Geometric Nonlinear Analysis of Self-Supporting Structures for Overhead Transmission Lines
Publication: Practice Periodical on Structural Design and Construction
Volume 28, Issue 2
Abstract
This research evaluates the geometric non-linear behavior of structures often used in transmission lines (TLs) and verifies the influence of different wire lengths, average wind speeds, and unevenness between adjacent towers, using the IEC 60826 standard. Different finite element numerical models were developed considering the isolated tower and also the complete system (tower, wires, and insulator chains). The analyses revealed that a simplified model can be employed for cases of adjacent, equal-length spans, but for cases with different lengths, the effect of geometric nonlinearities (GNLs) can become expressive and influence the type of analysis to be performed. Furthermore, it was found that increasing the average wind speed may imply an increase in the longitudinal unbalance. Finally, it was concluded that the unevenness between spans should be considered when calculating the loads to be applied to the structure, even if the simplified model is used. Based on the outcomes and considering wind speeds between 30 and and adjacent tower unevenness between 0 and 10%, this work establishes practical design criteria to be used by designers in the design of suspension structures of TLs located in the State of Minas Gerais, Brazil. The methodology presented in this paper can be extrapolated to other regions of the country, paying attention to the fact that the recommendations proposed here are valid only for self-supporting towers.
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Data Availability Statement
The numerical models of the tower, which are presented in Figs. 2–6, 8, and 9, are proprietary or confidential in nature and may only be provided with restrictions. All other data are available from the corresponding author upon reasonable request.
Acknowledgments
The authors wish to thank the Companhia Energética de Minhas Gerais (CEMIG) and the Agência Nacional de Energia Elétrica (ANEEL) for the technical and financial support during the development of this work, which is linked to R&D D0592: Development of structures for specific overhead distribution lines, optimized for each macro-region of Minas Gerais, according to the IEC 60826 standard.
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Published In
Practice Periodical on Structural Design and Construction
Volume 28 • Issue 2 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 21, 2022
Accepted: Nov 14, 2022
Published online: Jan 9, 2023
Published in print: May 1, 2023
Discussion open until: Jun 9, 2023
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