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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

25卷

期数:

2008年03期

页码:

54-60

栏目:

出版日期:

2008-09-20

文章信息/Info

Title:

Practical Calculation Method for Temperature Elevation of Steel Members on Flame Radiation in Large Space Building Fire

作者:

杜咏¹,李国强²

1.南京工业大学建筑与城市规划学院,江苏南京210009;2.同济大学土木工程学院,上海200092

Author(s):

DU Yong¹, LI Guo-qiang²

1. School of Architecture and Urban Planning, Nanjing University of Technology, Nanjing 210009, Jiangsu, China; 2. School of Civil Engineering, Tongji University, Shanghai 200092, China

关键词:

大空间建筑火灾;  火焰辐射;  钢构件升温;  钢结构抗火设计

Keywords:

large space building fire;  flame radiation;  temperature elevation of steel member;  fire-resistance design of steel structure

分类号:

TU972

DOI:

-

文献标志码:

A

摘要:

对基于集总热容法建立的钢构件热平衡方程进行了参数分析,发现在火焰辐射下对钢构件升温有影响的参数有:大空间建筑火灾中烟气的升温历程和烟气最高升温、火焰面与其正上方钢构件表面微元间的角系数、受火焰辐射钢构件有效表面积系数以及钢构件的形状系数。建立了包含这些影响参数的火焰辐射下钢构件升温典型曲线的数学表达式,通过对精确结果进行拟合,得出了火焰辐射下钢构件升温计算式的待定系数,从而得出大空间建筑火灾中火焰辐射下钢构件升温的实用计算式,该实用计算式避免了直接利用钢构件热平衡方程计算火焰辐射下钢构件升温的繁琐,同时与精确计算的结果吻合程度较好,便于工程技术人员在大空间建筑钢结构抗火设计中应用。

Abstract:

Based on parameter analysis on the heat equilibrium equation of lumped differential formulation, the parameters for influencing the temperature elevation of steel members under flame radiation were gained as follows: the time history of temperature of steel members, the temperature of smoke in large space building fire, the configuration factor for heat radiation from flame to steel members, the effective surface area coefficient of steel members for flame radiation and the shape and size of steel member. A direct expression involving the above factors for calculating temperature of steel members caused by flame radiation in large space building fire was proposed by cure-fitting strategy on the base of exact solution to the heat equilibrium equation for the temperature and the undetermined constants of the expression were determined. This expression is simple and can be conveniently used for fire-resistance design of steel structures for large space buildings.

参考文献/References:

[1] 李国强,杜 咏.大空间建筑顶部火灾空气升温的参数分析[J].消防科学与技术,2005,24(1):19-21. LI Guo-qiang,DU Yong.Analyses the Parameters of Fire Temperature Elevation at the Top of Large Space Buildings[J].Fire Science and Technology,2005,24(1):19-21.
[2]杜 咏,李国强.基于场模型的大空间建筑火灾钢构件升温的简化计算方法[J].消防科学与技术,2006,25(3):299-303. DU Yong,LI Guo-qiang.Simplified Algorithm of Steel Members at Elevated Temperature in Large Space Fire Based on Field Model[J].Fire Science and Technol-ogy,2006,25(3):299-303.
[3]CECS 200:2006,建筑钢结构防火技术规范[S]. CECS 200:2006,Technical Code for Fire Safety of Steel Structures in Buildings[S].
[4]杜 咏,李国强.大空间建筑火灾中火焰辐射对无保护钢构件升温的影响[J].火灾科学,2006,15(4):189-199. DU Yong,LI Guo-qiang.Fire Radiation Effect on Steel Member at Elevated Temperature in Large Space Fire[J].Fire Safety Science,2006,15(4):189-199.
[5]李国强,杜 咏.实用大空间建筑火灾空气升温经验公式[J].消防科学与技术,2005,24(3):283-287. LI Guo-qiang,DU Yong.Utility Temperature Elevation Empirical Formula in Large Space Fire[J].Fire Science and Technology,2005,24(3):283-287.

相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2008-04-03
基金项目:国家科技部资助项目(2005BA908B12)
作者简介:杜 咏(1967-),女,重庆市人,副教授,工学博士,E-mail:yongdu_mail@126.com。

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更新日期/Last Update: 2008-09-20