摘要
顺应当前装配式建筑和绿色低碳建筑的发展,越来越多的钢-木组合结构建筑建成落地。工程和学术界对钢-木组合结构的研究也越来越多,但涉及抗火性能的研究不多。由于抗火性能是制约钢-木组合结构应用的一个重要问题,而受火升温特性对其抗火性能有重要影响,本文采用有限元方法建立钢-木组合结构构件的数值分析模型,分析其受火后温度场分布及升温特性,并与既有试验结果比较,验证分析模型的有效性。进而采用经试验验证的有限元数值分析模型进行参数分析,比较不同木材密度、含水率、包裹木材厚度对钢-木组合构件中钢骨升温的影响,结果表明:当钢骨温度超过100℃后,木材密度越小、含水率越高,钢骨升温越快;而当包裹木材厚度较大时,在一定受火时间内,钢骨温度基本没有变化。最后将受火钢-木组合构件中钢骨的升温曲线与纯钢构件比较,发现钢骨升温速率表现为先慢后快,与纯钢构件相反,对结构抗火更有利。
Follow the development of prefabricated buildings and green low carbon buildings,more and more timber-steel composite buildings have been built.there are,too,more and more researches on timber-teel composite structures in the engineering and academic circles,while the researches are seldom involved in fire resistance.The fire resistance is an important problem that restricts the application of timber-steel composite structures,and temperature elevation characteristics under fire have an important impact on fire resistance of timber-steel composite structures.In this paper,the finite element method is used to establish the numerical analysis model of timber-steel composite members,and analyze the temperature field distribution and temperature elevation characteristics under fire,and the analysis results are compared with existing tests to verify the validity of the model.Then,the finite element numerical analysis model verified by the test is used for parameter analysis to compare the effects of different wood density,moisture content,and wrapped wood thickness on the temperature elevation of steel bones in timber-steel composite members,the results show that:when the temperature of steel bone exceeds 100℃,the lower the wood density and the higher the water content,the faster the temperature of steel bone rises;when the thickness of wrapped wood is large,the temperature of steel bone basically does not change within a certain time under fire.Finally,comparing the temperature rise curve of the steel bone in the timber-steel composite structure under fire with that of the pure steel structure,it is found that the temperature rise rate of the steel bone is slow first and then fast,which is opposite to that of the pure steel structure,and is more favorable for structural fire resistance.
作者
高路巧
李国强
GAO Luqiao;LI Guoqiang(College of Civil Engineering,Tongji University,Shanghai 200092,China;Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构》
北大核心
2023年第S01期1964-1969,共6页
Building Structure
关键词
钢-木组合
数值分析
受火
升温
参数分析
timer-steel composite
numerical analysis
under fire
temperature elevation
parameter analysis
作者简介
第一作者:高路巧,硕士,工程师,一级注册结构工程师,主要从事建筑结构分析和设计,Email:909454272@qq.com。
