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Flutter analysis methods for bridges stabilized with eccentric wings
Citation Link: https://doi.org/10.15480/882.3931
Publikationstyp
Journal Article
Date Issued
2021-11-12
Sprache
English
Author(s)
Starossek, Uwe
Institut
TORE-DOI
Volume
219
Article Number
104804
Citation
Journal of Wind Engineering and Industrial Aerodynamics 219: 104804 (2021-12-01)
Publisher DOI
Scopus ID
Publisher
Elsevier Science
Analysis methods for computing the flutter speed of bridges stabilized against flutter by stationary wings are presented. The wings are placed outboard the bridge deck to achieve a large lateral eccentricity, which enables them to produce enough aerodynamic damping to effectively raise the flutter speed. Given the focus on flutter, other wind effects are neglected. The analysis can thus be carried out in the frequency domain. The most sophisticated method is based on a specially developed finite aeroelastic beam element, used for modelling a bridge-deck-plus-wings segment, leading to a multi-degree-of-freedom analysis. Such analysis is recommended if the wings do not extend over the full length of the bridge, a design choice that benefits cost efficiency. Second, a simplified two-degree-of-freedom flutter analysis method is described. Simplification is achieved by establishing the wind forces on the wings assuming quasi-steady, instead of unsteady, flow and taking them into account as additional damping and stiffness. Results of example calculations are compared to those of the multi-degree-of-freedom flutter analysis. Finally, it is shown how torsional flutter of a bridge equipped with such wings can be treated in a single-degree-of-freedom analysis. The method is applied to the first Tacoma Narrows Bridge.
Subjects
2-DOF flutter analysis
Aerodynamic damping device
Aeroelastic instability
Finite aeroelastic beam element
MDOF flutter analysis
Passive vibration control
Quasi-steady flow
Stationary wings
Torsional flutter
DDC Class
600: Technik
Publication version
publishedVersion
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1-s2.0-S0167610521002798-main.pdf
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1.33 MB
Format
Adobe PDF