Abstract
This paper examines the viability of modifying bridge cable shape and surface for the
purpose of controlling wind-induced vibrations. To this end, an extensive wind-tunnel
test campaign was carried out on various cable shapes about the critical Reynolds
number region. Cable shapes were chosen to passively modify the flow in a particular
manner. Tested shapes included those which have some form of waviness, faceting and
shrouding. Section models were tested using a static inclined rig, allowing them to be
installed at yawed cable–wind angles for both smooth and turbulent flow conditions.
The aerodynamic damping of the tested cylinders is evaluated by applying both 1- and
2-dof quasi-steady aerodynamic instability models. This allows for the prediction of
regions of aerodynamic instability, as a function of flow angle and Reynolds number.
Whilst the plain, wavy and faceted cylinders are predicted to suffer from either dry
inclined galloping, ‘‘drag crisis’’ or Den Hartog galloping, the shrouded cylinder is found
to be stable for all angles of attack, albeit with an increase in drag at typical design wind
velocities. Finally, turbulent flow is found to introduce an increased amount of
aerodynamic damping mainly by providing a more constant lift force over tested
Reynolds numbers.
Original language | English |
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Journal | Journal of Fluids and Structures |
Volume | 27 |
Pages (from-to) | 1006-1020 |
ISSN | 0889-9746 |
DOIs | |
Publication status | Published - 2011 |
Keywords
- Bridge cable vibration
- Shape modification
- Yawed flow
- Passive aerodynamic damping
- Aerodynamic stability