Results of numerical analysis of steel truss member subjected to elevated temperature caused by fire are discussed in the paper. Steel strain is described using non-linear Bailey-Norton formula. Conditions of heating of steel and creep steel behaviour are included when estimating values of steel model parameters. Influence of buckling is taken into account. Balance of the member is described by modified equations of Vlasov's theory of thin-walled members. Numerical analysis is based on the finite difference method. Finally discussion on influence of various factors including slenderness ratio, load ratio and intensity of heating of steel on load capacity of the member is presented. Obtained results make it also possible to assess effect of steel creep on load capacity of analysed members and its interaction with other parameters.
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