建筑结构学报Jour nal of Bu ildi ng Structures第31卷第6期2010年6月

V ol131No16J une2010013文章编号:1000-6869(2010)06-0096-14

钢-混凝土组合结构抗火性能研究与应用

余志武,丁发兴

(中南大学土木建筑学院,湖南长沙410075)

摘要:钢-混凝土组合结构抗火性能研究是当前的研究热点之一,国内外学者对此展开大量试验研究和理论分析。通过介绍国内外研究者在组合板、组合梁、组合柱等构件以及结构节点和结构体系抗火性能方面研究概况,分析了我国现有防火设计规范的特点以及工程应用情况,指出现有研究的不足,对组合结构抗火研究领域在高温材料热-力耦合本构关系、计算理论、数值火灾试验和设计方法等方面需进一步研究的工作进行了展望。文中指出,建立考虑升降温、多轴应力状态、不同加卸载路径的钢材和混凝土热-力耦合本构关系,建立基于整体性能、考虑升降温全过程的结构抗火分析理论,建立整体结构数值火灾试验方法,提出/三水准0结构抗火设计与灾后结构损伤评估原则以及基于时变可靠度和结构整体性能的组合结构抗火设计方法是钢-混凝土组合结构抗火性能研究的关键科学问题。

关键词:组合结构;抗火性能;耐火极限;抗火设计;火灾全过程

中图分类号:TU398文献标志码:A

Fire perfor mance research and applicati on on

stee-l concrete co mposite structures

YU Zhi w u,DING Faxing

…… 此处隐藏0字 ……

(School of C i vil Engi neering and Arch itecture,Central South Un i versity,Changsha410075,Chi na)

Abstract:F ire perfor m a nce of stee-l concrete c o m posite str uctures has bee n a focal poi nt of researc h for recent years. M any experm i ental tests and theoretical analysis have been carried out by researchers a ll over the world.This paper summarizes the recent achieve m e nts m ade i n fire perfor mance of co m posite slabs,co m posite bea m s,co mposite colu mns,bea m-colu mn connect i ons,fra m es and str uctur a l syste m.The features o f the code for f ire pr otecti on design and the pr actical appli cat i on are also ana l yzed.T he prm i e proble ms ex i st i ng i n the fiel d o f fire perfor m ance are po i nted out in this paper.The issues related to the fire perfor mance of co mposite str uctures,such as materi a l ther ma-l stress coupled constituti vem ode,l analytical t heor y,numerical fire testi ng,and f i re perfor m ance desi gn method which require f urther research are d i scussed.F i ve key proble m s concer ning w ith fire perfor m a nce of stee-l concrete co mposite str uctures are ident ified:(1)The ther ma-l stress coupled constituti ve models o f steel and c oncrete,wh ic h consi der the factors such as heat i ng and post-fire coo li ng,mult-i ax i a l stress states,and different routes o f load and unload,shou l d be pr oposed;(2)T he analytical methods for fire perfor m ance of co m posite str uctures consi deri ng heating and post-fire coo ling should be established based on g lobal str uctural behavior;(3)The nu m erical fire testing method for the global str uctural should be established;(4)The-three level.fire perf or m ance desi gn for str uctures and pri nci ples of da mage assess m ent for str uctures after fire should be established;(5)T he desi gn m et hods for co m posite structures should be proposed base d on t m i e-dependent reli ab ility and g lobal structural behavior.

keywords:co mposite struct ure;fire perfor m a nce;f ire resi sta nce;f i re-resista nce desi gn;f ul-l range fire

基金资助:国家自然科学基金项目(50808180),教育部博士点基金项目(200805331064),湖南省自然科学基金项目(07JJ4014)。

作者简介:余志武(1955)),男,湖南临湘人,工学硕士,教授。E-ma i:l zh w yu@m ail1csu1edu1cn

通讯作者:丁发兴(1979)),男,浙江瑞安人,工学博士,副教授。E-m a i:l d i n f ax i n@m ail1cs u1edu1cn

收稿日期:2010年3月

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