Hossein Hatami - Department of Civil Engineering, Lorestan University, Khorram Abad, Iran
Mojtaba Hosseini - Department of Mechanical Engineering, Lorestan University, Khorram Abad, Iran

This study derives kinematic admissible bending moment – axial force (M-P) interaction relations for mild steel by considering elastic-plastic idealizations. 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 is 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 are suggested.

Elastic-Plastic Analysis, Mild Steel, T–Section, M-P interaction, Bending Moment