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

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Abstract
& s0 W$ ?* e: K$ E"In situations where a raft foundation alone does not satisfy the design requirements, it
6 x1 y2 q; o6 mmay be possible to enhance the performance of the raft by the addition of piles. The use
, ~* W% r: _6 U  a) x  t  sof a limited number of piles, strategically located, may improve both the ultimate load
capacity and the settlement and differential settlement performance of the raft. This
* Q: i4 p+ c, Y# E' R5 k" |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:
# a$ @2 H4 p6 @- Y' u  p1. The assessment of the overall foundation behavior;
9 [# m$ B1 D9 L% a" i2. The assessment of the behavior under individual column loads.
3 d. D5 r2 |2 Z& p4 BIn both cases, use is made of simplified solutions to compute foundation stiffness
5 a1 n  T1 }  }2 N, N, I0 I4 Uand capacity characteristics. The selection of design geotechnical parameters is an
! ?* D& U+ o: b! J) @% F2 Ressential component of both design stages, and some approximations for estimating the
" W& e$ N6 Y0 w5 X* cnecessary parameters are summarized.
, m( h# f1 y, E* a$ \6 S, oTypical applications to a case history of a piled raft and to model centrifuge tests
9 u3 b# f7 ?/ \- n5 K, h% Lare described, and it is found that the behavior predicted by the simplified analysis is
broadly consistent with the measured behavior."
Simplified Design Procedure for Piled Raft Foundations - H.G. Poulos, Fellow, ASCE.rar (677.45 KB, Lượt tải về: 57)

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