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During the last decade, there has been great concern about fire applied loading effect on structural steel frames and their elements, especially when instability phenomenon arises due to high temperatures [1].The objective of this paper is to study the fire behaviour of I-beam steel simply supported members with and without web openings under lateral torsional buckling accounting geometric imperfection and residual stress. A nonlinear geometric and material analysis, with the Newton-Raphson time step solution, was done using finite element software ANSYS. The analysis investigates the overall displacement and the LTB moment capacity of hot rolled steel section for parent solid beams and their corresponding cellular beams. . The first part of the numerical simulation results are confronted with those obtained by Peter et al. [2]. In the second part where both imperfections are computed for lateral torsional buckling analysis, comparison is made with those calculated according to Eurocode EN 1993-1-2 [3] for solid beam and with analytical formulation from Panedpojaman, P. et al. for cellular beam [4]. info:eu-repo/semantics/publishedVersion |
