Fire design of steel beams with welded class 4 cross-section

Carlos Couto, Paulo Vila Real, Nuno Lopes, Bin Zhao


The present paper deals with the study of the lateral torsional buckling of steel beams with welded class 4 cross-sections in case of fire. A numerical study of several beams with different class 4 cross-sections submitted to uniform bending moment at elevated temperatures has been performed using the finite element method. The results are compared with existing simplified design rules of Part 1.2 of Eurocode 3 showing that these rules are too conservative. A comparison is also made with the proposed method in the French National Annex. Based on these comparisons a new proposal is presented to check the lateral torsional buckling resistance which is validated against the numerical simulations.

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