A simplified approach to bridge deck flutter

Flutter instability of flexible bridge decks is investigated in the framework of the semi-empirical Scanlan's approach based on flutter derivatives. The equations of the eigenvalue problem of stability are manipulated and simplified thanks to the analysis of a large number of dynamic and aerody...

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Bibliographic Details
Published inJournal of wind engineering and industrial aerodynamics Vol. 96; no. 2; pp. 229 - 256
Main Authors Bartoli, Gianni, Mannini, Claudio
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 01.02.2008
Elsevier Science
Subjects
Aeroelasticity
Applied sciences
Bridge elements
Bridges
Buildings. Public works
Climatology and bioclimatics for buildings
Exact sciences and technology
Flutter
Flutter derivatives
Simplified method
Stresses. Safety
Structural analysis. Stresses
Wind-tunnel tests
Bridges
46.40.Jj
Simplified method
Flutter
Aeroelasticity
Flutter derivatives
Wind-tunnel tests
Case study
Simplification
Bridges; Aeroelasticity; Flutter; Flutter derivatives; Wind-tunnel tests; Simplified method
Mechanical model
Wind tunnel test
Wind velocity
Aerodynamics
Modeling
Comparative study
Bridge deck
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Summary:Flutter instability of flexible bridge decks is investigated in the framework of the semi-empirical Scanlan's approach based on flutter derivatives. The equations of the eigenvalue problem of stability are manipulated and simplified thanks to the analysis of a large number of dynamic and aerodynamic data. Simple expressions for critical reduced wind speed and coupling frequency are obtained. The major interest of this approximate method is the fact that only three or even two flutter derivatives are required to calculate the flutter instability limit. In addition, these aerodynamic functions are known to be quite reliable and the easiest to be identified through wind-tunnel tests. The proposed formulas seem to give accurate results in a wide range of cases, unless the frequency ratio is very close to unity. The method is shown to apply also in case of cross sections prone to torsional flutter. Finally, the paper offers a valuable insight into the flutter behavior of several types of bridges and investigates the role in the instability onset played by various structural parameters, such as frequency ratio and structural damping.
Bibliography:ObjectType-Article-1
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ISSN:0167-6105
1872-8197
DOI:10.1016/j.jweia.2007.06.001