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Abstract

SAFIR is finite element software for the thermal and mechanical analysis of structures exposed to fire. For mechanical analysis, a library of different elements is available in SAFIR: truss, beam, etc. In order to increase SAFIR's capabilities, a quadrangular shell element has been implemented. This element is not subject to 'locking' (or over-stiffness) in the case of 'membrane bending'. Different material models can be used. These are plasticity models based on the von Mises surface (for isotropic materials), plus a Rankine tension cut off for concrete. The parameters of the models as well as the hardening laws have been chosen in such a way as to fit the recommendations of Eurocode 2 and 3 for uniaxial stress–strain curves of concrete and steel under fire condition. Some verification and validation examples at room and at elevated temperatures are presented.

Keywords

SAFIR finite element shell thermal fire exposure structures in fire

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A Quadrangular Shell Finite Element for Concrete and Steel Structures Subjected to Fire

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