Role of Torsional Shear in Combined Loading of Drilled Shaft Foundations
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 4
Abstract
Deep foundations may be subjected to combined torsional and lateral loads. However, there are few full-scale observations to inform a complete understanding of the possible foundation response. This paper describes the generation and transfer of lateral loads that developed within drilled shaft foundations subjected to quasi-static and cyclic torsional loads. Due to differences in stratigraphy, one drilled shaft experienced geotechnical torsional failure, whereas the other did not. Torsional loading to failure produced shear cracks that softened the soil–structure interface and produced a softened response to the lateral load that developed. Cyclic loading resulted in increased lateral displacement at near-constant lateral load amplitude. The maximum bending moment observed in the shaft that experienced torsional failure was significantly greater than that in the shaft in which geotechnical failure did not occur, and greater than that anticipated from lateral loading alone.
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Acknowledgments
The Oregon Department of Transportation (ODOT) funded the experimental portions of this research through the Grant SPR 304-701. Partial funding for this work was provided by USDOT’s University Transportation Center program through Grant No. DTRT13-G-UTC40 through the Pacific Northwest Regional University Transportation Center (PacTrans) with matching funds from ODOT. All opinions and findings are those of the authors and do not reflect the opinion of the funding agencies. PLI Systems, Hillsboro, Oregon donated materials, equipment, and labor to construct the test shafts. Helpful assistance with the test setup and execution was provided by Xiaomin (Jacky) Chen, Tygh Gianella, Andrew Strahler, John Martin, Jeff Gent, and James Batti.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 4 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jan 25, 2018
Accepted: Oct 17, 2018
Published online: Feb 15, 2019
Published in print: Apr 1, 2019
Discussion open until: Jul 15, 2019
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