Load and Resistance Factor Design for Serviceability Limit State of Laterally Loaded Drilled Shafts for Transmission Line Structures in Sands
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 148, Issue 1
Abstract
Load and resistance factor design (LRFD) for serviceability limit state (SLS) of laterally loaded drilled shafts was explored for transmission line structures in sand, and the SLS resistance factor (RF) was proposed. Statistical characteristics of various load components, including transverse tension load (TTL), wind-on-structure load (WSL), and wind-on-conductor load (WCL), were considered and assessed. A database was established and adopted to calibrate RF for SLS of laterally loaded drilled shafts in sands. The hyperbolic model was introduced to quantify uncertainties in the lateral load–displacement curves for drilled shafts and adopted to determine the allowable load capacity. A Monte Carlo simulation was performed to calibrate RF for SLS. The effects of target reliability index (), allowable displacement (), ice thickness on conductor (), and various load ratios were all considered in the RF calibration. The values of RF for SLS varied from 0.19 to 0.94 for in the range of 1.5–3.5. Equivalent factors of safety () were obtained for the proposed RFs to evaluate and compare the safety margin of SLS to that of current design practice.
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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 research was conducted with the support of the “National R&D Project for Smart Construction Technology (No. 21SMIP-A158708-02)” funded by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport, and managed by the Korea Expressway Corporation. It was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (No. 2020R1A2C2011966).
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 148 • Issue 1 • January 2022
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© 2021 American Society of Civil Engineers.
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Received: Jan 11, 2021
Accepted: Aug 27, 2021
Published online: Oct 19, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 19, 2022
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