Analysis of common aerodynamic measures for wind resistant design of long span bridges

To improve the wind resistant performance of long span bridges, the common aerodynamic measures and their mechanism for suppressing the vortex-induced resonance and for improving the flutter stability of the bridges are preliminarily analyzed. Since the vortex-induced resonance and flutter stability of the bridges are correlated with the vortex generation and vortex drift, the general principle of optimizing the aerodynamic measures is to improve the windward and leeward structural aerodynamic profiles in order to delay or avoid the flow separation, reduce the separated vortex scales and impede the vortex drift paths. As regards the aerodynamic measures for suppressing the vortex-induced vibration of the bridges, the rounded corners and wind fairings are generally installed, the shapes of the wind fairings are optimized and the guide vanes are installed while as regards the measures for improving the flutter stability, the wind fairings are generally installed, the shapes of the wind fairings are optimized and the stabilizers and aerodynamic wing plates are installed. Researches indicate that the aerodynamic performance of the long span bridges can be improved after these measures have been taken. ©, 2015, Wuhan Bridge Research Institute. All right reserved.