Practical Flutter Control Method for Long span Bridges

Abstract:

When faced with the threat of flutter instability, a reasonable and effective passive aerodynamic flutter control method is the best protection scheme for a long span bridge from wind induced collapse in its service life. The effects of several passive aerodynamic flutter control methods were investigated for three widely adopted main girders for long span bridges including closed box girder. It can be concluded that central slotting best suits closed box girder, fairings are able to improve the flutter performance of more bluff girder section significantly, and central stabilizer can be applied to all the three girder sections. In addition, adjusting the position of inspection rails can also achieve the flutter control goal, and a rational combination of different methods may have extra advantages. It should be noted that the flutter control effect of a method is largely influenced by its parameters, so the appropriate setting and optimization of detailed parameters for different flutter control measures are also investigated.