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PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY
Edited by: M. Papadrakakis and B.H.V. Topping
Finite Element Analysis of Conical Shell Foundations
A.A. Al-Azzawi, R.J. Aziz and A.A. Al-Ani
Department of Civil Engineering, Nahrain University, Iraq
A.A. Al-Azzawi, R.J. Aziz, A.A. Al-Ani, "Finite Element Analysis of Conical Shell Foundations", in M. Papadrakakis, B.H.V. Topping, (Editors), "Proceedings of the Sixth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 170, 2008. doi:10.4203/ccp.89.170
Keywords: analysis, conical, finite element, elastic foundation, shells, Winkler model.
In this paper, conical shell foundations are investigated. The two components of the interacting system; the soil and the shell foundation, are modelled using the finite element method. In this study, eight-node isoparametric degenerated shell element with five degrees of freedom at each node is used. The soil-structure interaction between the shell elements and the supporting medium are modelled by representing the soil medium by certain analytical equivalent such as the Winkler model with both normal compressional and tangential frictional resistances. This model assumes the soil medium to consist of a system of independent spring elements. The displacement occurs immediately under the loaded area and outside this region; the displacement is zero. The problem is analysed using the computer program named SFAP (Shell Foundation Analysis Program) , which was developed from a program named PLAST  by adding subroutines of foundation properties and stiffnesses in order to be capable of solving different types of shell foundations. Comparison between the results obtained by the present analysis and those obtained by other investigations are made. The present analysis shows satisfactory results when compared with those obtained by other studies The percentage difference in results (for the vertical displacement) between the present study and Kurian study in 1993  is about 0.077%. The percentage difference in results between the present study and Hassan study in 2002  is about 2.439%. Parametric studies have been carried out to investigate the effect of some important parameters on the behaviour of shell foundations. Three parameters are considered which are: semi-vertical angle, conical shell thickness and vertical subgrade reaction.
The major conclusions obtained from the study of the conical shell foundation are:
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