In order to analyze the mechanism of effects of the guide vane on the wind induced vibration response of large span bridge decks, using particle image velocimetry (PIV) system, two groups of experiments on Great Belt Bridge decks, including cases with and without guide vanes were carried out in TJ-4 wind tunnel lab. At the same time, the displacement responses of the deck were also obtained by laser displacement detector. The results show that there exist vortices with the low wind speed under the bridge deck. After the guide vanes are installed, no vortices can be found at the same place. In the cases of high wind speed, no obvious changes influenced by guide vanes are found under the bridge deck. However, the guide vane makes the vortices in downstream of the deck change a lot. The feature of mechanism for critical status is changing from the dominant lift action rooted in vortices with the vorticity being positive to the driving action rooted in both vortices with the vorticity being positive and negative.
Key words
bridge engineering /
wind induced vibration of large span bridge /
wind tunnel experiment /
guide vane /
particle image velocimetry /
flow field mechanism
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