Abstract: Considering the factors that cause metro windows to be broken due to high temperature, using FDS software to study the development of metro cabin fires under different door opening and closing states, and analyzing the heat release rate (HRR), temperature distribution, window break time, etc. The results show that the number of door openings has a great influence on the heat release rate of the cabin fire, and the maximum heat release rate of the fire can reach 14.4 MW. At 400 ℃ and 600 ℃ crushing temperature, when the number of door openings is greater than 3 and 4, the maximum heat release rate of the compartment fire changes from increasing to decreasing. In the early stage of fire development, the number of door openings has little effect on the temperature distribution in the cabin. When the fire enters the full development stage, the opening of the door will cause a jump in temperature. For compartment fires, different door opening states will correspondingly affect the order, position and time of window breakage. When door 1 is opened, under 400 ℃ working condition, the window breaking time on both sides of the fire source is at most 1 066 s earlier than that under 600 ℃ working condition.

Key words: metro cabin fire, doors opening and closing status, broken window, heat release rate; temperature distribution