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Wind and Structures
  Volume 20, Number 6, June 2015 , pages 793-810
DOI: https://doi.org/10.12989/was.2015.20.6.793
 


Investigation of wind-induced dynamic and aeroelastic effects on variable message signs
Debbie Meyer, Arindam Gan Chowdhuryand Peter Irwin

 
Abstract
    Tests were conducted at the Florida International University (FIU) Wall of Wind (WOW) to investigate the susceptibility of Variable Message Signs (VMS) to wind induced vibrations due to vortex shedding and galloping instability. Large scale VMS models were tested in turbulence representative of the high frequency end of the spectrum in a simulated suburban atmospheric boundary layer. Data was measured for the 0 and 45 horizontal wind approach directions and vertical attack angles ranging from -4.5 to +4.5. Analysis of the power spectrum of the fluctuating lift indicated that vertical vortex oscillations could be significant for VMS with a large depth ratio attached to a structure with a low natural frequency. Analysis of the galloping test data indicated that VMS with large depth ratios, greater than about 0.5, and low natural frequency could also be subject to galloping instability.
 
Key Words
    aerodynamic drag; galloping; variable message sign; vortex shedding
 
Address
Debbie Meyer, Arindam Gan Chowdhuryand Peter Irwin: Department of Civil and Environmental Engineering, Florida International University, Miami, FL, USA
 

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