Wind-induced Oscillations of Cantilevered Traffic Signal Structures

Abstract eng:
Wind-induced oscillations of mast arms of cantilever traffic signal structures can lead to fatigue failure. One such structure with a 13.7 m mast arm has been equipped with a sonic anemometer and a camera that records the motions of the tip of the arm. Initials results of 10 hours of collected data showed that vertical (or in-plane) oscillations are much larger than horizontal (or out-of-plane) oscillations; that the higher amplitude horizontal oscillations have a propensity to occur when the wind is more turbulent; that the higher amplitude vertical oscillations have a higher probability of occurring when the wind speed is steady between 4 to 5 m/s; and that vortex shedding seems to be an important mechanism for generating large amplitude motion in cantilever traffic signal structures More data will be collected to validate these findings.

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