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Wind and Structures
  Volume 8, Number 1, January 2005, pages 1-12
DOI: http://dx.doi.org/10.12989/was.2005.8.1.001
 


A parametric analysis of the flutter instability for long span suspension bridges
M. Como, S. Del Ferraro and A. Grimaldi

 
Abstract
    A simplified analysis able to point out the most relevant geometrical and aerodynamic parameters that can influence the flutter of long span modern bridges is the aim of the paper. With this goal, by using a continuous model of the suspension bridge and by a quasi stationary approach, a simple formula of the combined vertical/torsional flutter wind speed is given. A good agreement is obtained comparing the predictions from the proposed formula with the flutter speeds of three modern suspension or cable stayed bridges: the Great Belt East Bridge, the Akashi and Normandie bridges. The paper ends with some comments and comparisons with the well known Selberg formula.
 
Key Words
    flutter of bridges, aerodynamic instability, long span bridges.
 
Address
Department of Civil Engineering, University of Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
 

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