摘要
钢结构建筑之所以被建筑行业广泛使用,是因为其具备抗震能力强、保护环境和施工工期较短等优点,但其劣势也非常明显——抗火能力差。迄今为止,国内外对其抗火性能的探讨,大多集中于单个钢构件或是组合形式的抗火性能研究。在进行钢结构抗火性能分析时,很多节点都被理想化为刚性节点或铰节点,这与钢框架节点的实际受力状态是不同的,实际钢框架节点应介于刚性节点与铰节点之间。本文基于数值分析方法,分别建立了梁柱刚性和半刚性连接的2个钢框架模型,在火灾条件下,对这2种模型下的应力和温度的变化情况进行了热-力耦合分析。研究表明,刚接钢框架抗火承载能力高于半刚接钢框架,半刚接钢框架变形大于刚接钢框架,研究成果可为钢结构框架抗火设计和分析提供参考。
A great many industrial buildings use steel structural materials, because they have the advantages of the anti-knock capacity, environmental conservation and relatively short time limit, but its poor resistance to fire is an obvious drawback. At present, the research on fire resistance of steel frame under fire is mainly focused on the fire resistance of singlesteel members or some special structural form of beam column joints.In the study of integral fire resistance of space steel structures, the ideal rigid contact or hinge point is the destination of most beam-column joints, and this is along a bend different from the actual bend of a steel bending beam. Based on the theoretical and the methods of numerical analysis, the author establishes two steel frame models of beam column rigidity and semi-rigid connection respectively. Stress and temperature are analyzed under fire of two spatial steel frame models. The study reveals semi-rigid steel frame’s capacity of fire resistance capacity is inferior to that of rigid steel frame, and rigid steel frame’s deformation is less than that of semi-rigid steel frame. The research results can be applied to the fire resistance design and analysis of steel frame.
作者
张建中
方亚男
孙强
ZHANG Jianzhong;FANG Yanan;SUN Qiang(School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China)
出处
《四川建筑科学研究》
2022年第1期25-31,共7页
Sichuan Building Science
基金
国家重点基础研究发展计划项目子课题(2012CB719703)。
关键词
钢框架
整体性能
火灾
半刚接
刚接
耦合分析
steel frame
whole performance
fire disaster
semi-rigid joint
rigid joint
coupling analysis
