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
may be possible to enhance the performance of the raft by the addition of piles. The use
of a limited number of piles, strategically located, may improve both the ultimate load
2 k9 M3 W. x- n5 r* e2 n( wcapacity and the settlement and differential settlement performance of the raft. This
5 t5 d( A) P6 I7 p9 u9 Xpaper outlines the development of a simplified method of analysis which can provide a
+ T3 g, p0 y7 v9 @useful tool for preliminary design of piled raft foundations. It involves two phases:
" A! Q+ `3 \. f5 t' q1. The assessment of the overall foundation behavior;
& x2 q' Z; ~7 x; T4 N  ]2. The assessment of the behavior under individual column loads.
0 U  |  D4 Y0 V& ~) ~1 uIn both cases, use is made of simplified solutions to compute foundation stiffness
! u) L3 ^# A0 aand capacity characteristics. The selection of design geotechnical parameters is an
essential component of both design stages, and some approximations for estimating the
9 q6 T  |. x! O$ Cnecessary parameters are summarized.
Typical applications to a case history of a piled raft and to model centrifuge tests
" t. U; F# ?  M% U" @0 l1 Oare described, and it is found that the behavior predicted by the simplified analysis is
8 Z8 q3 k3 `) H0 b) rbroadly consistent with the measured behavior."
7 y( F0 [$ X9 g, g6 c 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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