An approximate analysis procedure for piled raft foundations

P. Clancy, Mark Randolph

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

A piled raft foundation comprises both piles and a pile cap that itself transmits load directly to the ground. The aim of such a foundation is to reduce the number of piles compared with a more conventional piled foundation where the bearing effect of the pile cap, or raft, is ignored. This paper describes a 'hybrid' approach for the analysis of piled raft foundations, based on a load transfer treatment of individual piles, together with elastic interaction between different piles and with the raft. The numerical analysis is used to evaluate a simple approximate method of estimating the overall response of the foundation from the response of the component parts. The method leads to estimates of the overall foundation stiffness, the proportion of load carried by the pile group and the raft, and an initial assessment of differential settlements. Parametric studies are presented showing the effect of factors such as raft stiffness and pile spacing, length and stiffness, and a worked example is included demonstrating the accuracy of the approximate design approach.
Original languageEnglish
Pages (from-to)849-869
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume17
DOIs
Publication statusPublished - 1993

Fingerprint

Piles
pile
stiffness
Stiffness
Bearings (structural)
pile group
analysis
spacing
Numerical analysis
Loads (forces)

Cite this

@article{ae25e7c8c0f941719f086ca9c1b70b61,
title = "An approximate analysis procedure for piled raft foundations",
abstract = "A piled raft foundation comprises both piles and a pile cap that itself transmits load directly to the ground. The aim of such a foundation is to reduce the number of piles compared with a more conventional piled foundation where the bearing effect of the pile cap, or raft, is ignored. This paper describes a 'hybrid' approach for the analysis of piled raft foundations, based on a load transfer treatment of individual piles, together with elastic interaction between different piles and with the raft. The numerical analysis is used to evaluate a simple approximate method of estimating the overall response of the foundation from the response of the component parts. The method leads to estimates of the overall foundation stiffness, the proportion of load carried by the pile group and the raft, and an initial assessment of differential settlements. Parametric studies are presented showing the effect of factors such as raft stiffness and pile spacing, length and stiffness, and a worked example is included demonstrating the accuracy of the approximate design approach.",
author = "P. Clancy and Mark Randolph",
year = "1993",
doi = "10.1002/nag.1610171203",
language = "English",
volume = "17",
pages = "849--869",
journal = "International Journal of Numerical and Analytical Methods in Geomechanics",
issn = "0363-9061",
publisher = "John Wiley & Sons",

}

TY - JOUR

T1 - An approximate analysis procedure for piled raft foundations

AU - Clancy, P.

AU - Randolph, Mark

PY - 1993

Y1 - 1993

N2 - A piled raft foundation comprises both piles and a pile cap that itself transmits load directly to the ground. The aim of such a foundation is to reduce the number of piles compared with a more conventional piled foundation where the bearing effect of the pile cap, or raft, is ignored. This paper describes a 'hybrid' approach for the analysis of piled raft foundations, based on a load transfer treatment of individual piles, together with elastic interaction between different piles and with the raft. The numerical analysis is used to evaluate a simple approximate method of estimating the overall response of the foundation from the response of the component parts. The method leads to estimates of the overall foundation stiffness, the proportion of load carried by the pile group and the raft, and an initial assessment of differential settlements. Parametric studies are presented showing the effect of factors such as raft stiffness and pile spacing, length and stiffness, and a worked example is included demonstrating the accuracy of the approximate design approach.

AB - A piled raft foundation comprises both piles and a pile cap that itself transmits load directly to the ground. The aim of such a foundation is to reduce the number of piles compared with a more conventional piled foundation where the bearing effect of the pile cap, or raft, is ignored. This paper describes a 'hybrid' approach for the analysis of piled raft foundations, based on a load transfer treatment of individual piles, together with elastic interaction between different piles and with the raft. The numerical analysis is used to evaluate a simple approximate method of estimating the overall response of the foundation from the response of the component parts. The method leads to estimates of the overall foundation stiffness, the proportion of load carried by the pile group and the raft, and an initial assessment of differential settlements. Parametric studies are presented showing the effect of factors such as raft stiffness and pile spacing, length and stiffness, and a worked example is included demonstrating the accuracy of the approximate design approach.

U2 - 10.1002/nag.1610171203

DO - 10.1002/nag.1610171203

M3 - Article

VL - 17

SP - 849

EP - 869

JO - International Journal of Numerical and Analytical Methods in Geomechanics

JF - International Journal of Numerical and Analytical Methods in Geomechanics

SN - 0363-9061

ER -