Prediction of bridge flutter under a crosswind flow

Tan Van Vu, Ho Yeop Lee, Byung Ho Choi, Hak Eun Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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 (H1*,A 2*) 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.

Original languageEnglish
Pages (from-to)275-298
Number of pages24
JournalWind and Structures, An International Journal
Issue number3
Publication statusPublished - 2013 Sept


  • Bridges
  • Eigenvalue
  • Flutter
  • Flutter derivatives
  • Selberg formula
  • Simplified formulations

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering
  • Modelling and Simulation


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