防火挑檐的位置对窗口喷火竖向蔓延的影响

摘要

Fire cornice is one of the measures to prevent the ifre vertical spread through Windows and other opening, the fire cornice width of not less than 0.5m in our fire protection design specification requirements, but has not other required except the ifre cornice width. In this paper, six cases numerical simulation on no-ifre cornice and the top, the middle top, the middle, the middle below, the below located the spandrels by using FDS (Fire Dynamics Simulator) model at first. and then calculated data were analyzed and compared. Finally, the results about the fire cornice location to the impact of the ifre vertical spread.%防火挑檐是阻止室内火灾通过窗户等开口沿着建筑外墙竖向蔓延的措施之一，在我国现行的防火设计规范中对防火挑檐的宽度要求为不小于0.5m，但是并没有针对防火挑檐其它性质作要求。本文分别针对无防火挑檐及防火挑檐位于窗槛墙上方、中上方、中间、中下方、下方六种情况进行FDS模拟，然后分析与比较计算结果，得出防火挑檐位置对于火灾竖向蔓延的影响效果。