某钢铁厂主厂房钢结构火灾危险性研究
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摘要
通过在某钢铁厂主厂房内开展火灾实验,监测厂房内油池火的火焰发展高度、羽流中心线温度衰减规律、顶棚温度分布情况,观测记录烟气流扩散蔓延过程,获取实时数据,得知顶棚钢结构受火灾烟气温度影响情况。结果表明:钢铁厂主厂房发生4 MW火灾时,稳定阶段火焰高度维持在4～5 m,羽流中心线的温度随高度增加而大幅度衰减,火源上方顶棚钢结构附近的温度仅维持在50℃以内,顶棚钢结构的安全性得以保证。
Flame height of hydraulic fluid, rules of temperature attenuation in the plume centerline, and temperature distribution around steel roof structure is tested and features of fire smoke spread is monitored by fire entity experiment in a workshop of a steel factory. Real-time data are obtained, concluding the degree of influence of fire temperature on steel roof structure. Results show that once a moderate scale fire(4 MW) happens in a workshop of a steel factory, flame height in steady state maintains from4 m to 5 m. And temperature in the plume centerline decreases greatly with the increasing height. In addition, the temperature near the steel roof structure above the fire is only below 50 ℃ so that the safety of steel roof structure is guaranteed.
Flame height of hydraulic fluid, rules of temperature attenuation in the plume centerline, and temperature distribution around steel roof structure is tested and features of fire smoke spread is monitored by fire entity experiment in a workshop of a steel factory. Real-time data are obtained, concluding the degree of influence of fire temperature on steel roof structure. Results show that once a moderate scale fire(4 MW) happens in a workshop of a steel factory, flame height in steady state maintains from4 m to 5 m. And temperature in the plume centerline decreases greatly with the increasing height. In addition, the temperature near the steel roof structure above the fire is only below 50 ℃ so that the safety of steel roof structure is guaranteed.
引文
[1]王广勇,张东明.大跨钢结构抗火设计方法[J].消防科学与技术,2017,36(9):1236-1238.
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[3]张峰,史健勇,于文静.福州南站房屋面钢结构性能化防火评估与设计[J].土木工程学报,2009,26(12):102-105.
[4]史健勇,孙旋,刘文利,等.基于整体的大空间钢结构性能化防火设计方法研究[J].土木工程学报,2011,(5):69-78.
[2]史健勇,赵金城.复杂空间钢结构整体性防火分析的系统方法研究[J].土木工程学报,2008,41(11):51-62.
[3]张峰,史健勇,于文静.福州南站房屋面钢结构性能化防火评估与设计[J].土木工程学报,2009,26(12):102-105.
[4]史健勇,孙旋,刘文利,等.基于整体的大空间钢结构性能化防火设计方法研究[J].土木工程学报,2011,(5):69-78.