Electrical Transmission and Substation Structures 2018
Case Study for Behaviour of Transmission Line Structures under Full-Scale Flow Field of Stockton, Kansas, 2005 Tornado
Publication: Electrical Transmission and Substation Structures 2018: Dedicated to Strengthening our Critical Infrastructure
ABSTRACT
High intensity wind events, in the form of tornadoes and downbursts, cause the majority of transmission line system failures at many locations worldwide. The current case study investigates the structural response of two different transmission line systems under the Stockton, Kansas, 2005 EF2 tornado. Multi-span self-supported and guyed transmission line systems are considered in the study. Nonlinear three-dimensional finite element models are developed for both systems. The finite element models simulate six spans and five towers. Computational fluid dynamics simulation is used to develop the matching EF2 tornado wind fields. Using proper scaling method for geometry and velocity, full-scale flow field of Stockton, KS, 2005 tornado is simulated. The velocity field is incorporated into the three-dimensional finite element models. By varying the location of the tornado relative to the transmission line systems, peak internal forces in tower members are obtained. Sensitivity analysis is conducted to assess the variation of the members’ peak forces associated with the location of the tornado relative to the transmission line systems. The transmission tower members’ peak internal forces due to the 2005 Kansas tornado are compared with corresponding values evaluated using the ASCE-74 guidelines, which currently do not account for the tornado loading.
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Published In
Electrical Transmission and Substation Structures 2018: Dedicated to Strengthening our Critical Infrastructure
Pages: 257 - 268
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
Published in print: Nov 1, 2018
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