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Effect of localised fires on continuous steel beams
The fire resistance of structures is usually evaluated on the basis of the ISO 834 standard temperature-time curve. If the design at room temperature has been based on the elastic theory, it is well-known that the fire resistance will be higher in a continuous steel beam than in the same beam on simple supports. Furthermore experimental results derived from fire tests show that the fire resistance of continuous beams is higher than the one that can be expected from theoretical considerations, due to real thermal exchange conditions. Tentatives are presently made to develop more realistic approaches representing the fire development, like two zone models and localised fires. In this latter case, the fire endurance will also be affected by the support conditions of the steel beam, but the difference will be rather different from that corresponding to a one zone model. In this paper, numerical examples on simply supported and continuous steel beams submitted to the ISO fire and to two different types of localised fires are presented. The fire endurance of continuous beams is influenced by the type of fire and can be considerably increased compared to the fire resistance of simply supported beams. Additional research studies should be performed regarding the conditions of application of localised fires in order to avoid the evaluation of excessive and unrealistic fire resistance durations.
Effect of localised fires on continuous steel beams
The fire resistance of structures is usually evaluated on the basis of the ISO 834 standard temperature-time curve. If the design at room temperature has been based on the elastic theory, it is well-known that the fire resistance will be higher in a continuous steel beam than in the same beam on simple supports. Furthermore experimental results derived from fire tests show that the fire resistance of continuous beams is higher than the one that can be expected from theoretical considerations, due to real thermal exchange conditions. Tentatives are presently made to develop more realistic approaches representing the fire development, like two zone models and localised fires. In this latter case, the fire endurance will also be affected by the support conditions of the steel beam, but the difference will be rather different from that corresponding to a one zone model. In this paper, numerical examples on simply supported and continuous steel beams submitted to the ISO fire and to two different types of localised fires are presented. The fire endurance of continuous beams is influenced by the type of fire and can be considerably increased compared to the fire resistance of simply supported beams. Additional research studies should be performed regarding the conditions of application of localised fires in order to avoid the evaluation of excessive and unrealistic fire resistance durations.
Effect of localised fires on continuous steel beams
Der Einfluss örtlicher Brände auf durchgängige Stahlträger
Gens, F. (author) / Franssen, J.M. (author) / Dotreppe, J.C. (author)
2005
8 Seiten, 11 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
Effect of localised fires on continuous steel beams
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