摘要
目的分析不同高度的前室正压送风口对高层建筑火灾下疏散楼梯间烟气的控制效果,为高层建筑性能化防火设计提供理论支持.方法应用FDS软件对高层建筑三种不同功率的火灾进行模拟,设定五种不同高度的前室送风口对疏散楼梯间进行正压送风,测定疏散楼梯间的CO质量浓度和温度,分析其对烟气的控制效果的影响.结果当火源功率为2.5 MW时,风口中心高度为1 750 mm的风口对烟气的控制效果相对较差,风口中心高度为2 250 mm的风口较好;当火源功率为5 MW和7.5 MW时,风口中心高度为750 mm的风口对烟气的控制效果相对较差,风口中心高度为2 250 mm的风口较好.结论当火源功率在2.5～7.5 MW波动时,正压送风口设置在2 m高度以上,可以很好地实现对高层建筑疏散楼梯间烟气蔓延的控制,是人员安全疏散的重要保障.
This paper aims to analyze the effect of controlling high-rise building fire smoke when the evacuation stairwell anteroom is under the positive pressure air supply system with the different heights of outlet in order to provide the theoretical support to the high-rise buildings performance fire design.Based on Fire Dynamics Simulator software,three different fire powers in the high-rise building are set together with five different installation heights of outlets in the evacuation stair room to supply the positive pressure air.The smoke parameters in the evacuation stair room are measured and analyzed,such as CO concentration,temperature,visibility degree and so on.The simulation results illustrate that when the fire power is 2.5 MW,the outlet with the height of 1 750 mm is relatively the worst effective in smoke controlling,while the one of 2 250 mm is the best;when the fire power is 5 MW and 7.5 MW,the outlet with the height of 750 mm is the worst in controlling smoke while the one of 2 250 mm is the best again.The study indicates that when the fire powers in between 2.5-7.5 MW and the positive pressure air supply outlets is higher than 2 000 mm,the controlling of the smoke which spreading in high-rise building evacuation stairwell can be achieved,as well as an the important guarantee for the safety of the evacuation.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2011年第6期1146-1150,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51174046)
关键词
高层建筑火灾
疏散楼梯间
风口高度
烟气控制
high-rise building fire
evacuation stairwell
height of outlet
smoke controlling
作者简介
张培红（1969-），女，教授，博士，主要从事建筑火灾安全科学研究．
