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Wind and Structures Volume 18, Number 2, February 2014 , pages 181-194 DOI: https://doi.org/10.12989/was.2014.18.2.181 |
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Development of wind vortex shedding coefficients for a multisided cylinder structure |
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Byungik Chang, Michael Neill, Roy Issa and Aaron Miller
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| Abstract | ||
| A major problem with high-mast light poles is the effects that wind vortex shedding can have on the pole itself because of the lock-in phenomenon. It is desired that the coefficients in the AASHTO Standard Specifications (5th edition) for Structural Supports for Highway Signs, Luminaries, and Traffic Signals be analyzed and refined. This is for the belief that the span of the shapes of poles for which the coefficients are used is much too broad and a specific coefficient for each different shape is desired. The primary objective of this study is to develop wind vortex shedding coefficient for a multisided shape. To do that, an octagonal shape was used as the main focus since octagonal cross sectioned high-mast light poles are one of the most common shapes in service. For the needed data, many wind parameters, such as the static drag coefficient, the slope of aerodynamic lift coefficient, Strouhal number, the lock-in range of wind velocities producing vibrations, and variation of amplitude of vortex-induced vibration with Scruton number are needed. From wind tunnel experiments, aerodynamic parameterswere obtained for an octagonal shape structure. Even though aerodynamic coefficients are known from past test results, they need to be refined by conducting further wind tunnel tests. | ||
| Key Words | ||
| high mast light pole; fatigue design; vortex shedding; slender support structures; wind tunnel testing; simulation | ||
| Address | ||
| Byungik Chang: University of New Haven, WestHaven, Connecticut06516, USA Michael Neill:Phillips 66 Borger Refinery, Borger, Texas 79007, USA Roy Issa and Aaron Miller: West Texas A&M University, Canyon, Texas 79015, USA | ||