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

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Abstract
# u# t% p& s5 m* l$ m# J"In situations where a raft foundation alone does not satisfy the design requirements, it
$ Y# @* c! J% U3 i# h5 z2 Pmay 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
' O0 t/ O7 ]' Bcapacity and the settlement and differential settlement performance of the raft. This
" X8 t8 J. v/ v& Y2 Npaper outlines the development of a simplified method of analysis which can provide a
! D" w6 r: P' K7 vuseful tool for preliminary design of piled raft foundations. It involves two phases:
0 {# A2 N- ^0 E+ d! s' K- A6 V- p1. The assessment of the overall foundation behavior;
8 i3 G' {; \( ?$ N' j( a3 D1 m/ W2. The assessment of the behavior under individual column loads.
- q  b, Z- B6 s) u' kIn both cases, use is made of simplified solutions to compute foundation stiffness
6 s) y9 |. E+ @6 K' O# kand capacity characteristics. The selection of design geotechnical parameters is an
essential component of both design stages, and some approximations for estimating the
( s$ I$ T3 S: }5 [! }' M2 `3 E! mnecessary parameters are summarized.
Typical applications to a case history of a piled raft and to model centrifuge tests
4 y4 `& {5 A1 Y* ^, oare described, and it is found that the behavior predicted by the simplified analysis is
# [. p; D  Q5 D8 v& ~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)

16/5/2011 15:48 Tải lên

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