[en] The present work studies the influence of circularity defects, on the aerodynamic behaviour of stay cables of cable-stayed bridges. It focuses on wind tunnel tests on High-Density Polyethylene cable covers with and without helical fillets, in a range of Reynolds numbers from the sub-critical to the critical regime. The paper considers the impact of circularity defects on the aerodynamic stability of cable sheaths by testing various amplitudes of imposed ovalization. The defects are artificially applied on real sheaths whose original cross-sections are close to circular. The experiment consists in measuring surface pressures to investigate how the amplitude of ovalization influences the flow around the sheaths, especially in the critical Reynolds number regime when transition in the boundary layer occurs. The analysis is based on bifurcation diagrams and Proper Orthogonal Decomposition. The investigation demonstrates that important circularity defects can significantly increase the bi-stable nature of the flow around a sheath at the critical regime. Nevertheless, the introduction of a helical fillet de-correlates the flow around the sheath, causing jumps in lift that have different sign along its length.
Disciplines :
Civil engineering
Author, co-author :
Benidir, Adel; National Centre of Integrated Studies and Research on Building Engineering, (CNERIB), New El Mokrani City, 16201, Souidania, Algiers, Algeria
Flamand, Olivier; CSTB, 11 Rue Henri PICHERIT, 44300, Nantes, France
Dimitriadis, Grigorios ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Language :
English
Title :
The impact of circularity defects on bridge stay cable dry galloping stability
Publication date :
October 2018
Journal title :
Journal of Wind Engineering and Industrial Aerodynamics
Andrianne, T., Abdul Razak, N., Dimitriadis, G., Flow visualization and proper orthogonal decomposition of aeroelastic phenomena. Okamato, Satory, (eds.) Wind Tunnels, 2011, InTech ISBN 978-953-307-295-1.
Benidir, A., Flamand, O., Gaillet, L., Dimitriadis, G., Impact of circularity defect on helical fillets HDPE bridge stay covers: analysis of bi-stability at critical Reynolds number by bifurcation diagrams. The 1st Symposium on the Dynamics and Aerodynamics of Cables (SDAC), 2014, DTU, Copenhagen, Denmark Sept. 25–26.
Benidir, A., Flamand, O., Gaillet, L., Dimitriadis, G., Impact of roughness and circularity defect on bridge cables stability. J. Wind Eng. Ind. Aerod. 137 (2015), 1–13 Feb. 2015.
Cheng, S., Irwin, P.A., Jakobsen, J.B., Lankin, J., Larose, G.L., Savage, M.G., Tanaka, H., Zurell, C., Divergent motion of cable exposed to skewed wind. Proceedings of the 5th International Symposium on Cable Dynamics, 2003, 271–278 (Santa Margherita, Italy).
Davies, D.L., Bouldin, D.W., A cluster separation measure. IEEE transaction on patternanalysis and machine intelligence 1:2 (1979), 224–227.
Dowell, E.H., Hall, K.C., Romanowski, M.C., Eigen mode analysis in unsteady aerodynamics: reduced order models. Appl. Mech. Rev. 50:6 (1998), 371–385.
Flamand, O., Rain wind induced vibration of cables. J. Wind Eng. Ind. Aerod. 57:2–3 (1995), 353–362 July. 1995.
Flamand, O., Boujard, O., A comparison between dry cylinder galloping and rain-wind induced excitation. Proceedings of the 5th European and African, 2009 (Florence, Italy).
Katsuchi, H., Yamada, H., Wind-tunnel study on dry-galloping of indented-surface stay cable. The 11th Americas Conference on Wind Engineering, 2009, 22–26 San Juan, Puerto Rico. June.
Kleissl, K., Georgakis, C.T., Comparison of several innovative bridge cable surface modifications. The Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7) Shanghai, 2012, 2–6 China; September.
Larose, G.L., Zan, S.J., The aerodynamic forces on the stay cables of cable-stayed bridges in the critical Reynolds number range. Proceedings of the Fourth International Symposium on Cable Dynamics, 2001, 77–84 Montreal, Canada).
Ma, W.Y., Liu, Q.K., Du, X.Q., Wei, Y.Y., Effect of the Reynolds number on the aerodynamic forces and galloping instability of a cylinder with semi-elliptical cross sections. J. Wind Eng. Ind. Aerod. 146 (2015), 71–80 Nov. 2015.
MacQueen, J.B., Some methods for classification and analysis of multivariate observations. pp. 281–297 Proceedings of the Fifth Berkeley Symposium on Mathematical Statistics and Probability, vol. 1, 1967, University of California Press, University of California, 281–297 USA, June 21–July18, 1965 and December 27, 1965–January 7, 1966.
Matsumoto, M., Yagi, T., Hatsuda, H., Shima, T., Tanaka, M., Naito, H., Dry galloping characteristics and its mechanism of inclined/yawed cables. J. Wind Eng. Ind. Aerod. 98:6–7 (2010), 317–327.
Matteoni, G., Georgakis, C.T., Effects of bridge cable surface roughness and cross-sectionaldistortion on aerodynamic force coefficients. J. Wind Eng. Ind. Aerod. 104–106 (2012), 176–187.
Mctavish, S., Yamauchi, K., Sato, H., An investigation of large-amplitude cable vibrations at critical and supercritical Reynolds numbers. International Symposium on the Dynamics and Aerodynamics of Cables (ISDAC), 2017, FEUP, Porto, Portugal, 30–31 Oct.
Nikitas, N., Macdonald, J.H.G., Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds numbers. Eur. J. Mech. B Fluid Vol 49 (2015), 243–249.
Nikitas, N., Macdonald, J.H.G., Jakobsen, J.B., Andersen, T.L., Critical Reynolds number and galloping instabilities : experiments on circular cylinders. Exp. Fluid 52:Issue5 (2012), 1295–1306.
Schewe, G., On the Force Fluctuations Acting on a Circular Cylinder in Cross Flow from Subcritical up to Trans-critical Reynolds Numbers. J. Fluid Mech., 1983 Cambridge University Press, August-1983, 133, pp. 265–2C85.
Vo, H.-D., Katsuchi, H., Yamada, H., Nishio, M., A wind tunnel study on control methods for cable dry-galloping. J. Front. Struct. Civ. Eng. 10:1 (2016), 72–80.
Zdravkovich, M.M., Flow Around Circular Cylinder - Volume 1: Fundamentals. 1997, Oxford University Press, 163–198.
