Abstract
In this study, the resistance factors () in the load and resistance factor design (LRFD) for the drilled-shaft foundation of transmission line structures subjected to lateral loads were investigated. Various load test results were collected to establish a database and used in the reliability analysis. The first-order reliability method (FORM) was implemented to calibrate for the Broms, Brinch-Hansen, and Prasad and Chari methods. Loads for transmission line structures were categorized and characterized statistically for calibrating . Uncertainties of the transverse tension load (), wind-on-structure load (), and wind-on-ice-coated conductor load (), all dominant in transmission line structures, were evaluated. varied largely with nominal load ratios of and , which should be considered for the selection of in the design to maintain a consistent safety margin. Increases in nominal and induced higher while increasing nominal yielded lower . The higher values obtained in this study were due to the low bias factors of wind-induced loads and the large load factors of the tension and wind loads. The equivalent factor of safety () was evaluated and analyzed for the proposed s.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Research Institute of Korea Electric Power Corporation (KEPRI). It was also supported by the National Research Foundation of Korea (NRF) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE), with grants funded by the government of Korea (Project Nos. 20194030202460 and 2020R1A2C2011966). This paper is dedicated to the memory of our dear coauthor Professor Dongwook Kim.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 5 • May 2021
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© 2021 American Society of Civil Engineers.
History
Received: Mar 13, 2020
Accepted: Dec 10, 2020
Published online: Feb 27, 2021
Published in print: May 1, 2021
Discussion open until: Jul 27, 2021
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