Class 4 sections at elevated temperature

Jan Hricák, František Wald, Michal Jandera

Abstract


The steel cross-sections behave stable or unstable. The behavior of slender cross sections of steel beams is influenced by local buckling. The buckling can be observed on beam web and/or flange and reduce the load bearing capacity of the beam. Design models adopted for daily design procedures are based on the so-called effective width approach. The design at fire situation is simplified which means that the same effective cross section as for cold design is used neglecting the changes of stiffness of steel. The research is focused on getting the knowledge of behaving of steel beams with welded Class 4 cross-sections exposed to high temperatures. This article describes the progress of the experiments.

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