Profil- und systemabhängige Tragfähigkeiten biegedrillknickgefährdeter Träger aus gewalzten I-Profilen

Influence of cross sections and static systems on the load bearing capacity of rolled I-section beams subjected to lateral torsional buckling.

This paper analyses the load-bearing behaviour of beams subjected to lateral torsional buckling. Single span beams, two-span beams and cantilever beams in uniaxial bending are chosen as basic systems. In addition to the length and the cross section the static system influences the bearing characteristics and capacities. The results of a comprehensive numerical parameter study indicates a large scatter of the bearing capacities.
The bearing behaviour is characterised by different failure criteria. The decisive slenderness range of the criteria depends on the static system and the cross section. These results can be used to review commonly used analytical methods. The large scatter of the comparative study indicates that simplified models have difficulties in describing the influence of the static system and the cross section on the load bearing behaviour. Finally the paper presents an Iy/IT-ratio dependent approach for each system. Especially for the single span beam this approach reduces the scatter to 4 % in the main application range.