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Fire resistance of partially encased composite columns subjected to eccentric loading

Abdelkadir Fellouh (Hassiba Benbouali University of Chlef, Chlef, Algeria)
Abdelkader Bougara (Hassiba Benbouali University of Chlef, Chlef, Algeria)
Paulo Piloto (Applied Mechanics, Instituto Politécnico de Bragança, Mirandela, Portugal)
Nourredine Benlakehal (Hassiba Benbouali University of Chlef, Chlef, Algeria)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Article publication date: 11 January 2022

Issue publication date: 22 September 2022




Investigate the fire performance of eccentrically loaded concrete partially encased column (PEC), using the advanced calculation method (ANSYS 18.2, 2017) and the simple calculation method in Annex G of Eurocode 4 (EN 1994-1-2, 2005). This work examines the influence of a range of parameters on fire behaviour of the composite column including: eccentricity loading, slenderness, reinforcement, fire rating and fire scenario. In this study, ISO-834 (ISO834-1, 1999) was used as fire source.


Currently, different methods of analysis used to assess the thermal behaviour of composite column exposed to fire. Analytical method named simplified calculation methods defined in European standard and numerical simulations named advanced calculation models are treated in this paper.


The load-bearing capacity of the composite column becomes very weak in the presence of the fire accident and eccentric loading, this recommends to avoid as much as possible eccentric loading during the design of construction building. The reinforcement has a slight influence on the temperature evolution; moreover, the reinforcement has a great contribution on the load capacity, especially in combined compression and bending. When only the two concrete sides are exposed to fire, the partially encased composite column presents a high load-bearing capacity value.


The use of a three-dimensional numerical model (ANSYS) allowed to describe easily the thermal behaviour of PEC columns under eccentric loading with the regard to the analytical method, which is based on three complex steps. In this study, the presence of the load eccentricity has found to have more effect on the load-bearing capacity than the slenderness of the composite column. Introducing a load eccentricity on the top of the column may have the same a reducing effect on the load-bearing capacity as the fire.



Fellouh, A., Bougara, A., Piloto, P. and Benlakehal, N. (2022), "Fire resistance of partially encased composite columns subjected to eccentric loading", Journal of Structural Fire Engineering, Vol. 13 No. 4, pp. 451-469.



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