Finite Element Analysis of Strip Type Shell Foundation and Its Interaction

 

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

D. Chandana and S. Madhuri

Students, Civil Engineering Group
Birla Institute of Technology and Science, Pilani, Rajasthan,India

ABSTRACT

In this research paper the load settlement behaviour and interaction between strip shell footings have been analysed by Nonlinear Finite Element Method considering soil as elastoplastic material. The elastoplastic behaviour of soil has been modeled by Drucker-Prager Yield Criterion. The shell and soil continuum have been discretized into four noded isoparametric elements. The load settlement curves for a single strip footing and that of an individual footing in a group of two strip footings have been presented for different soil modulus. The effect of increase in soil modulus has been found to increase the load carrying capacity of the shell foundation. This increase is seen even at smaller load. The load carrying capacity of an individual shell foundation is maximum than a unit of shell foundation interacting with each other. The interaction is found maximum when the footings are at closer spacing and this interaction is found to reduce with increase in spacing. Hence it is suggested that while designing a strip shell footings, the spacing between the two must be kept at a distance such that each of the shells behaves as an individual footing. In other words the distance between the two shells should be kept such that the interaction effect is almost zero.

Keywords: Analysis, Strip type shell , Foundation, Interaction, Settlement, Unit shell

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