Simplified Design Procedure for Piled Raft Foundations - H.G. Poulos, Fellow, AS

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Abstract
"In situations where a raft foundation alone does not satisfy the design requirements, it
3 C' V$ V, L" s& e  Lmay be possible to enhance the performance of the raft by the addition of piles. The use
0 X4 E* {/ i9 |0 k' a& `of a limited number of piles, strategically located, may improve both the ultimate load
' k* k; f' @  x) y0 r; c3 ~capacity and the settlement and differential settlement performance of the raft. This
paper outlines the development of a simplified method of analysis which can provide a
useful tool for preliminary design of piled raft foundations. It involves two phases:
$ F: c1 N) e& ]7 Y: |. N3 |1. The assessment of the overall foundation behavior;
2. The assessment of the behavior under individual column loads.
& D6 G6 X6 S( ?In both cases, use is made of simplified solutions to compute foundation stiffness
and capacity characteristics. The selection of design geotechnical parameters is an
* A! C! E; d9 x2 O( X- y1 k) I) fessential component of both design stages, and some approximations for estimating the
! f" i! S; u& U9 L3 n$ E) Fnecessary parameters are summarized.
Typical applications to a case history of a piled raft and to model centrifuge tests
; t" c7 w( ^3 Z. H. Eare described, and it is found that the behavior predicted by the simplified analysis is
broadly consistent with the measured behavior."
* }$ P/ p% h" z0 B Simplified Design Procedure for Piled Raft Foundations - H.G. Poulos, Fellow, ASCE.rar (677.45 KB, Lượt tải về: 57)

16/5/2011 15:48 Tải lên

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