with full-scale cables, the field observations are hitherto limited With these considerations, we performed a field study to investigate the VIVs of long-span cables in a real bridge.
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