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A new dynamic model and a quasi-static solution procedure has been developed and incorporated into the finite element software Vulcan (1-3). This new numerical model is tested in this paper on benchmark problems which relate to the behaviour of steel portal frames under fire conditions. The capabilities and the accuracy of this numerical model have been validated against other advanced finite element software (ABAQUS (4), ANSYS (5) and SAFIR (6)). A case study on the behaviour of steel portal frames under fire conditions has been carried out using this new tool. The effects of different rotational stiffnesses at the column bases are compared for two different heating profiles. A second failure mechanism, based on large deformation rather than the initial configuration of the steel portal frames, is observed after an initial instability of the roof frame has re-stabilised in an inverted configuration at high temperatures.

THE BEHAVIOUR OFSINGLE-STOREY INDUSTRIAL STEEL FRAMES IN FIRE