Horizontal Stiffness and Damping of Piles in Inhomogeneous Soil
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 4
Abstract
A practically oriented analytical procedure for determining the dynamic stiffness and damping (impedance coefficients) of a laterally loaded pile in soil exhibiting different types of inhomogeneity with depth, is presented. To this end, an energy method based on the Winkler model of soil reaction in conjunction with pertinent shape functions for the deflected shape of the pile are employed. A new elastodynamic model for the wave field around a pile is also introduced. The method is self-standing and free of empirical formulas or constants. Dimensionless closed-form solutions are derived for (1) the distributed (Winkler) springs and dashpots along the pile; (2) dynamic stiffness and damping coefficients at the pile head; (3) active length, beyond which the pile can be treated as infinitely long; and (4) relative contributions to the overall head stiffness and damping of the soil and the pile media. Swaying, rocking, and cross swaying-rocking impedances are considered for parabolic, exponential, and multilayered inhomogeneous soil. The predictions of the model compare favorably with established solutions, while new results are presented. An illustrative example is provided.
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Acknowledgments
The authors would like to acknowledge the contributions, in chronological order, of Mr. Dimitri Roumbas, Dr. Costis Syngros, Ms. Alkisti Zina, Mr. Stefanos Drosos, and Dr. Panos Papastylianou, all former students of the senior author at the City University of New York and University of Patras, in the development of the proposed method. Partial funding received through a Caratheodory Program (B.388) at University of Patras is gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 4 • April 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Apr 8, 2015
Accepted: Jul 22, 2016
Published online: Oct 28, 2016
Discussion open until: Mar 28, 2017
Published in print: Apr 1, 2017
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