Wind and Structures

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Reynolds number and scale effects on aerodynamic properties of streamlined bridge decks

  • Ma, Tingting (College of Ocean Science and Engineering, Shanghai Maritime University) ;
  • Feng, Chaotian (College of Ocean Science and Engineering, Shanghai Maritime University)
  • Received : 2021.10.19
  • Accepted : 2022.04.06
  • Published : 2022.04.25
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Abstract

Section model test, as the most commonly used method to evaluate the aerostatic and aeroelastic performances of long-span bridges, may be carried out under different conditions of incoming wind speed, geometric scale and wind tunnel facilities, which may lead to potential Reynolds number (Re) effect, model scaling effect and wind tunnel scale effect, respectively. The Re effect and scale effect on aerostatic force coefficients and aeroelastic characteristics of streamlined bridge decks were investigated via 1:100 and 1:60 scale section model tests. The influence of auxiliary facilities was further investigated by comparative tests between a bare deck section and the deck section with auxiliary facilities. The force measurement results over a Re region from about 1×105 to 4×105 indicate that the drag coefficients of both deck sections show obvious Re effect, while the pitching moment coefficients have weak Re dependence. The lift coefficients of the smaller scale models have more significant Re effect. Comparative tests of different scale models under the same Re number indicate that the static force coefficients have obvious scale effect, which is even more prominent than the Re effect. Additionally, the scale effect induced by lower model length to wind tunnel height ratio may produce static force coefficients with smaller absolute values, which may be less conservative for structural design. The results with respect to flutter stability indicate that the aerodynamic-damping-related flutter derivatives 𝘈*2 and 𝐴*1𝐻*3 have opposite scale effect, which makes the overall scale effect on critical flutter wind speed greatly weakened. The most significant scale effect on critical flutter wind speed occurs at +3° wind angle of attack, which makes the small-scale section models give conservative predictions.

Keywords

Acknowledgement

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (grant number 52008240) and the Key Laboratory for Wind-Resistance Technology of Bridges, Ministry of Transport (grant number KLWRTBMC14-04).

References

  1. Bai, H., Ma, T.F., Yang, P.R. and Liu, J.X. (2019), "Impact of ancillary facilities on Reynolds number effect of aerostatic coefficients for approximate streamlined bridge", J. Vib. Eng., 32(2), 340-349. https://doi.org/10.16385/j.cnki.issn.1004-4523.2019.02.018.
  2. Barre, C. and Barnaud, G. (1995), "High Reynolds number simulation techniques and their application to shaped structures model test", J. Wind Eng. Ind. Aerod., 57(2-3), 145-157. https://doi.org/10.1016/0167-6105(94)00111-p.
  3. Cermak, J.E., Davenport, A.G., Durgin, F.H., Irwin, P.A., Isyumov, N., Peterka, J.A., Ramsay, S.R., Reinhold, T.A., Scanlan, R.H., Stathopoulos, T., Steckley, A.C., Tieleman, H. and Vickery, P.J. (1999), Wind Tunnel Studies of Buildings and Structures, ASCE Manuals and Reports on Engineering Practice No.67; American Society of Civil Engineers.
  4. Ding, Q.S. (2001), Refinement of Coupled Flutter and Buffeting Analysis for Long-Span Bridges, Ph.D. Dissertation, Tongji University, Shanghai.
  5. Ding, Q.S., Zhou, Z.Y., Zhu, L.D. and Xiang, H.F. (2010), "Identification of flutter derivatives of bridge decks with free vibration technique", J. Wind Eng. Ind. Aerod., 98(12), 911-918. https://doi.org/10.1016/j.jweia.2010.09.005.
  6. Kargarmoakhar, R., Chowdhury, A.G. and Irwin, P.A. (2015), "Reynolds number effects on twin box girder long span bridge aerodynamics", Wind Struct., 20(2), 327-347 https://doi.org/10.12989/was.2015.20.2.327.
  7. Laima, S., Jiang, C., Li, H., Chen, W.L. and Ou, J.P. (2018), "A numerical investigation of Reynolds number sensitivity of flow characteristics around a twin-box girder", J. Wind Eng. Ind. Aerod., 172, 298-316. https://doi.org/10.1016/j.jweia.2017.11.016.
  8. Laima, S., Wu, B.C., Jiang, C., Chen, W.L. and Li, H. (2019), "Numerical study on Reynolds number effects on the aerodynamic characteristics of a twin-box girder", Wind Struct., 28(5), 285-298. https://doi.org/10.12989/was.2019.28.5.285.
  9. Larose, G.L. and D'Auteuil, A. (2006), "On the Reynolds number sensitivity of the aerodynamics of bluff bodies with sharp edges", J. Wind Eng. Ind. Aerod., 94(5), 365-376. https://doi.org/10.1016/j.jweia.2006.01.011.
  10. Larose, G.L., Larsen, S.V., Larsen, A., Hui, M. and Jensen, A.G. (2003), "Sectional model experiments at high Reynolds number for the deck of a 1018m span cable-stayed bridge", Proceedings of 11th International Conference on Wind Engineering, Lubbock, June.
  11. Lee, S., Kwon, S.D. and Yoon, J. (2014), "Reynolds number sensitivity to aerodynamic forces of twin box bridge girder", J. Wind Eng. Ind. Aerod., 127: 59-68. https://doi.org/10.1016/j.jweia.2014.02.004.
  12. Li, H., Laima, S.J. and Jing, H.Q. (2014), "Reynolds number effects on aerodynamic characteristics and vortex-induced vibration of a twin-box girder", J. Fluid Struct., 50, 358-375. https://doi.org/10.1016/j.jfluidstructs.2014.06.027
  13. Matsuda, K., Cooper, K.R., Tanaka, H., Tokushige, M. and Iwasaki, T. (2001), "An investigation of Reynolds number effects on the steady and unsteady aerodynamic forces on a 1:10 scale bridge deck section model", J. Wind Eng. Ind. Aerod., 89(7-8), 619-632. https://doi.org/10.1016/S0167-6105(01)00062-9.
  14. Matsuda, K., Tokushige, M. and Iwasaki, T. (2007), "Reynolds number effects on the steady and unsteady aerodynamic forces acting on the bridge deck sections of long-span suspension bridge", IHI Eng. Rev., 40(1), 12-26.
  15. Schewe, G. (2001), "Reynolds-number effects in flow around more-or-less bluff bodies", J. Wind Eng. Ind. Aerod., 89(14-15), 1267-1289. https://doi.org/10.1016/S0167-6105(01)00158-1.
  16. Schewe, G. and Larsen, A. (1998), "Reynolds number effects in the flow around a bluff bridge deck cross section", J. Wind Eng. Ind. Aerod., 74(6), 829-838. https://doi.org/10.1016/S0167-6105(98)00075-0.
  17. Shang, D.Y. (2015), Experimental Study on Model Scale Effect of Vortex-Induced Vibrations for 1:6 Rectangular cross-sections, Master Thesis, Hunan University, Changsha, China.
  18. Simiu, E. and Scanlan, R.H. (1996), Wind Effects on Structures: Fundamentals and Applications to Design, John Wiley and Sons, INC., New York, NY, USA.
  19. Xu, F.Y., Li, B.B., Cai, C.S. and Zhang, Z. (2014), "Experimental investigations on aerostatic characteristics of bridge decks under various conditions", J. Bridge Eng., 19(7), 04014024. https://doi.org/10.1061/(asce)be.1943-5592.0000601.
  20. Yang, Y.X., Ge, Y.J. and Xiang, H.F. (2007), "Investigation on flutter mechanism of long-span bridges with 2d-3DOF method", Wind Struct., 10(5), 421-435. https://doi.org/10.12989/was.2007.10.5.421.
  21. Yang, Y.X., Ma, T.T. and Ge, Y.J. (2015), "Evaluation on bridge dynamic properties and VIV performance based on wind tunnel test and field measurement", Wind Struct., 20(6), 719-737. https://doi.org/10.12989/was.2015.20.6.719.