New Structural Model for Multicomponent Pile Cross Sections under Axial Load
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 6
Abstract
Piles composed of more than one material in their cross section have been used for more than 100 years. Originally this was limited to driven steel shell or pipe piles filled with portland-cement concrete. More recent developments include various types of drilled elements such as micropiles that consist of various combinations of steel shells, portland-cement grout, and steel reinforcing bars. The structural analysis or design of piles with multicomponent cross sections under axial load requires that the axial stress be apportioned to the various components. Traditionally this has been done using an approximate one-dimensional model that implies the components interact with each other only axially, not radially, and that there is no radial interaction with the ground around the pile. This note presents a new three-dimensional model that explicitly and rigorously considers not only the Poisson effects caused by axial load and the triaxial stress field that develops within and between components of a pile as a result but also how this stress field is affected by radial stresses in the adjacent ground. This new model is based on the theory of linear elasticity and yields a closed-form solution that can be either evaluated independently or incorporated within a more general analytical model for axial pile capacity. Examples of calculated results obtained using this new model are presented and suggest that Poisson effects are relatively small in magnitude so that the traditional one-dimensional model is adequate for routine use in most cases.
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Acknowledgments
The writer acknowledges and thanks Mr. Regis J. Colasanti, P.E., M.ASCE of URS Energy & Construction Division in Denver, for performing the ANSYS analyses that were used to validate both the basic Poulos and Davis solution as well as the 3D model presented in this note as well as for providing critical discussion and peer review of the writer's theoretical work. Thanks are also given to the anonymous ASCE peer reviewers for their detailed constructive criticisms that were useful for helping to focus the presentation of the material contained in this note.
References
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Kodikara, J. K., and Moore, I. D. (1993). “Axial response of tapered piles in cohesive frictional ground.” J. Geotech. Engrg., 119(4), 675–693.
Poulos, H. G., and Davis, E. H. (1974). Elastic solutions for soil and rock mechanics, Wiley, New York.
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York, D. L., Miller, V. G., and Ismael, N. F. (1974). “Long-term load transfer in end-bearing pipe piles.” Transportation Research Record. 517, Transportation Research Board, Washington, D.C., 48–60.
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© 2010 ASCE.
History
Received: Jun 9, 2009
Accepted: Dec 5, 2009
Published online: May 14, 2010
Published in print: Jun 2010
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