Through theoretical analysis

the formula of lateral-torsional buckling resistance of aluminum beams in fire is devised.Based on 54 integral stability coefficient versus equivalent slenderness ratio（φb-λ）curves for the beams of 6061-T6 aluminum alloy obtained from numerical simulation analysis at elevated temperatures

a fitting φb-λ curve was proposed to estimate the integral stability coefficient for the flexural-torsional buckling of beams at elevated temperatures.The proposed fitting curve was compared with Eurocode 9.The results show that the suggested method can accurately predict the lateral-torsional buckling resistances of domestic structural aluminum beams in fire.