Data Reduction and Dynamic Curves of Helical Piles from Large-Scale Shake Table Tests
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 10
Abstract
A helical pile is composed of a steel shaft and single or multiple helical plates welded to its shaft. This study investigated full-scale seismic soil reactions for helical piles embedded in dry sand. Ten helical and driven piles were installed in sand enclosed in a laminar shear box mounted on a large outdoor shake table. The paper discusses interpretation of the seismic loading data and the derived dynamic curves. It examined different curve-fitting formulations utilized for interpretation of pile deformation and soil reactions from measured strains during the tests. An optimum curve-fitting function was selected considering the current test setup and was used to establish soil resistance along the pile shaft and the corresponding curves under simulated earthquake records. The influences of loading frequency, loading intensity, installation method, number of helices, shaft shape, and coupling type on the dynamic curves were evaluated. It was found that the loading frequency and intensity had no effect on the dynamic curves, whereas the installation method, number of helices, and pile shaft shape had minor effects on the obtained dynamic curves.
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Acknowledgments
The authors express their gratitude for all financial support provided by the Helical Pile and Tiebacks Committee (HPTC) members through the Deep Foundation Institute’s (DFI) Special Projects Fund, as well as the National Science Foundation (NSF) (Grant No. 1624153). Furthermore, the authors appreciate all the help donating, transporting, and installing the piles and concrete masses provided by Torcsill Foundations LLC, Ram Jack Foundation, Magnum Piering, Hubbell-Chance, and AMSquared Construction. Finally yet importantly, the authors thank all staff at the NEES/UCSD shaking table facility.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Dec 28, 2017
Accepted: May 16, 2019
Published online: Jul 29, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 29, 2019
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