Abstract: Since the density and specific heat of aluminum alloy are different from that of steel, the heating process of aluminum alloy component is obviously different from that of steel component under ISO 834 standard heating condition. In order to get a simplified method for calculating the temperature rise of aluminum alloy components with light fire protection, the temperature rise curve of aluminum alloy components with light fire protection under ISO 834 standard temperature curve was calculated by incremental method, and the data were analyzed and fitted by nonlinear fitting. A simplified method for calculating the temperature rise of aluminum alloy components with light fire protection was obtained, and then the thickness of fire protection could be determined according to the critical temperature and the limit refractory time of aluminum alloy components. The results show that the temperature rate of aluminum alloy members with the same section is faster than that of steel members under the same heating conditions

Key words: aluminum alloy components, light fire protection;fire, temperature change