A new residual stress distribution for hot-rolled I-shaped sections

During the procedure of manufacturing structural steel profiles the considerable temperature changes cause residual stresses in the material. These stresses can have a significant effect on the stability resistance of structures consisting of such profiles. Therefore engineers have paid special attention to the consideration and modelling of residual stresses in the comprehensive research into column buckling. They developed several stress distribution forms based on experimental and/or theoretical results, which worked well in column buckling problems. However, when the member has twisting displacements-e.g. in the case of lateral-torsional buckling-these stress distributions can lead to malfunction, because they do not satisfy certain equilibrium equations connected with torsion and warping of the profile. In order to avoid this problem a new stress pattern is proposed which satisfies all the equilibrium equations, thus being applicable in stability problems including torsional and warping effects.