Cyclic Plasticity Model Applied to Pile Foundations in Sand
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 141, Issue 5
Abstract
The lateral response of pile foundations in sand is commonly analyzed using the beam on nonlinear Winkler foundation (BNWF) assumption, with load transfer behavior often characterized by the API sand relationship (where is lateral resistance, and is relative displacement between the soil and pile). This relationship was developed for static loading conditions, with cyclic correction factors intended to represent degradation due to many slow loading cycles. However, the model is often applied for dynamic loading conditions (e.g., earthquake shaking) because suitable alternatives have not been formulated. This paper demonstrates that the API sand functional form is not ideal for dynamic analysis of piles, and presents a new functional form that better captures the nonlinear behavior of piles in sand during earthquake loading. The new functional form is developed using bounding surface plasticity theory and implemented in an open-source finite-element modeling platform that is freely available to users. The proposed model is shown to capture the experimental response of a pile from a centrifuge test program using calibrated model parameters.
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Acknowledgments
The research reported in this paper was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government [Ministry of Science, Information and Communications Technology (ICT) and Future Planning (MSIP) No. 2011-0030040].
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© 2015 American Society of Civil Engineers.
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Received: Dec 10, 2013
Accepted: Nov 7, 2014
Published online: Jan 29, 2015
Published in print: May 1, 2015
Discussion open until: Jun 29, 2015
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