为研究施工中高层建筑外墙保温材料火灾蔓延规律及温度场分布情况,利用火灾动力学模拟软件FDS(Fire Dynamics Simulator),建立了一栋20层钢筋混凝土住宅楼实体的数值分析模型,模型中包括施工脚手架和尼龙安全网,火源点位于第6层的外墙上。分析得到了火灾的发生及蔓延、温度场分布、CO浓度分布规律。研究结果表明,火灾开始时,火焰先沿水平方向发展,然后向上蔓延,并迅速蔓延至整个外表面,即呈表皮着火现象;窗户玻璃爆裂后,室内可燃物被点燃,形成立体燃烧;在建筑凹槽处,产生烟囱效应,燃烧最为剧烈,温度高达1000℃;在整个火灾蔓延过程中,温度出现2个峰值点。研究成果可为高层建筑室外火灾采取防控措施提供参考。 In order to study the law of fire spreading and temperature field distribution of exterior wall insulation material in high-rise buildings during construction, a numerical model of 20-storey reinforced concrete residential building was established by using Fire Dynamics Simulator (FDS). In the model Including construction scaffolding and nylon safety net, fire source is located on the 6th floor of the outer wall. The occurrence and spread of fire, the distribution of temperature field and the distribution of CO concentration were analyzed. The results show that at the beginning of the fire, the flame first develops in the horizontal direction and then spreads upward and spreads rapidly to the entire outer surface, that is, the phenomenon of skin fire. After the window glass burst, the combustible material in the room is ignited to form the three-dimensional combustion. The chimney effect is generated in the groove, the burning is the most intense, the temperature is up to 1000 ℃, and there are two peak points in the temperature during the whole fire spread. The research results can provide a reference for prevention and control measures of outdoor fires in high-rise buildings.