Elastic-Plastic Analysis of Bending Moment – Axial Force Interaction in Metallic Beam of T-Section

This paper derives kinematic admissible bending moment – axial force (M-P) interaction relations for mild steel by considering elastic-plastic idealisations. The interaction relations can predict strains, which is not possible in a rigid, perfectly plastic idealization. The relations are obtained for all possible cases pertaining to the locations of neutral axis. One commercial rolled steel T-section has been considered for studying the characteristics of interaction curves for different models. On the basis of these interaction curves, most significant cases for the position of neutral axis which are enough for the establishment of interaction relations have been suggested.