Reference : Impact of Circularity Defect of Helical Fillets HDPE Bridge Stay Covers: Analysis of ...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Civil engineering
Impact of Circularity Defect of Helical Fillets HDPE Bridge Stay Covers: Analysis of Bi-Stability at Critical Reynolds Number by Bifurcation Diagrams
Benidir, Adel [Centre Scientifique et Technique du Bâtiment > > > >]
Flamand, Olivier [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 >]
Proceedings of the Symposium on the Dynamics and Aerodynamics of Cables - SDAC 2014
Symposium on the Dynamics and Aerodynamics of Cables - SDAC 2014
from 25-09-2014 to 26-09-2014
[en] Bridge stay cables ; Galloping ; Circularity defect
[en] Dry galloping of cables is still considered by the scientific community as an important phenomenon lacking investigation on cable stayed bridge. The helical fillet cylinders developed to overcome the Rain-Wind Induced Vibration (RWID) were reported to be affected by the appearance of vibration in dry conditions. This paper focuses on a method developed to process data issued from wind tunnel tests on original High Density Polyethylene (HDPE) cable covers with helical fillets, in a range of Reynolds numbers from the sub-critical regime to the critical regime. Corresponding values range from Re = 9.6x10^4 to Re = 3.6x10^5 for the present work. The experiment consists of investigating the effect of the helical fillets with natural or controlled deformation of his circularity defect. Previous studies ([1], [3] and [4]) reported that dry galloping is caused by the appearance of a negative pressure bubble on one side of a circular cylinder at the critical Reynolds number range, leading to a rapid drop in the drag coefficient and the appearance of a non negligible lift force. Because the flow oscillates between two states, say TrBL0 and TrBL1, giving way to a fluctuating lift force supposed to cause the vibration of cables. However, [1] reports that the TrBL1 regime disappears in the presence of helical fillets. The aim of the current study was to investigate a possible appearance of the TrBL1 regime when the circularity defect threshold exceeds the filet thickness. In this case, the second purpose was to characterize the bi-stability of this phenomenon and provide new tools for wind engineering processing.
Researchers ; Professionals

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