在地下大空间建筑的全尺寸火灾试验基础上,研究在有无吊顶、不同排烟状态下的火灾烟气特性。试验结果证明,虽然有吊顶可促进排烟,但此时烟气流速增大,因此空心吊顶可能造成烟气积蓄。由于烟气会在中庭迅速蔓延,因此需用防火卷帘将中庭和相邻楼层迅速隔离,至少与一楼和着火楼层相隔离,同时应开启排烟系统。 On the basis of the full-scale fire test of underground large-space buildings, the characteristics of fire flue gas with or without smoke ceiling are studied. Test results show that, although the ceiling can promote smoke exhaust, but the flue gas flow rate increases at this time, so hollow ceiling may cause flue gas accumulation. Due to the rapid spread of flue gas in the atrium, a fire shutter should be used to quickly isolate the atrium from the adjacent floor, at least on the first floor and on the fire floor, with the smoke extraction system on.