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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 102
Edited by: B.H.V. Topping and P. Iványi
Paper 7

A Numerical Study on the Behaviour of Hollow and Concrete Filled Oval Columns in Fire

F. Ali, N. Goodfellow and A. Nadjai

FireSERT, School of the Built Environment
University of Ulster, United Kingdom

Full Bibliographic Reference for this paper
F. Ali, N. Goodfellow, A. Nadjai, "A Numerical Study on the Behaviour of Hollow and Concrete Filled Oval Columns in Fire", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 7, 2013. doi:10.4203/ccp.102.7
Keywords: fire, concrete filled columns, finite element model.

This paper presents the outcomes of experimental research to investigate the performance of axially restrained elliptical hollow and concrete filled (EHS) steel columns subjected to severe hydrocarbon fire. The test programme involved an oval section 400*200*8 mm yielding slenderness of 24. The 1800 mm columns were tested under loading ratios ranging between 0.2 and 0.6 of the ultimate strength determined using EC3 and under axial restraint ranging from 0 to 0.15. It was found that introducing restraint to the elliptical section columns decreases the time to failure which is more evident in the case of lower load ratios than the higher load ratios. The results from the experimental work were then used to validate a finite element model which showed good agreement in the prediction of failure times and mechanisms observed during the tests. The finite element model successfully predicted tests results of modes of failure, variance in thermal expansion of steel and concrete and thermal distribution in concrete core.

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