建筑室外平台对烟气蔓延的抑制作用

The inhibition of building outdoor platform to the spread of the fire smoke

某城市广场利用外庭平台结构,将商业综合体的人员疏散同城市交通换乘相结合解决疏散问题。对其火灾时室外平台区域的烟气蔓延情况进行研究,利用FDS分别模拟楼层高度与室外平台宽度的不同比例对于烟气蔓延的影响,分析了烟气温度,能见度水平等主要安全指标,得出楼层高度与室外平台宽度比例在1∶0.6～1∶0.8之间时能较好地保障平台区域的人员疏散。并建议对室外平台同建筑的商业区域进行防火分隔,防止烟气蔓延到外庭区域。

Abstraet：A city plaza uses outdoor platform to combine the evacuation of shopping mall and urban traffic transfer, and solve the evacuation problems. The smoke spreading of the outdoor platform was studied, and FDS was used to research the influence of different ratio of building height and platform width to the smoke spreading, and analyze the smoke temperature and visibility. Results showed that the ratio of 1 ： 0.6- 1 ： 0.8 can ensure the evacuation. It was suggested that the platform and commercial area should have fire separation, to prevent the smoke spreading to outside.