Abstract: In order to study the rationality of smoke control system design in waiting hall under the condition of the physical fire test, the fire test of the shop was carried out first. Flashover occurred in the shop at 814 s, and the maximum heat release rate was 12.9 MW at 993 s. This data was then input into FDS to conduct research on smoke exhaust in the waiting hall under four different window opening modes, and compared and analyzed the smoke spreading law, temperature, visibility and wind speed changes in the waiting hall. The results show that after the exhaust window is opened, the smoke layer and visibility interface are increased by 10 m and 8 m respectively, and the natural exhaust effect is obvious. The temperature at a height of 2 m above the interlayer ground in the four window opening modes within 1 800 s is less than 60 oC, the visibility is greater than 10 m, and the wind speed of the natural supplementary air outlet in the four directions is less than 3 m/s, which can ensure the safe evacuation of personnel. At the same time, the smoke exhaust efficiency of the roof window is much higher than that of the high side window. The difference between the smoke layer and the visibility interface of the high side window with a window ratio of 4% and the top window with a window ratio of 0.64% is only 1 m. The design of the smoke control system can meet the needs of safe evacuation of people under different window opening modes, but priority should be given to smoke exhaust from the roof window and increase the smoke exhaust area of the roof window.

Key words: shop fire, fire experiment, waiting hall, natural smoke exhaust, numerical simulation