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Wind and Structures
  Volume 17, Number 3, September 2013 , pages 275-298

Prediction of bridge flutter under a crosswind flow
Tan-Van Vu, Ho-Yeop Lee, Byung-Ho Choi and Hak-Eun Lee

    This paper presents a number of approximated analytical formulations for the flutter analysis of long-span bridges using the so-called uncoupled flutter derivatives. The formulae have been developed from the simplified framework of a bimodal coupled flutter problem. As a result, the proposed method represents an extension of Selberg\' s empirical formula to generic bridge sections, which may be prone to one of the aeroelastic instability such as coupled-mode or single-mode (either dominated by torsion or heaving mode) flutter. Two approximated expressions for the flutter derivatives are required so that only the experimental flutter derivatives of (H*2A*1) are measured to calculate the onset flutter. Based on asymptotic expansions of the flutter derivatives, a further simplified formula was derived to predict the critical wind speed of the cross section, which is prone to the coupled-mode flutter at large reduced wind speeds. The numerical results produced by the proposed formulas have been compared with results obtained by complex eigenvalue analysis and available approximated methods show that they seem to give satisfactory results for a wide range of study cases. Thus, these formulas can be used in the assessment of bridge flutter performance at the preliminary design stage.
Key Words
    bridges; eigenvalue; flutter; flutter derivatives; selberg formula; simplified formulations
Tan-Van Vu : Faculty of Civil Engineering, Ho Chi Minh City University of Architecture, Vietnam
Ho-Yeop Lee and Hak-Eun Lee: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, Korea
Byung-Ho Choi : Department of Civil Engineering, Hanbat National University, Seoul, Korea

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