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Full-scale investigation of wind-induced vibrations of a mast-arm traffic signal structure

  • Riedman, Michelle (Simpson Gumpertz and Heger Inc.) ;
  • Sinh, Hung Nguyen (Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute) ;
  • Letchford, Christopher (Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute) ;
  • O'Rourke, Michael (Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute)
  • 투고 : 2014.06.14
  • 심사 : 2015.01.21
  • 발행 : 2015.03.25

초록

In previous model- and full-scale studies, high-amplitude vertical vibrations of mast-arm traffic signal structures have been shown to be due to vortex shedding, a phenomenon in which alternatingly shed, low-pressure vortices induce oscillating forces onto the mast-arm causing a cross-wind response. When the frequency of vortices being shed from the mast-arm corresponds to the natural frequency of the structure, a resonant condition is created causing long-lasting, high-amplitude vibrations which may lead to the fatigue failure of these structures. Turbulence in the approach flow is known to affect the cohesiveness of vortex shedding. Results from this full-scale investigation indicate that the surrounding terrain conditions, which affect the turbulence intensity of the wind, greatly influence the likelihood of occurrence of long-lasting, high-amplitude vibrations and also impact whether reduced service life due to fatigue is likely to be of concern.

키워드

과제정보

연구 과제 주관 기관 : NYSDOT

참고문헌

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피인용 문헌

  1. In-situ measurement of railway-traffic induced vibrations nearby the liquid-storage tank vol.12, pp.5, 2015, https://doi.org/10.12989/eas.2017.12.5.583
  2. Comparison of Two-Dimensional and Three- Dimensional Responses for Vortex-Induced Vibrations of a Rectangular Prism vol.10, pp.22, 2015, https://doi.org/10.3390/app10227996
  3. Study of the aerodynamic damping of wing plates on traffic signal structures based on the 2D one-way FSI analysis vol.6, pp.4, 2015, https://doi.org/10.1080/24705314.2021.1902662