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
0 P: w7 w- d6 D2 h$ f; hmay be possible to enhance the performance of the raft by the addition of piles. The use
' Z& f+ R( S# y3 pof a limited number of piles, strategically located, may improve both the ultimate load
0 [8 R6 t  X% P2 Jcapacity 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
% |0 a* W: S! D7 {5 U8 iuseful tool for preliminary design of piled raft foundations. It involves two phases:
1. The assessment of the overall foundation behavior;
" Y# t0 c  a" E0 n2. The assessment of the behavior under individual column loads.
: J( i* v4 o% i: ^) N5 t8 SIn both cases, use is made of simplified solutions to compute foundation stiffness
' ^" C5 m8 g9 [4 U  \and capacity characteristics. The selection of design geotechnical parameters is an
  ?. h+ S! i+ _6 b7 Q7 Z( }essential component of both design stages, and some approximations for estimating the
necessary parameters are summarized.
) _5 v( a1 t( PTypical applications to a case history of a piled raft and to model centrifuge tests
are described, and it is found that the behavior predicted by the simplified analysis is
$ `0 Y0 M; e) l" d( kbroadly consistent with the measured behavior."
* D) `/ c, P" t6 o5 W4 w 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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