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Fire behavior of concrete-filled tubular columns with steel core
Involved researchers
Abstract
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Fire design is an important factor in the safe and economical design of
steel and steel-concrete composite structures. Fires in buildings may
have enormous consequences on life safety and economies. It is necessary
to get a fundamental knowledge of the structural behavior of
steel-concrete composite members in fire and develop safe, economical
and easy applicable calculation models, especially in case of buckling.
Concrete-filled steel tubular columns with steel cores have an
attractive architectural appearance due to the visible steel of the tube
and the high slenderness of the column. Concrete-filled steel tube
sections with steel cores are used for highly loaded columns and/or for
minimizing the size of the column. Under fire conditions the steel tube
is directly exposed to the fire and heats up quickly. The concrete
inside the tube decelerates the heating of the steel core. The reduced
strength and stiffness of steel and concrete at elevated temperatures
must be considered for calculating both the cross-sectional resistance
and slender column strength of steel-concrete composite sections. The research project aims at analyzing the load-carrying behavior of concrete-filled steel tubular columns with steel core subjected to fire. The intention is to develop a analytical model for this kind of steel-concrete composite sections subjected to axial compression and fire. This model will allow taking into account flexural buckling, residual stresses, temperature-dependent material properties for steel and concrete, thermal strains and stresses as well as standard ISO and natural fire exposures. After this, the project aims at improving the cross-sections used for the composite columns. |
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Key Publications
- Neuenschwander M., Knobloch M., Fontana M.:
"Numerische Modellierung des Tragverhaltens von betongefüllten Hohlprofilstützen mit Stahlkern unter ISO-Normbrandeinwirkung"
Festschrift Gerhard Hanswille, Bergische Universität Wuppertal, Institut für Konstruktiven Ingenieurbau, Heft 20, S. 353-362, 2011. - Neuenschwander M., Knobloch M., Fontana M.:
"Fire behaviour of concrete filled circular hollow section columns with massive steel core"
Proceedings of the International Colloquium Stability and Ductility of Steel Structures SDSS, September 8-10, 2010, Rio de Janeiro, Brazil.
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