Fire behavior of composite columns made with hollow steel profiles filled with reinforced concrete

Building use

Office building

Country/Region

All Regions

Overview

The purpose of the research is to compare the results obtained by three different and easy-to use methods for the determination of the fire behavior of composite columns made with hollow steel profiles filled with reinforced concrete. It thus compares the experimental results of a study found in the literature and well described in terms of results, with what can be obtained by using two software (Safir and Potfire) and an empirically-derived formula proposed by Kodur (KODUR V.K.R., MACKINNON D.H., Design of concrete filled hollow structural steel columns for fire endurance, Engineering Journal, 37(1), 13-24, 2000). The research gives some guidance on what method can be used under which circumstance.

Issue and/or innovation

The research stems from the consideration that the design calculation proposed by Eurocode 4 to describe the behavior of concrete-filled hollow steel sections in the Eurocode 4, though effective, are in some circumstances too difficult to be applied during the design stage of buildings by normal designers. At the same time, in all the studies mentioned in the references, it is clearly demonstrated that the experimental results display a large dispersion, and therefore it is difficult to propose theoretical formulas or methods that are at the same time safe and economical.

Technical details

Hollow steel columns filled with bar-reinforced concrete are used extensively in the construction of high-rise buildings. Many research works devoted to the fire resistance of these profiles have been performed in Europe and in North America. Though calculation methods are now proposed in codes, more practical tools are needed by the design engineers. It is not easy to develop such methods due to the large scatter of experimental results. In this article three methods based on quite different procedures are examined. Comparisons have been made between the results obtained by the three methods and test results. The potentialities of each method are examined, but also the domains in which they should be used with care, or even they should not be used.

References / Technical Papers Content

F. FELLAH, J.C. DOTREPPE, A. SERIDI, J.M. FRANSSEN, “Résistance au feu des profils creux en acier remplis de béton”, 21ème Congrès Français de Mécanique, Bordeaux, 26 au 30 août 2013
https://hal.science/hal-03441233v1/document

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Fire behavior of composite columns made with hollow steel profiles filled with reinforced concrete