A Robust Macroelement Model for Soil–Pile Interaction under Cyclic Loads
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 10
Abstract
The principal focus of this study is the development of a robust macroelement model for soil–pile interaction under cyclic loads. The model incorporates frictional forces and formation of gaps at the soil–pile interface as well as hysteretic behavior of the soil. The plastic envelope of the soil behavior is modeled via the so-called – approach, outlined in American Petroleum Institute’s guidelines for design of foundation piles for offshore platforms. The macroelement is an intuitive assembly of various basic elements, each of which incorporating a particular aspect of the soil–pile interaction. The modular structure of this macroelement allows straightforward adaptation of improved constitutive models for its building blocks. Herein, we focus on large-diameter, cast-in-drilled-hole reinforced concrete piles (piers) that are partially or fully embedded in soil. These types of piles are frequently used as support structures in highway construction. Consequently, the numerical robustness of the interaction model is assessed with parametric studies on pile systems and soil types relevant to this type of construction. Both elastic and inelastic pile behaviors are considered in the parametric studies. The results indicate that the proposed interaction element is numerically robust, and thus, amenable to routine structural analysis.
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Acknowledgments
This study was funded by Caltrans under Contract No. UNSPECIFIED59A0247. The support and comments of Caltrans engineers C. Whitten and A. Shamsabadi are greatly appreciated. The contents of this paper do not necessarily represent a policy of Caltrans. The writers also would like to thank Dr. K. Orakcal for providing the source code for constitutive models of steel and concrete used in the fiber element implementation.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 10 • October 2006
Pages: 1304 - 1314
Copyright
© 2006 ASCE.
History
Received: Oct 20, 2004
Accepted: Oct 19, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
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