Streamline box girders are widely applied in the design and construction of long-span bridges all over the world.In order to study the influence of modifications of aerodynamic configuration and accessory components on flutter and vortex-induced vibration(VIV),more than 60 cases were tested through a 1?50 scale section model.The test results indicates that the aerodynamic configuration and accessory components of streamline box girders can signifi-cantly affect the wind-induced vibration of bridge,which is in good agreement with the experience of past researchers.From the tests carried out,it is observed that if the horizontal angle of the inclined web of the streamline box girder is below 16°,the critical flutter wind speed of bridge will increase remarkably,and the VIV will diminish.The test results also show that the 15° inclined web can restrain the formation of vortex near the tail,and consequently improve the performance of aerodynamic stability of long-span bridges.Finally,a new streamline box girder with 15° inclined web was presented and strongly recommended in the aerodynamic configuration design of long-span bridges.
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