Wind and Structures

Techno-Press (테크노프레스)
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On wind stability requirements for emergency car warning triangles

  • Scarabino, A. (Laboratorio de Capa Limite y Fluidodinamica Ambiental, LaCLyFA, Universidad Nacional de La Plata) ;
  • Delnero, J.S. (Laboratorio de Capa Limite y Fluidodinamica Ambiental, LaCLyFA, Universidad Nacional de La Plata) ;
  • Camocardi, M. (Laboratorio de Capa Limite y Fluidodinamica Ambiental, LaCLyFA, Universidad Nacional de La Plata)
  • Received : 2011.01.27
  • Accepted : 2011.09.27
  • Published : 2012.07.25
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Abstract

This work discusses the wind stability requirements specified by UN Reg. 27 on emergency car warning triangles, which are of mandatory use in many countries. Wind tunnel experiments have been carried out in order to determine aerodynamic coefficients of commercial warning triangles and the friction coefficients between the triangle legs and an asphalt base that fulfils the roughness requirements stated by Reg. 27 for wind stability certification. The wind stability specifications for warning triangles are reviewed, compared with pressure field measurements and discussed. Results of wind tunnel tests and comparison with field measurements reported in the literature show that the requirements could be excessively conservative.

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References

  1. Asi, I.M. (2007), "Evaluating skid resistance of different asphalt concrete mixes", Build. Environ., 42(1), 325-329. https://doi.org/10.1016/j.buildenv.2005.08.020
  2. Fenech, R. (2000), "The influence of mixture composition on the skidding resistance of asphalt wearing courses, Faculty of Architecture and Civil Engineering, University of Malta.
  3. Hoerner, S.F. (1965), Fluid-dynamic drag, Hoerner Fluid Dynamics, Bricktown, New Jersey.
  4. IRAM 10.031/84-"Balizas Triangulares Retrorreflectoras", Available (on demand) at www.iram.org.ar
  5. Lee, B.E. (1990), "Some observations of the effect of aspect ratio on the influence of turbulence on the drag of rectangular cylinders", J. Wind Eng. Ind. Aerod., 33(1-2), 107-111. https://doi.org/10.1016/0167-6105(90)90026-9
  6. Letchford, C.W. (2001), "Wind loads on rectangular signboards and hoardings", J. Wind Eng. Ind. Aerod., 89(2), 135-151. https://doi.org/10.1016/S0167-6105(00)00068-4
  7. Persson, B.N.J., Albohr, O., Tartaglino, U., Volokitin, A.I. and Tosatti, E. (2005), "On the nature of surface roughness with application to contact mechanics, sealing, rubber friction and adhesion", J. Phys. Condens. Mat., 17(1).
  8. Quinn, A.D., Baker, C.J. and Wright, N.G. (2001a), "Wind and vehicle induced forces on flat plates. Part 1: wind induced force", J. Wind Eng. Ind. Aerod., 89(9), 817-829. https://doi.org/10.1016/S0167-6105(01)00070-8
  9. Quinn, A.D., Baker, C.J. and Wright, N.G. (2001b), "Wind and vehicle induced forces on flat plates. Part 2: vehicle induced force", J. Wind Eng. Ind. Aerod., 89(9), 831-847. https://doi.org/10.1016/S0167-6105(01)00071-X
  10. Tieleman, H.W., Reinhold, T.A. and Hajj, M.R. (1997): "Importance of turbulence for the prediction of surface pressures on low-rise structures", J. Wind Eng. Ind. Aerod., 69-71, 519-528. https://doi.org/10.1016/S0167-6105(97)00182-7
  11. Tieleman, H.W., Ge, Z., Hajj, M.R. and Reinhold, T.A. (2003), "Pressures on a surface-mounted rectangular prism under varying incident turbulence", J. Wind Eng. Ind. Aerod., 91(9), 1095-1115. https://doi.org/10.1016/S0167-6105(03)00045-X
  12. UN Regulation No. 27 (1998), UNIFORM PROVISIONS FOR THE APPROVAL OF ADVANCE-WARNING TRIANGLES. http://www.unece.org/trans/main/wp29/wp29regs/r027r1e.pdf
  13. Viola, I. and Fossatti, F. (2008), "Downwind sails aerodynamic analysis", Proceedings of the 6th International Colloquium on Bluff Bodies Aerodynamics & Applications, Milan, Italy, July.
  14. Yaragal, S.C., Ram, H.S.G. and Murthy, K.K. (2002), "Two-dimensional flow field behind perforated plates on a flat surface", J. Wind Eng. Ind. Aerod., 90(2), 75-90. https://doi.org/10.1016/S0167-6105(01)00163-5