Buckling of Piles with General Power Distribution of Lateral Subgrade Reaction
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 123, Issue 2
Abstract
A model for evaluating the critical buckling capacity of long slender friction piles is developed with lateral soil support included based on the concept of the subgrade reaction. A general power distribution of the coefficient of the subgrade reaction (kh), with depth, is utilized in the model. The lateral force-deflection (P-y) behavior is assumed to be linear. A parametric study was conducted to demonstrate the effect of ω value, defining the distribution of the horizontal subgrade reaction, on the evaluated buckling capacity. In the case of the free top and fully embedded condition with embedment length (h) greater than 10 m, a 59% increase in the buckling capacity (Pcr) was predicted as ω was increased from 0 (constant horizontal subgrade reaction distribution) to 1 (linearly increasing horizontal subgrade reaction). Results also indicated that the boundary conditions at the pile tip have a minimal effect on Pcr when the nondimensional embedded length (h′) exceeded 3.3 for the free top, 5.6 for the fixed-sway top, and 7.6 for the pinned-top condition. A comparison between a pile load test result reported in the literature and the model presented in this paper favorably verified the applicability of the developed model.
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Information & Authors
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 123 • Issue 2 • February 1997
Pages: 123 - 130
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Feb 1, 1997
Published in print: Feb 1997
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