The Study of Suppressing the Flutter of Suspension Bridges by Active Aerodynamic Wings
Liu Gao(1), Qiang Shizhong(2), Wang Xiuwei(3)
(1 State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, China)
(2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)
(3 Department of Bridge Engineering, Shijiazhuang Railway Institute, Shijiazhuang, 050043, China)

Abstract: Using active aerodynamic wing is a new aerodynamic measure for bridge stability. Based on the unsteady aerodynamic theory, the express ions of the aerodynamic forces acted on per length of the whole bridge deck are derived. The bridge deck consists of the original bridge deck and the active aerodynamic wings attached bellow the leading and the trailing edges of the deck. Then, from the standpoint of increasing the torsional damping of the system, the selection of the parameters of the active torsional vibration of the active aerodynamic wings is discussed. Finally, the flutter analysis of a long-span suspension bridge project is carried out with the 2-DOF mathematical model. The results show that with reasonable selection of the parameters of the active torsional vibration, the active aerodynamic wings can improve the flutter stability of the bridge effectively. 
Keywords: Suspension bridge, flutter, active aerodynamic wing, aerodynamic damping.