Electrical Transmission and Substation Structures 2018
Challenges in Design and Mitigation of Wind-Induced Vibration for Slender Steel Pole Transmission Structures
Publication: Electrical Transmission and Substation Structures 2018: Dedicated to Strengthening our Critical Infrastructure
ABSTRACT
Slender steel pole transmission structures can be subject to severe wind-induced oscillations due to vortex excitation. Several examples are presented as case studies, including dead-end frames and V-type and monopole transmission towers. Mitigation studies have resulted in reduction of vibration to acceptable levels. Strategies have included vortex spoiling, reduction of lock-in response via increasing the mass-damping parameter (Scruton no.), and addition of tuned mass dampers. Associated design implications are discussed.
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ACKNOWLEDGMENTS
The author gratefully acknowledges the engineering support of the following organizations who assisted on one or more of the case studies summarized herein,
CPP, Inc. Fort Collins, Colorado
Walter P. Moore and Associates, Inc., Austin, Texas
Kinectrics Inc, Toronto, Ontario
National Wind Institute, Texas Tech University, Lubbock, Texas
A. Salvi & C. A.p.A., Milano, Italy
Bowen Test Laboratory, Purdue University
…and the owners, developers, designers, and fabricators in the electrical transmission line industry who brought forward their subject projects and fully cooperated in a responsible manner to remedy them.
REFERENCES
Ahearn, Emily B., and Pucket, J.A (2010). Reduction of Wind-Induced Vibrations in High-Mast Light Poles. FHWA-WY-10/02 Final Report.
Dyrbye, C, and Hansen, S.O. (1997). Wind loads on structures. Wiley, Chichester.
Hansen, Svend Ole (2007). “Vortex-induced vibrations of structures,” Structural Engineers World Congress, Bangalore, India, November.
Phares, Brent M., Sarkar, Partha P., & Wipf, Terry J., and Chang, Byungik (2007), Development of fatigue procedures for slender, tapered support structures for highway signs, luminaries, and traffic signals subjected to wind-induced excitation from vortex-shedding and buffeting. Final Report, Midwest Transportation Consortium, Iowa State University, November.
Zdravkovich, M.M. (1982). Letter to the Editor “Scruton number; a proposal.” Jl Wind Engr Ind Aero, 10(1982) pp. 263
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Published In
Electrical Transmission and Substation Structures 2018: Dedicated to Strengthening our Critical Infrastructure
Pages: 445 - 457
Editor: Michael Miller, SAE Towers
ISBN (Online): 978-0-7844-8183-7
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Nov 1, 2018
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