Impact of Coefficient of Subgrade Reaction on Raft Foundation Design

Sambu Potty, Narayanan and V, Thulaseedharan (2013) Impact of Coefficient of Subgrade Reaction on Raft Foundation Design. [Citation Index Journal]

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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.

Item Type:Citation Index Journal
Uncontrolled Keywords:Raft foundation, Winkler model, coefficient of subgrade reaction, continuum analysis, Mohr-Coulomb model, settlement of rafts.
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Academic Subject One:Academic Department - Civil Engineering - Structures, materials and construction
Departments / MOR / COE:Research Institutes > Institute for Sustainable Building
ID Code:10656
Deposited On:16 Dec 2013 23:48
Last Modified:19 Jan 2017 08:21

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