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Ground effects on wind-induced responses of a closed box girder

  • Mao, Wenhao (State Key Laboratory for Disaster Reduction in Civil Engineering) ;
  • Zhou, Zhiyong (State Key Laboratory for Disaster Reduction in Civil Engineering)
  • 투고 : 2017.06.21
  • 심사 : 2017.09.28
  • 발행 : 2017.10.25

초록

When bridges are constructed with lower heights from the ground, the formed channel between the deck and the ground will inevitably hinder or accelerate the air flow. This in turn will have an impact on the aerodynamic forces on the deck, which may result in unexpected wind-induced responses of bridges. This phenomenon can be referred to "ground effects." So far, no systematic studies into ground effects on the wind-induced responses of closed box girders have been performed. In this paper, wind tunnel tests have been adopted to study the ground effects on the aerodynamic force coefficients and the wind-induced responses of a closed box girder. In correlation with the heights from the ground in two ground roughness, the aerodynamic force coefficients, the Strouhal number ($S_t$), the vortex-induced vibration (VIV) lock-in phenomena over a range of wind velocities, the VIV maximum amplitudes, the system torsional damping ratio, the flutter derivatives, the critical flutter wind speeds and their variation laws correlated with the heights from the ground of a closed box girder have been presented through wind tunnel tests. The outcomes show that the ground effects make the vortex-induced phenomena occur in advance and adversely affect the flutter stability.

키워드

참고문헌

  1. Barber, T. (2006), "Aerodynamic ground effects: a case study of the integration of CFD and experiments", Int.J. Vehicle Des., 40(4), 299-316. https://doi.org/10.1504/IJVD.2006.009068
  2. Chen, A. R . and Zhou, Z. Y. (2006), "On the mechanism of vertical stabilizer plates for improving aerodynamic stability of bridges", Wind Struct., 9(1), 59-74. https://doi.org/10.12989/was.2006.9.1.059
  3. Diana, G., Rocchi, D., Argentini, T. and Muggiasca, S. (2010), "Aerodynamic instability of a bridge deck section model: linear and nonlinear approach to force modeling", J. Wind Eng. Ind. Aerod., 98(6-7), 363-374. https://doi.org/10.1016/j.jweia.2010.01.003
  4. Gross, J. and Traub, L.W. (2012), "Experimental and theoretical investigation of ground effects at low reynolds numbers", J. Aircraft, 49(2), 576-586. https://doi.org/10.2514/1.C031595
  5. JTG/T D60-01-2004 (2004), Wind-resistent Design Specification for Highway Bridges, China Communications Press, Beijing, China
  6. Larsen, A. (2000), "Aerodynamics of the Tamoca Narrows Bridge-60 years later", Struct. Eng. Int., Hongkong, 243-248.
  7. Lee, J., Han, C.S. and Bae, C.H. (2010), "Influence of wing configurations on aerodynamic characteristics of wings in ground effects", J. Aircraft, 47(3), 1030-1036. https://doi.org/10.2514/1.46703
  8. Mahon, S and Zhang, X. (2005), "Computational analysis of pressure and wake characteristics of an aerofoil in ground effects" , J. Fluid. Eng., 127(2), 290-298. https://doi.org/10.1115/1.1891152
  9. Marshall, D.W., Newman, S.J. and Williams, C.B. (2010), "Boundary layer effects on a wing in ground effects", Aircraft Eng. Aerosp. Technol., 82(2), 99-107. https://doi.org/10.1108/00022661011053391
  10. Matsumoto, M., Yoshizumi, F., Yabutani, T., Abe, K. and Nakajima, N. (1999), "Flutter stabilization and heaving-branch flutter", J. Wind Eng. Ind. Aerod., 83(3), 289-299. https://doi.org/10.1016/S0167-6105(99)00079-3
  11. Mokry, M. (2001), "Numerical simulation of aircraft trailing vortices interacting with ambient shear or ground", J. Aircraft, 38(4), 636-643. https://doi.org/10.2514/2.2840
  12. Park, K. and Lee, J. (2008), "Influence of endplate on aerodynamic characteristics of low-aspect-ratio wing in ground effects", J. Mech. Sci. Technol., 22(12), 2578-2589. https://doi.org/10.1007/s12206-008-0805-y
  13. Prasad, R. (2014), "Computational modeling of wing in ground effects aerodynamics", Indian Institute of Technology, Gandhinagar.
  14. Sarwar, M.W. and Ishihara, T. (2010), "Numerical study on suppression of vortex-induced vibrations of box girder bridge section by aerodynamic countermeasures", J. Wind Eng. Ind. Aerod., 98(12), 701-711. https://doi.org/10.1016/j.jweia.2010.06.001
  15. Williamson, C.H.K. and Govardhan, R. (2004), "Vortex-induced vibrations", Annu. Rev. Fluid Mech., 36(1), 413-455. https://doi.org/10.1146/annurev.fluid.36.050802.122128
  16. Wu, T. and Kareem, A. (2013), "Vortex-induced vibration of bridge decks: Volterra series-based model", J. Eng. Mech., 139(2), 1831-1843. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000628
  17. Yang, M., Yang, W. and Yang, Z.G. (2015), "Wind tunnel test of groud viscous effects on wing aerodynamics", Acta Aerodynamica Sinica, 33(1), 82-86.
  18. Yang, W. and Yang, Z.G. (2014), "Aerodynamic investigation on design of tiltable end plate flow wingcraft", Aircraft Eng. Aeros., 84(1), 4-12.
  19. Yang, Y.X. and Ge, Y.J. (2009), "Aerodynamic flutter control for typical girder sections of long-span cable-supported bridges" , Wind Struct., 12(3), 205-217. https://doi.org/10.12989/was.2009.12.3.205
  20. Zhou, Z., Yang, T., Ding, Q. and Ge, Y. (2015), "Mechanism on suppression in vortex-induced vibration of bridge deck with long projecting slab with countermeasures", Wind Struct., 20(5), 643-660. https://doi.org/10.12989/was.2015.20.5.643