Buckling of steel and composite steel and concrete columns in case of fire

Abstract

Bare steel columns are known to have a very low fire resistance. The high thermal conductivity and the sudden decrease of the steel yield stress and Young Modulus in function of the temperature are responsible for this behaviour. The purpose of this study is to compare different modes of failure of building steel columns. The buckling of the columns is strongly influenced by the contact with other elements such as brick walls. Three types of situations were compared: steel columns embedded on brick walls, bare steel columns and composite columns made of partially encased steel sections. The deformed shapes of the columns are analyzed in this work.