The Effects of Wind-Induced Vibration on Steel and Aluminum Light Poles
Vibration is defined as “a periodic motion of the particles of an elastic body or medium in
alternately opposite directions from the position of equilibrium when that equilibrium has
Among the types of vibration that effect steel and aluminum light poles, wind-induced
vibration is particularly detrimental. Although light poles are designed to respond
dynamically to the phenomenon, under the right conditions, wind vibration can drive even
the most soundly designed structures to fail.
This presentation explores how wind-induced vibration can affect the performance and strength
of steel and aluminum light poles. Stress fractures, reduced performance of the pole that
can include luminaire failure and increased swaying, and knock-downs are all examples of the
damaging effects vibration may have on steel and aluminum light poles. The presentation then goes
on to discuss what Aeolian vibration is, how it can be identified, and ways the effects of this
vibration can be mitigated — both proactively and retroactively.
Health, Safety and Welfare
1)Explain the difference between First- and Second-Mode Vibration
2)Predict and avoid the harmful effects of Aeolian Vibration, such as downed poles and fixtures in outdoor lighting areas
3)Properly inspect site lighting structures for signs of Aeolian vibration
Once Aeolian vibration is identified, determine which solution best fits the situation
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