Reference : Wind Tunnel Experiments On Bridge Stays Cables Protection Tubes In Dry Galloping Cond...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/2268/172937
Wind Tunnel Experiments On Bridge Stays Cables Protection Tubes In Dry Galloping Conditions: Processing Method For Bi-Stable Phenomenon
English
Flamand, Olivier [Centre Scientifique et Technique du Bâtiment > > > >]
Benidir, Adel [Centre Scientifique et Technique du Bâtiment > > > >]
Gaillet, Laurent [Institut français des sciences et technologies des transports, de l' aménagement et des réseaux > > > >]
Dimitriadis, Grigorios mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Sep-2014
Proceedings of the Symposium on the Dynamics and Aerodynamics of Cables - SDAC 2014
No
No
International
Symposium on the Dynamics and Aerodynamics of Cables - SDAC 2014
from 25-09-2014 to 26-09-2014
Copenhagen
Denmark
[en] Bridge stay cables ; Galloping ; Circularity defect
[en] Surface irregularity is one of the parameters that have not been deeply examined on stay cables of cable-stayed bridges. This paper focuses on wind tunnel tests on original High Density Polyethylene cable covers, in a range of Reynolds numbers from the sub-critical regime to the critical one, corresponding to values ranging from Re = 9.6x104 to Re = 3.3x105. The experiment consists in measurement of parietal pressures on cable covers in order to investigate the effect of surface irregularity on the mechanism of dry galloping excitation. Previous studies ([1], [3] and [4]) reported that dry galloping of cables with a circular cross section is linked to the appearance of a negative pressure bubble, on one side of the circular cylinder at the critical Reynolds number range, leading locally to a rapid drop in the drag coefficient and the appearance of a no negligible lift force. But such a steady change in local lift force does not generate an alternate excitation on a whole cable. The question of the spatial correlation of this “one bubble “ regime along a cable in real conditions and the capability of this lift force to be varied with time are still not resolved. The present paper aims at showing one first exploration of the spatial and temporal correlation of the pressure pattern along the HDPE tube with respect to the natural circularity defect. The Proper Orthogonal Decomposition (POD) was used to characterize the bi-stability phenomenon occurring at critical Reynolds number regime.
Researchers ; Professionals
http://hdl.handle.net/2268/172937
http://www.conferencemanager.dk/sdac

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