大空间建筑火灾空气升温经验公式

Empirical Formula for Air Temperature in Large Space Structure Under Fire

针对大空间火灾下空气温度场的研究相对匮乏的现状,通过FDS程序模拟火灾场景,对大空间火灾空气升温过程进行研究,并且考虑了烟气排放对温度场的影响.建立了时间相关的温度场数学模型.采用MATLAB程序非线性拟合方法,求出相关参数和拟合效果的评价函数——相关系数的平方(R2).确定空气升温速率系数r和平衡温度θm为反应空间温度场特性的主要参数.数值模拟计算得出的升温曲线与所采用的数学模型的R2达到0.95以上,证明该数学模型形式简单实用,且具有较高的可信度.

As the research on air temperature field in large space structure is relatively scarce, computer simulation was performed by FDS program for fire eases to study the air heating-up process for large-space structure under fire. The effect of smoke emission on fire temperature field is considered. Mathematical model of temperature field related to time has been established. The related parameters and the evaluation function of the fitting results （the square of related coefficient R2） are obtained by a nonlinear curve- fitting method with MATLAB program. The coefficient of temperature rise velocity r and the equilibrium temperature Om are the main parameters related to the characteristics of space temperature field. As the value of R2 for the heating-up curve calculated by numerical simulation and the mathematical model is more than 0.95, the mathematical model is simple, practical and credible.