Impact of Coefficient of Subgrade Reaction on Raft Foundation Design

Winkler method is widely used in computer analysis of raft foundations due to its simplicity. In this method, soil is represented as medium consisting of infinite number of elastic, identical, but independent springs. The stiffness of the springs is the coefficient of subgrade reaction, ks. The...

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Main Authors: Sambu Potty, Narayanan, V, Thulaseedharan
Format: Citation Index Journal
Published: 2013
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Online Access:http://eprints.utp.edu.my/10656/1/09_19692%20-%20IJAER__pp%20187-201__new_corrected.pdf
http://eprints.utp.edu.my/10656/
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Institution: Universiti Teknologi Petronas
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spelling my.utp.eprints.106562017-01-19T08:21:12Z Impact of Coefficient of Subgrade Reaction on Raft Foundation Design Sambu Potty, Narayanan V, Thulaseedharan TA Engineering (General). Civil engineering (General) Winkler method is widely used in computer analysis of raft foundations due to its simplicity. In this method, soil is represented as medium consisting of infinite number of elastic, identical, but independent springs. The stiffness of the springs is the coefficient of subgrade reaction, ks. The inadequacy of this modeling to account for the elastic continuity of soil is its serious limitation. The computation of ks is very difficult as it depends on several factors like stiffness of raft and superstructure, soil properties and depth of embedment of foundation. Hence the accuracy of analysis of raft foundation depends on the estimate of representative ks considering the above factors. The present study was carried out to investigate the impact of changing coefficient of subgrade reaction values in the design of raft foundation. General trends were established for the variation of bending moment, shear and settlement of raft with change in values of ks. The Winkler method is then compared with continuum modeling of soil. Finally two rafts were designed varying ks values and its impact on structural design and cost of execution is presented. 2013 Citation Index Journal PeerReviewed application/pdf http://eprints.utp.edu.my/10656/1/09_19692%20-%20IJAER__pp%20187-201__new_corrected.pdf Sambu Potty, Narayanan and V, Thulaseedharan (2013) Impact of Coefficient of Subgrade Reaction on Raft Foundation Design. [Citation Index Journal] http://eprints.utp.edu.my/10656/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Sambu Potty, Narayanan
V, Thulaseedharan
Impact of Coefficient of Subgrade Reaction on Raft Foundation Design
description Winkler method is widely used in computer analysis of raft foundations due to its simplicity. In this method, soil is represented as medium consisting of infinite number of elastic, identical, but independent springs. The stiffness of the springs is the coefficient of subgrade reaction, ks. The inadequacy of this modeling to account for the elastic continuity of soil is its serious limitation. The computation of ks is very difficult as it depends on several factors like stiffness of raft and superstructure, soil properties and depth of embedment of foundation. Hence the accuracy of analysis of raft foundation depends on the estimate of representative ks considering the above factors. The present study was carried out to investigate the impact of changing coefficient of subgrade reaction values in the design of raft foundation. General trends were established for the variation of bending moment, shear and settlement of raft with change in values of ks. The Winkler method is then compared with continuum modeling of soil. Finally two rafts were designed varying ks values and its impact on structural design and cost of execution is presented.
format Citation Index Journal
author Sambu Potty, Narayanan
V, Thulaseedharan
author_facet Sambu Potty, Narayanan
V, Thulaseedharan
author_sort Sambu Potty, Narayanan
title Impact of Coefficient of Subgrade Reaction on Raft Foundation Design
title_short Impact of Coefficient of Subgrade Reaction on Raft Foundation Design
title_full Impact of Coefficient of Subgrade Reaction on Raft Foundation Design
title_fullStr Impact of Coefficient of Subgrade Reaction on Raft Foundation Design
title_full_unstemmed Impact of Coefficient of Subgrade Reaction on Raft Foundation Design
title_sort impact of coefficient of subgrade reaction on raft foundation design
publishDate 2013
url http://eprints.utp.edu.my/10656/1/09_19692%20-%20IJAER__pp%20187-201__new_corrected.pdf
http://eprints.utp.edu.my/10656/
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