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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 30
Edited by: B.H.V. Topping
Paper VII.6

Effect of Subgrade Model on Capacity of Reinforced Concrete Footings

A.A. Khathlan and M.S.A. Abbasi

Civil Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

Full Bibliographic Reference for this paper
A.A. Khathlan, M.S.A. Abbasi, "Effect of Subgrade Model on Capacity of Reinforced Concrete Footings", in B.H.V. Topping, (Editor), "Developments in Computer Aided Design and Modelling for Civil Engineering", Civil-Comp Press, Edinburgh, UK, pp 163-169, 1995. doi:10.4203/ccp.30.7.6
The main objective of this study is to investigate the effect of the subgrade model on the ultimate capacity of reinforced concrete slabs. A general two-parameter subgrade model is selected and formulated into a finite element scheme based on a quadratic thick plate element. The elastic subgrade model is based on the concept of using two different types of elastic springs to represent the subgrade reactive pressure. Upon integrating the subgrade model into a complete nonlinear finite element scheme, it is possible to study the nonlinear response of square slabs resting on two-parameter elastic subgrades. The results include an investigation of the general effects of a two-parameter subgrade on the ultimate loads for several reinforced concrete slabs. Comparison is also made with similar results obtained using a single parameter (Winkler) model.

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