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Abstract: This article derives bending moment–axial force (M–P) interaction curves for mild steel by considering elastic–plastic and strain hardening idealisations with linear and parabolic strain hardening characteristics. The interaction relations can predict strains, which is not possible in a rigid, perfectly plastic idealisation. The parameters required are obtained from a standard uniaxial tension test and the procedure can be used for many other materials. [Copyright &y& Elsevier]