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Abstract
0 F) |9 M( i: T, m"In situations where a raft foundation alone does not satisfy the design requirements, it
+ G: o6 f7 d( F+ {may be possible to enhance the performance of the raft by the addition of piles. The use; s2 \. p5 r+ V/ S
of a limited number of piles, strategically located, may improve both the ultimate load
* _. C4 S9 j& M- H0 ?, l) z: Zcapacity and the settlement and differential settlement performance of the raft. This+ l! {! O0 R2 G; j' X+ f
paper outlines the development of a simplified method of analysis which can provide a
3 ]% `) ^: J6 U* Yuseful tool for preliminary design of piled raft foundations. It involves two phases:
/ Y0 M2 _4 c) N! h, k( ?7 p1. The assessment of the overall foundation behavior;1 N7 W$ L; U$ B! Q$ _
2. The assessment of the behavior under individual column loads.* w% V* t& `! ~/ V5 ^
In both cases, use is made of simplified solutions to compute foundation stiffness
1 x6 @0 H3 N6 u' g/ O9 \and capacity characteristics. The selection of design geotechnical parameters is an- G- s) F# V1 d8 U% m, r% h2 i
essential component of both design stages, and some approximations for estimating the9 n5 y; h1 E% u6 w% Z# ~5 Y1 C
necessary parameters are summarized., G. B4 K9 F p
Typical applications to a case history of a piled raft and to model centrifuge tests
4 L: M0 c5 L( h/ Q0 M5 W3 p0 Lare described, and it is found that the behavior predicted by the simplified analysis is- y, w, G6 D* R1 t# I; k
broadly consistent with the measured behavior."5 j- z) t/ Q7 `$ p; o) S
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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