高层建筑火灾烟气竖直方向传播规律及分布研究

Transport and distribution characteristics of the fire smoke in vertical direction in high-rise building

为了解高层建筑物内火灾烟气在垂直方向的运动规律,使用FDS4.0测定了典型高层建筑物在防火门的开启状态下各层楼梯间及走廊中火灾烟气的温度和CO,O2等气体的浓度变化情况。模拟结果表明:中和面以上各层危险性随高度增加而增加,中和面以下各层则以靠近火灾层而危险性增加,中和面附近各层危险到来时间相对滞后,同时随着火灾的发展,中和面有下降的趋势。

To study the fire smoke flow pattern in vertical direction in high - rise building, the changing regulation of temperature and chemical components＇ concentration （e. g. CO,O2） of smoke in staircase and shaft with all fire door open were determined by FDS4. 0. The results showed that： above the neutral plane, the danger of each floor was increased as the height increased, and below the neutral plane, the danger of each floor was increased for near the fire floor. With the development of fire, neutral plane had downward trends.