Abstract
The unsteady behaviour of a thin plate section or aerofoil strip in a turbulent wind field is described by a two-wavenumber extension of the well known single wavenumber Sears function. The second (spanwise) wavenumber is introduced to deal with the three dimensional effects of the turbulence. The present work considers the unsteady forces induced on finite span sections and investigates the influence of the ratio of span to chord (aspect-ratio) of the section on these three dimensional effects. The analysis shows that the influence of the spanwise wavenumber becomes negligible for the aerodynamic admittance of buffeting lift forces for large enough aspect-ratios, such as those typical of modern long-span bridges, thus supporting the use of strip-theory in these cases.
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