Finite Element Analysis of Axisymmetric
Conical Shell Raft Foundation

 

Dilip Kumar Maharaj

Assistant Professor, Civil Engineering Group Birla Institute of Technology and Science, Pilani, Rajasthan, India e-mail: dilip_maharaj@yahoo.com , dkm@bits-pilani.ac.in

Desika P. Lakshmi

Student, Civil Engineering Group

Birla Institute of Technology and Science, Pilani, Rajasthan,India

ABSTRACT

In this paper an axisymmetric shell raft foundation has been analysed by nonlinear finite element method. The shell raft and soil has been discretized into four noded isoparametric finite elements. The soil has been modeled as Drucker-Prager elastoplastic medium. The effect of soil modulus, pile and pile stiffness on the load settlement behaviour of shell raft has been studied. The load settlement curves of shell raft, shell raft with pile and the regular raft have been compared. The effect of increase in soil modulus has been found to improve the load carrying capacity of the shell raft foundation. The addition of even a single pile below a shell raft increases its load carrying capacity. The effect of increase in pile modulus has been found to increase the load carrying capacity and reduce the settlement of the shell raft. The improvement in load carrying capacity due to increase in stiffness is only up to limiting value of pile stiffness. The load carrying capacity of a shell raft foundation has been found more than that of the regular raft foundation

Keywords: Analysis, Nonlinear, Settlement, Shell Raft, Raft, Pile

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