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Wind and Structures
  Volume 21, Number 1, July 2015 , pages 41-61

Flutter stability of a long-span suspension bridge during erection
Yan Han, Shuqian Liu, C.S. Cai and Chunguang Li

    The flutter stability of long-span suspension bridges during erection can be more problematic and more susceptible to be influenced by many factors than in the final state. As described in this paper, numerical flutter stability analyses were performed for the construction process of Zhongdu Bridge over Yangtze River using the commercial FE package ANSYS. The effect of the initial wind attack angle, the sequence of deck erection, the stiffness reduction of stiffening girders, the structural damping, and the cross cables are discussed in detail. It was found that the non-symmetrical sequence of deck erection was confirmed to be aerodynamically favourable for the deck erection of long-span suspension bridges and the best erection sequence should be investigated in the design phase. While the initial wind attack angle of -3o is advantageous for the aerodynamic stability, +3o is disadvantageous compared with the initial wind attack angle of 0o during the deck erection. The stiffness reduction of the stiffening girders has a slight effect on the flutter wind speed of the suspension bridge during erection, but structural damping has a great impact on it, especially for the early erection stages.
Key Words
    long-span suspension bridges; flutter stability; deck erection; finite element (FE) model; ANSYS
Yan Han, Shuqian Liu and Chunguang Li: School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha, China, 410004
C.S. Cai:School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha, China, 410004;
Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, Louisiana, USA, LA 70803

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