Non-Flutter Design Principle for long Span Bridges

Jens Johansson, Michael Styrk Andersen, Michele Starch Øvre

Publikation: Kapitel i bog/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

Abstrakt

The case of flutter on a sharp edged flat plate section model, with a height-to-width ratio of 1:10, has been investigated at four different torsional-to-vertical frequency ratios equal to 0.71, 0.88, 1.19 and 2.10. At a torsional-to-vertical frequency ratio of approximately 1.1 the flutter wind velocity for a thin airfoil shows an asymptotical behavior. In traditional bridge design the torsional-to-vertical frequency ratio is increased to obtain higher flutter wind velocities. In the present study, we investigate, what we will label the non-flutter design principle, in which the torsional-to-vertical frequency ratio will deliberately be smaller than 1. Two cases with frequency ratios of 1.19 and 2.10 showed classical and torsional flutter, respectively. Within the maximum wind velocity obtainable in the wind tunnel the two cases with a frequency ratio below 1 did not show any sign of aerodynamic instability. The results are a first indication the non-flutter design principle could be applicable in future design of slender structures.
OriginalsprogEngelsk
TitelProceedings of the Eighth Asia-Pacific Conference on Wind Engineering
Publikationsdato2013
Sider400-408
DOI
StatusUdgivet - 2013
BegivenhedThe Eighth Asia-Pacific Conference on Wind Engineering - Chennai, Indien
Varighed: 10. dec. 201314. dec. 2013

Konference

KonferenceThe Eighth Asia-Pacific Conference on Wind Engineering
LandIndien
ByChennai
Periode10/12/201314/12/2013

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