大空间结构各种火灾场景下的温度场分布  

Temperature field distribution of large-space structures under various fire scenarios

作　　者：白音[1] 杨海勇[2] 石永久[3] 王元清[3] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191 [2]清华大学基建规划处,北京100084 [3]清华大学土木工程系,土木工程安全与耐久教育部重点试验室,北京100084

出　　处：《清华大学学报（自然科学版）》2011年第8期1122-1127,共6页Journal of Tsinghua University(Science and Technology)

基　　金：高等学校博士学科点专项科研基金资助项目(20091102120034)

摘　　要：大空间建筑近年来在中国得到了迅速的发展,其防火设计研究工作也日趋受到人们重视。利用流体动力学计算软件FLUENT对大空间建筑中的不同火灾场景进行了数值模拟,着重分析了单个火源位于底面不同位置处以及2个火源同时存在时模型壁面温度场的分布。此外,由于防烟分区和排烟系统等的设置对大空间建筑火灾下的温度分布有较大影响,还对在考虑防排烟装置情况下的结构温度场变化进行了计算与对比。研究结果表明:当火源距离空间壁面较近时,温度沿高度方向梯度很大,沿高度方向不能近似为等温处理;在2个火源同时存在的情况下,不宜将各火源功率直接相加后用单个火源计算结果作为实际温度场的分布,应考虑各火源的相对功率和相对位置的影响。Large-space constructions have been rapidly developing in China with the corresponding fire-resisting design and research attracting more and more attention. A CFD soft package, FLUENT, was used to numerically simulate large-space constructions under different types of fire scenarios. The temperature distributions on wall surfaces were analyzed with single fire resource located at various positions and with two fire sources existing at the same time. The smok^resisting sub areas and devices may remarkably affect this kind of construction under fire conditions, so the temperature variation was also studied in consideration of smoke-resisting design, The results show that when the fire source is near to the wall surface, the temperature gradient along the height direction is large, so the surface can not be considered as isothermal, and that when two fire sources exist at the same time, the temperatures can not be regarded as the single fire resource results obtained simply by means of summing up the two fire heat released rates, and the influence of relative heat released rates and positions of the two fires should be taken into account.

关 键 词：大空间建筑 温度场 火灾场景 防烟装置 

分 类 号：TU111.3[建筑科学—建筑理论]