For the expressway connecting Ya’an and Kangding, Xingkangte Bridge over Dadu River at Luding crosses the deep Grand Canyon in dry-hot valley area. Vertical stabilizing plates are installed on the center of the bridge deck to improve the structural flutter stability under complex wind environment. For steel truss stiffened girders, layout form of lower stabilizing plates has a certain variability. Here, in order to further optimize vibration suppression effect of lower stabilizing plates, effects of different forms of lower stabilizing plate on flutter performance of the bridge was studied. Firstly, effects of a single stabilizing plate at different locations and separating type stabilizing plates with different forms on critical flutter wind speed were tested in wind tunnel tests. Then simplified 2-D CFD models were established and the corresponding aerodynamic mechanism was explained with aerodynamic input energy values and varying laws of flow field. Study results showed that after installing stabilizing plates, critical flutter wind speeds at different attack angles increase, especially, in cases of negative attack angles; when the absolute value of negative attack angle is larger, the instability of torsional motion becomes the main cause of flutter, stabilizing plates improve torsional stability through blocking vortex movement, changing vortex size and increasing strength of negative pressure area under the windward side of the bridge deck, so it is better to set the central stabilizing plate as a separating type vertical stabilizing plate.
Key words
stabilizing plate /
wind tunnel test /
numerical simulation /
flutter performance /
mechanism analysis
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