Electrical Transmission and Substation Structures 2018
Program Considerations for Analysis of Drilled Shaft Foundations
Publication: Electrical Transmission and Substation Structures 2018: Dedicated to Strengthening our Critical Infrastructure
ABSTRACT
The various software suites for concrete drilled shaft foundation designs utilized in the electric transmission line utility industry make different modeling assumptions for analysis. The objective of this study was to conduct a comparative analysis of drilled shafts, subject to transmission line monopole structure loading conditions, designed using the programs LPile by Ensoft, Inc., moment foundation analysis and design (MFAD) by Electric Power Research Institute (EPRI), maintained by DiGioia Gray and Associates, and CAISSON by Power Line Systems, Inc. While the programs' main difference is the modeling of the drilled pier behavior, this study focused on how each program accounted for the interaction of the foundation shafts with the surrounding subsurface. Additionally, the effect of the submerged unit weight of the subsurface due to the presence of groundwater, is also considered as an input variation parameter in this study. Multiple foundation shaft sizes, with varying aspect ratios, were analyzed for a combination of different subsurface material properties and structural loads. The performance of each of the foundation designs was assessed based on the strength and deflection criteria. By comparing the resulting designs, this study provides guidelines to help optimize a drilled shaft design for a given set of parameters.
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REFERENCES
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Information & Authors
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Published In
Electrical Transmission and Substation Structures 2018: Dedicated to Strengthening our Critical Infrastructure
Pages: 146 - 156
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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