Plastic resistance of channel sections under various internal forces

Analysis of plastic resistance of channel sections under combination of various internal forces is presented. Hot-rolled channel sections of Class 1, 2 or 3 are analysed. Elastic cross-sectional properties of hot-rolled channel sections may be taken also from German standard DIN 1026-2:2002-10, the other standards or the tables of profile producers. Roll formed channel sections may be seen in various steel constructions. The paper offers for channel sections the formulae for calculation of: a) cross-sectional elastic and plastic characteristics, b) elastic and plastic resistances including their maximum values which may be achieved with combination of other internal force. Numerical examples show details of calculation, comparison with results of other sources and interaction diagrams as well. The presented procedure will be useful for designers in practice, authors of computer programs and participants in educational processes.