00672561

Component

http://onlinepubs.trb.org...trr/1994/1447/1447-011.pdf

https://scholar.google.co...Gabr&publication_year=1994

In practice, evidence suggests that long, slender piles subjected to axial loads can fail under axial stresses below the yield point of the pile material. However, using the minimum potential-energy method, it is possible to quantify a general solution for the critical buckling capacity of long, slender friction piles in clay. The Rayleigh-Ritz method is used to select deflection functions satisfying nine geometric boundary conditions. The equivalent buckling length and the critical axial load of the piles are determined from eigenvalues estimated by the Jacobi Rotation Transformation method. Parameter studies performed to investigate the buckling response of fully and partially embedded piles indicated that the boundary conditions of pile tip have no effect on the critical buckling loads when nondimensional embedment length exceeds a critical value. The critical value depends on the pile-top condition and embedment ratio (defined as embedded length divided by total pile length). Side friction's contribution to buckling stability results in less than a 7% variation in critical buckling length. The model's applicability is illustrated using a design example and load-test data reported in the literature.

This paper appears in Transportation Research Record No. 1447, Design and Construction of Auger Cast Piles, and Other Foundation Issues. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401277

English

p. 93-101

1994

Transportation Research Record

0309060532

Figures (14) ; References (7) ; Tables (1)

Axial loads; Boundary value problems; Bridge foundations; Buckling; Eigenvalues; Friction; Friction piles; Length; Support piles

Boundary conditions; Pile length; Side friction

Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB

Jan 13 1995 12:00AM

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