以某商业综合体为例,使用FDS进行三维数值模拟,研究商业综合体内部发生火灾时烟气运动规律.模拟中庭发生火灾的两个火灾场景,考察首层步行街作为人员疏散准安全区的可行性.结果表明:步行街满足准安全区的要求；人员可用安全疏散时间主要受能见度影响；火灾不会通过热辐射的方式蔓延；机械排烟失效造成的危害比自动灭火失效严重.建议加强管理,室内步行街回廊设置排烟系统.%FDS was used to simulate the smoke movement of fire with the example of a commercial complex. Two scenarios were simulated with fire at atrium to evaluate the feasibility of walking street at first floor as quasi-safety zone. The result showed that: the walking street can fit the requirement of quasi-safety zone; the ASET affected mainly by visibility; the fire can not spread by heat radiation; the failure of mechanical exhaust system make more damage than the failure of auto-sprinkler system. Suggestions like enhance the management and set exhaust system at corridor of walking street were put forward.
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