窗槛墙和防火挑檐对外墙火灾蔓延影响分析

应用FDS建立建筑外墙开口溢流火灾研究数值模型,采用非稳态t2火模型设计6种工况,对比分析窗槛墙和防火挑檐的阻隔性能,结果表明,窗槛墙高度1、1.2 m时温度分布情况和0.8 m时较类似;随防火挑檐宽度增加,阻隔作用更加明显;窗槛墙和防火挑檐使得除着火层外各层辐射强度均较低。通过小尺寸实验研究防火挑檐对竖向火焰的阻隔性能,结果表明,着火层上方温度随防火挑檐宽度增加而变低,但防火挑檐达到一定宽度后着火层上层卷吸增强,致使温度升高。

Analysis on the influence of windowsill wall and fire canopy to exterior wall fire spreading

A numerical model of building exterior wall openings overflow fire was built by FDS.The non-steady-state t2 fire scenario was utilized and 6 simulation conditions were designed.The blocked performances of windowsill wall and fire canopy were compared and analyzed.Results showed that the temperature distribution when the windowsill wall was 1,1.2 m high were similar to that when the height was 0.8 m;the blocked performance was better when the fire canopy was wider.The windowsill wall and the fire canopy can ...