Shape modification of bridge cables for aerodynamic vibration control

Kenneth Kleissl, Christos Georgakis

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Abstract

In this paper, the viability of modifying cable shape and surface for the purpose of controlling wind-induced vibrations is examined. To this end, an extensive wind-tunnel test campaign was carried out on various cable sections in the critical Reynolds number region under both smooth and turbulent flow conditions. Shape modifications of a plain cylinder included waviness, faceting and shrouding. The aerodynamic damping of each section is evaluated by applying 1- and 2-DOF quasi-steady aerodynamic models, which allow for the prediction of regions of aerodynamic instability. Whilst the plain, wavy and faceted cylinders are found to suffer from either dry inclined galloping, ”drag crisis” or Den Hartog galloping, the shrouded cylinder is found to be completely stable for all wind angles of attack, albeit with a slight increase in drag at traditional design wind velocities. The wavy cylinder is found to eliminate the risk of dry inclined galloping, with a reduction in lift fluctuations. Nevertheless, the particular cylinder is at risk of “drag crisis” instability. Finally, turbulent flow is shown to introduce a significant amount of aerodynamic damping by proving a more stable lift force over tested wind velocities.
Original languageEnglish
Title of host publicationProceedings of SEMC, Cape Town, Sep. 2010
Publication date2010
Publication statusPublished - 2010
Event4th. International Conference on Structural Engineering, Mechanics and Computation : Advances and Trends in Structural Engineering, Mechanics and Computaiton - Cape Town, South Africa, South Africa
Duration: 6 Sep 20108 Sep 2010
Conference number: 4
http://www.semc2010.uct.ac.za/

Conference

Conference4th. International Conference on Structural Engineering, Mechanics and Computation : Advances and Trends in Structural Engineering, Mechanics and Computaiton
Number4
Country/TerritorySouth Africa
CityCape Town, South Africa
Period06/09/201008/09/2010
Internet address

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