Structural Monitoring and Maintenance

  • 제1권4호
  • /
  • Pages.393-409
  • /
  • 2014
  • /
  • 2288-6605(pISSN)
  • /
  • 2288-6613(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Effectiveness of strake installation for traffic signal structure fatigue mitigation

  • Wieghaus, Kyle T. (Zachry Department of Civil Engineering, Texas A&M University) ;
  • Hurlebaus, Stefan (Zachry Department of Civil Engineering, Texas A&M University) ;
  • Mander, John B. (Zachry Department of Civil Engineering, Texas A&M University)
  • 투고 : 2014.08.02
  • 심사 : 2014.12.03
  • 발행 : 2014.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Across-wind response is often the cause of significant structural vibrations that in turn cause fatigue damage to welded and other connections. The efficacy of low-cost helical strakes to mitigate such adverse response is presented for a traffic signal structure. Field observations are made on a prototype structure in a natural wind environment without and with helical strakes installed on the cantilevered arm. Through continuous monitoring, the strakes were found to be effective in reducing across-wind response at wind speeds less than 10 m/s. Estimates of fatigue life are made for four different geographical locations and wind environments. Results for the class of traffic signal structure show that helical arm strakes are most effective in locations with benign wind environments where the average annual wind speed is not more than the vortex shedding wind speed, which for this investigation is 5 m/s. It is concluded that while strakes may be effective, it is not the panacea to mitigating connection fatigue at all locations.

키워드

과제정보

연구 과제 주관 기관 : Texas A&M Transportation Institute (TTI)

참고문헌

  1. AASHTO (2001), Standard specifications for structural supports for highway signs, luminaires, and traffic signals. American Association of State Highway and Transportation Officials, Washington, D.C., USA.
  2. AASHTO (2009), Standard specifications for structural supports for highway signs, luminaires, and traffic signals. American Association of State Highway and Transportation Officials, Washington, D.C., USA.
  3. AASHTO (2013), Standard specifications for structural supports for highway signs, luminaires, and traffic signals. American Association of State Highway and Transportation Officials, Washington, D.C., USA.
  4. Ahearn, E.B. and Puckett, J.A. (2010), Reduction of wind-induced vibrations in high-mast light poles, Federal Highway Administration (FHWA). Report FHWA-WY-10/02F.
  5. Albert, M.N., Manuel, L., Frank, K.H. and Wood, S.L. (2007), Field testing of cantilevered traffic signal structures under truck-induced gust loads, Texas Department of Transportation. Report No. 4586-2.
  6. Bartilson, D.T., Wieghaus, K.T. and Hurlebaus, S. (Submitted), "Target-less computer vision for traffic signal structure vibration studies", Mech. Syst. Sig. Pr.
  7. Blevins, R.D. (1977), Flow-induced Vibration, Van Nostrand Reinhold, New York, NY, USA.
  8. 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. Rec., 1770, 188-194. https://doi.org/10.3141/1770-24
  9. Christenson, R.E. and Hoque, S. (2011), "Reducing fatigue in wind-excited support structures of traffic signals with innovative vibration absorber", Transport. Res. Rec., 2251, 16-23. https://doi.org/10.3141/2251-02
  10. Connor, R.J., Collicott, S.H., DeSchepper, A.M., Sherman, R.J. and Ocampo, J.A. (2012), Fatigue loading and design methodology for high-mast lighting towers, Transportation Research Board. National Cooperative Highway Research Program (NCHRP) Report 718.
  11. Cook, R.A., Bloomquist, D., Richard, D.S. and Kalajian, M.A. (2001), "Damping of cantilevered traffic signal structures", J. Struct. Eng. - ASCE, 127(12), 1476-1483. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:12(1476)
  12. Cruzado, H.J., Letchford, C. and Kopp, G.A. (2013), "Wind tunnel studies of cantilever traffic signal structures", Wind Struct., 16(3), 225-240. https://doi.org/10.12989/was.2013.16.3.225
  13. Fisher, J.W., Miki, C. Slutter, R.G., Mertz, D.R. and Frank, W. (1983), "Fatigue strength of steel pipe-base plate connections", Eng. Struct., 5(2), 90-96. https://doi.org/10.1016/0141-0296(83)90022-6
  14. Frank, K. (1980), "Fatigue strength of anchor bolts", J. Struct. Div., 106(6), 1279-1293.
  15. Hamilton, H.R., Riggs, S.G. and Puckett, J.A. (2000), "Increased damping in cantilevered traffic signal structures", J. Struct. Eng. - ASCE, 126(4) 530-537. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:4(530)
  16. Hurlebaus, S. and Mander, J.B. (2014), Traffic signal supporting structures and methods, US Patent US8756874.
  17. Kaczinski, M.R., Dexter, R.J. and Van Dien, J.P. (1998), Fatigue-resistant design of cantilevered signal, sign, and light supports, Transportation Research Board. National Cooperative Highway Research Program (NCHRP) Report 412.
  18. Keating, R.B. and Fisher, J.W. (1986), Evaluation of fatigue tests and design criteria on welded details, Transportation Research Board. National Cooperative Highway Research Program (NCHRP) Report 286.
  19. Koenigs, M.T., Botros, T.A., Freytag, D. and Frank, K.H. (2003), Fatigue strength of signal mast arm connections, Texas Department of Transportation. Report No. 4178-2.
  20. Kumar, R.A., Sohn, C. H. and Gowda, B.H.L. (2008), "Passive control of vortex-induced vibrations: An overview", Recent Pat. Mech. Eng., 1(1), 1-11.
  21. Letchford, C., Cruzado, H., and Zuo, D. (2008), Risk assessment model for wind-induced fatigue failure of cantilever traffic signal structures,Texas Department of Transportation. Report No. 4586-4.
  22. Mander, J.B., Chen, S.S., Shah, K.M. and Madan, A. (1992), Investigation of Light Pole Base Integrity, Technical Report submitted to Erie County Department of Public Works, State University of New York (SUNY) at Buffalo, Buffalo, NY, USA.
  23. McDonald, J.R., Mehta, K.C., Oler, W. and Pulipaka, N. (1995), Wind load effects on signs, luminaires, and traffic signal structures, Texas Department of Transportation. Report No. 1303-F.
  24. McManus, P.S., Hamilton III, H.R. and Puckett, J.A. (2003), "Damping in cantilevered traffic signal structures under forced vibration", J. Struct. Eng.- ASCE, 129(3), 373-382. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:3(373)
  25. Miner, M.A. (1945), "Cumulative damage in fatigue", J. Appl. Mech. - T ASME, 12(3), 159-164.
  26. Price, R.L., Puckett, J.A. and Barker, M.G. (2008), Use of wind power maps to establish fatigue design criteria for traffic signal and high-mast structures, Mountain-Plains Consortium (MPC). Report No. 08-207.
  27. 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
  28. Roy, S., Park, Y.C., Sause, R., Fisher, J.W. and Kaufmann, E.J. (2011), Cost-effective connection details for highway sign, luminaire, and traffic signal structures, Transportation Research Board. National Cooperative Highway Research Program (NCHRP) Web-Only Document 176.
  29. Scruton, C. and Walshe, D.E. (1973), Stabilisation of wind-induced structures, US Patent US3076533.
  30. Shah, K.M. (1993), Wind induced fatigue in steel pole bases, M.S. Thesis, State University of New York at Buffalo, Buffalo, NY, USA.
  31. Warpinski, M.K. (2006), The effect of base connection geometry on the fatigue performance of welded socket connections in multi-sided high-mast lighting towers, M.S. Thesis, Lehigh University, Bethlehem, PA, USA.
  32. Wieghaus, K.T. (2015), Mitigating wind-induced fatigue in steel traffic support structures, Ph.D. Dissertation, Texas A&M University, College Station, TX, USA.
  33. Wieghaus, K.T., Mander, J.B. and Hurlebaus, S. (Submitted), "Fragility analysis of wind-excited traffic signal structures", Eng. Struct.
  34. Yen, B.T., Hodgson, I.C., Zhou, Y.E. and Crudele, B.B. (2013), "Bilinear S-N curves and equivalent stress ranges for fatigue life estimation", J. Bridge Eng., 18(1), 26-30. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000325
  35. Yu, D., Butler, K., Kareen, A., Glimm, J. and Sun, J. (2013), "Simulation of the influence of aspect ratio on the aerodynamics of rectangular prisms", J. Eng. Mech. - ASCE, 139(4), 429-438. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000494
  36. 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(10), 3171-3179. https://doi.org/10.1016/j.engstruct.2010.06.005