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Abstract
; |# G. F3 I: ]6 ~# n! @"In situations where a raft foundation alone does not satisfy the design requirements, it5 j5 Y7 w% t4 e& c! j8 r6 |
may be possible to enhance the performance of the raft by the addition of piles. The use x* {$ u8 w: B+ M7 i
of a limited number of piles, strategically located, may improve both the ultimate load
. s3 D- H1 B5 U9 N8 t* _0 icapacity and the settlement and differential settlement performance of the raft. This6 N$ L! }% a7 Z* D5 I+ \# z2 A
paper outlines the development of a simplified method of analysis which can provide a
. t5 ^1 x! ?4 ^8 O% h& y3 e. xuseful tool for preliminary design of piled raft foundations. It involves two phases:
, e1 Z1 @) U4 @; W1. The assessment of the overall foundation behavior;
2 J" g" q# _0 ?; z) O2. The assessment of the behavior under individual column loads.
i. b3 l/ |$ H% O- y5 {0 KIn both cases, use is made of simplified solutions to compute foundation stiffness
: _0 v: f: g5 q/ ~! }and capacity characteristics. The selection of design geotechnical parameters is an1 Z$ [0 m) M5 r0 E
essential component of both design stages, and some approximations for estimating the
6 q9 c2 \# `& u. j' [necessary parameters are summarized.
# _& r; ~, x& n6 GTypical applications to a case history of a piled raft and to model centrifuge tests
$ O' I6 [6 r$ d/ H" zare described, and it is found that the behavior predicted by the simplified analysis is
! c7 O. t/ c5 m. L2 B. N+ o$ }broadly consistent with the measured behavior."
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Simplified Design Procedure for Piled Raft Foundations - H.G. Poulos, Fellow, ASCE.rar
(677.45 KB, Lượt tải về: 57)
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Đăng lúc 16/5/2011 15:49:17
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