PN-EN1993-1-1 limits the carrying capacity of sections of class 3 to a value which results from the beginning of the plasticizing compression zone. During the bending of monosymmetrival cross section (with compression flange greater than tension flange) normal stresses reaches as first the yield strength in the tension zone. In this case, cross section has a some reserve of capacity, resulting from the failure to achieve the yield strength in the most intensive compression fibers. This article describe how to determine the resistance based on the elastic-plastic stress distribution in monosymmetrical cross section and using the appropriate equilibrium conditions.
Keywords: monosymmetrical cross section, elastic-plastic capacity