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This study assessed the inelastic lateral–torsional buckling behavior of steel I-beams under elevated temperatures. Numerical simulations were conducted using the finite element program ABAQUS. The beam models were subjected to uniform bending and varying temperature loads from a normal temperature of 20 °C to an elevated temperature of 600 °C. These thermal loads were applied at the compression flange, tension flange, half of the beam, and throughout the entire beam. The combined effects of residual stress and geometric imperfection on the inelastic buckling strengths of the beams were also considered. The results showed that the scenario in which the entire beam was heated demonstrated the highest strength degradation. In addition, the compression flange of the beam was observed to be critical; thus, the local buckling of the compression flange greatly contributed to the decrease in the buckling strength compared with the other cases.

Inelastic Lateral-Torsional Buckling Strength of Steel I-Beams under Non-Uniform Temperature Conditions