Wind and Structures

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Wind tunnel studies of cantilever traffic signal structures

  • Cruzado, Hector J. (Department of Civil and Environmental Engineering, Polytechnic University of Puerto Rico) ;
  • Letchford, Chris (Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute) ;
  • Kopp, Gregory A. (Boundary Layer Wind Tunnel Laboratory, Faculty of Engineering, University of Western Ontario London)
  • Received : 2011.05.12
  • Accepted : 2012.01.29
  • Published : 2013.03.25
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Abstract

The wind-induced vibrations of the mast arm of cantilever traffic signal structures can lead to the fatigue failure of these structures. Wind tunnel tests were conducted on an aeroelastic model of this type of structure. Results of these experiments indicated that when the signals have backplates, vortex shedding causes large-amplitude vibrations that could lead to fatigue failure. Vibrations caused by galloping were only observed for one particular angle of attack with the signals having backplates. No evidence for galloping, previously thought to be the dominant cause of fatigue failures in these structures, was observed.

Keywords

References

  1. AASHTO (2001), Standard specifications for structural supports for highway signs, luminaires, and traffic signals, 4th ed, Washington, DC, American Association of State Highway and Transportation Officials.
  2. ASCE (1961), Wind Forces on Structures, Trans ASCE, 126 Part II, 1124.
  3. Blevins, R. D. (1977), Flow-induced vibration, New York, Van Nostrand Reinhold Company.
  4. Chen, G., Wu, J., Yu, J., Dharani, L.R. and Barker, M. (2001), "Fatigue assessment of traffic signal mast arms based on field test data under natural wind gusts", Transport. Res. Record, 1770, 188-194. https://doi.org/10.3141/1770-24
  5. Christenson, R.E. and Hoque, S. (2011), "Reducing fatigue in wind-excited traffic signal support structures using an innovative vibration absorber", In TRB 90th Annual Meeting Compendium of Papers DVD. Washington, DC, Transportation Research Board.
  6. Cook, R.A., Bloomquist, D., Richard, D.S. and Kalajian, M.A. (2001), "Damping of cantilevered traffic signal structures", J. Struct. Eng., 127(12), 1476-1483. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:12(1476)
  7. Cruzado, H.J. (2007), Risk assessment model for wind-induced fatigue failure of cantilever traffic signal structures, PhD dissertation, Texas Tech University.
  8. Cruzado, H.J. and Letchford, C. (2013), "Full-scale experiments of cantilever traffic signal structures", Wind Struct. (submitted)
  9. Dexter, R.J. and Ricker, M.J. (2002), Fatigue-resistant design of cantilevered signal, sign, and light supports, National Cooperative Highway Research Program Report 469, Washington, DC, National Cooperative Highway Research Program.
  10. Gray, B., Wang, P., Hamilton, H.R. and Puckett, J.A. (1999), "Traffic signal structure research - Univ. of Wyoming", In Structural Engineering in the 21st Century, Proceedings of the 1999 Structures Congress held in New Orleans, Louisiana, April 18-19, (Ed., R. Avent and M. Alawady), 1107-1110, Reston, VA: American Society of Civil Engineers.
  11. Hamilton III, H.R., Riggs, G.S. and Puckett, J.A. (2000), "Increased damping in cantilevered traffic signal structures", J. Struct. Eng. 126(4), 530-537. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:4(530)
  12. Hartnagel, B.A. and Barker, M.G. (1999), "Strain measurements of traffic signal mast arms" In Structural Engineering in the 21st Century, Proceedings of the 1999 Structures Congress held in New Orleans, Louisiana, April 18-19, 1999, edited by R. Avent and M. Alawady, 1111-1114. Reston, VA: American Society of Civil Engineers.
  13. Hirsch, G.H. and Bachmann, H.(1995), "Dynamic effects from wind. Appendix H of Vibration problems in structures: Practical guidelines", by Hugo Bachman et al. Basel, Switzerland, Birkhauser.
  14. Kaczinski, M.R., Dexter, R.J. and Van Dien, J.P. (1998), "Fatigue-resistant design of cantilevered signal, sign, and light supports", National Cooperative Highway Research Program Report 412, Washington, DC, National Academy Press.
  15. McManus, P.S., Hamilton, H.R. and Puckett, J.A. (2003), "Damping in cantilevered traffic signal structures under forced vibration", J. Struct. Eng., 129( 3), 373-382. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:3(373)
  16. Puckett, J.A., Erikson, R.G. and Peiffer, J.P. (2011), "Fatigue testing of stiffened traffic signal structures", J. Struct. Eng., 136(10), 1205-1214.
  17. Pulipaka, N. (1995), Wind-induced vibrations of cantilevered traffic signal structures, PhD dissertation, Texas Tech University.
  18. Pulipaka, N., Sarkar, P.P. and McDonald, J.R. (1998), "On galloping vibration of traffic signal structures", J. Wind Eng. Ind. Aerod., 77 / 78 , 327-336. https://doi.org/10.1016/S0167-6105(98)00153-6
  19. Zuo, D. and Letchford, C.W. (2010), "Wind-induced vibration of a traffic-signal-support structure with cantilevered tapered circular mast arm", Eng. Struct., 32, 3171-3179. https://doi.org/10.1016/j.engstruct.2010.06.005

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