墙角火灾环境下钢构件温度分布及响应行为的实验研究
中国科学技术大学火灾科学国家重点实验室,合肥 230027
下一篇 上一篇
摘要
利用ISO9705标准火灾实验系统,模拟墙角火灾环境,以薄壁方管钢梁为研究对象,对钢构件在热、力耦合作用下的行为进行实验研究。对火灾的热释放速率与室内温度场,钢构件及其表面气体的温度、构件在火灾作用下的挠度进行测量,分析真实火灾下钢构件温升及温度分布的特点与火灾发展对构件挠度的影响。研究结果表明钢构件在长向上存在着很大的温差,而构件的挠度变化也并不对称,这说明以往研究中往往假设钢构件在长向上温度一致并不恰当,这种非均匀温度场对构件的行为有着重要影响,它使得构件高温区部分更易发生局部屈服而失效,在相同规模的火灾环境下,与均匀温度场相比,这种墙角火灾所导致的非均匀温度场更不利于钢构件的安全。
关键词
ISO标准火灾实验系统 ; 钢构件 ; 墙角火 ; 温度分布
参考文献
[ 1 ] BS5950 Structural Use of Steelwork in building.Part1:Code of Practice for Design in Simple andContinuous Construction, Hot Rolled Sections[S].London:British Standards Institution, 1990
[ 2 ] Eurocode 3 Design of Steel Structures, Part 1.2:General Rules, Structural Fire Design[S].London:British Standards Institution, 2000
[ 3 ] 李国强, 贺军利, 蒋首超.钢柱的抗火试验与验算[J].建筑结构, 2000, 30 (9) :12~15 链接1
[ 4 ] Sanad A M, Lamont S, Usmani A S, Rotter J M.Structural behaviour in fire compartment underdifferent heating regimes-Part 1: (slab thermalgradients) [J].Fire Safety Journal, 2000, 35 (4) :99~116
[ 5 ] Sanad A M, Lamont S, Usmani A S, Rotter J M.Structural behaviour in fire compartment underdifferent heating regimes-Part 2: (slab meantemperatures) [J], Fire Safety Journal, 2000, 35 (4) :117~130
[ 6 ] 赵金城.高温下钢结构压弯构件的整体稳定性极限状[J].钢结构, 1998, 13 (42) :31~34 链接1
[ 7 ] Usmani A S, Rotter J M, Lamont S, Sanad A M, Gillie M.Fundamental principles of structuralbehaviour under thermal effects[J].Fire SafetyJournal, 2001, 36 (8) :721~744
[ 8 ] Becker R.Effects of heat sinks on evolution oflongitudinal temperature distributions in steel structures[J].Fire Safety Journal, 2002, 37 (1) :1~20
[ 9 ] Becker R.Structural behavior of simple steel structureswith non-uniform longitudinal temperaturedistributions under fire conditions[J], Fire SafetyJournal, 2002, 37 (5) :495~515
[10] ISO-9705 Fire tests Full-scale Room Test for SurfaceProducts[S].Geneva:International StandardsOrganization (ISO) , 1993
[11] 杨昀, 张和平, 刘激扬.室内装饰材料的标准房间/墙角火实验研究进展[J].中国工程科学, 2003, 5 (4) :55~60 链接1
[12] 杨昀, 张和平, 王蔚, 徐亮, 万玉田.典型建筑装饰材料热释放速率全尺寸火灾实验研究[J].火灾科学, 2003, 12 (4) :191~196 链接1
[13] European Committee for Standardisation (CEN) DraftprEN 1991-1-2, Eurocode 1, Basis of Design andActions on Structures, Part 1.2:Actions onStructures-Actions on Structures Exposed to Fire[S].London:British Standards Institution, 2000
[14] Wang Y C.Steel and Composite Structures-Behaviourand Design for Fire Safety[M].London:Spon Press, 2002
[15] Kay T R, Kirby B R, Preston R R.Calculation of theheating rate of an unprotected steel member in astandard fire resistance test[J].Fire Safety Journal, 1996, 26 (4) :327~350