Influence of imperfections in the buckling resistance of steel beam-columns under fire

Abstract This paper presents an investigation on the influence of structural imperfections ultimate load capacity steel welded beam-columns with class 4 cross-section under elevated temperatures. is done by considering different amplitudes for global and local (plate) imperfections, residual stresses distributions available in literature. To this purpose, a geometrically materially non-linear finite element model using Abaqus software has been used to determine buckling resistance beam-column at temperatures, material properties EN1993-1-2. The imperfection sensitivity reported: influences geometric patterns stress are compared.