A 3D beam element to study torsion of steel open sections exposed to fire

摘要

Although many finite elements are well suited for the analysis of structures in fire, 3D beam elements employed in many commercial software do not properly account for the degradation of the torsional properties with the temperature. In this context, an enhanced 3D beam element based on a co-rotational formulation is proposed. The element was specifically developed for steel elements and is well suited for the analysis of structures that exhibit a significant torsional behavior. Two case studies are investigated by means of the developed element and of two different software (ABAQUS and SAFIR). The outcomes confirmed the effectiveness of the proposed element.