Advanced Steel Construction

Vol. 5, No. 3, pp. 289-302 (2009)



Yuanyuan Song 1,*, Zhaohui Huang 1, Ian W. Burgess 1 and Roger J. Plank 2

1 Department of Civil and Structural Engineering, The University of Sheffield, Sheffield S1 3JD, UK

2 School of Architectural Studies, The University of Sheffield, Sheffield S10 2TN, UK,

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)


Received: 27 November 2007; Revised: 11 March 2008; Accepted: 27 March 2008




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.



Keywords:Dynamic analysis, temporary failure, snap-through, steel portal frames


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