摘要
为研究局部火灾下整体钢结构倒塌的初始破坏机理,分别考虑中柱及边柱受火破坏类型,设计了4个平面钢框架结构进行火灾试验研究。试验在立体火灾试验炉内进行,采用恒载升温模式。试验过程中,首层中柱或边柱以及与之相连的钢梁受火,中间层钢柱和梁柱节点采取防火保护措施,受火柱底部与自制测力支座通过螺栓连接。通过试验得到了受火梁、柱的温度场分布和位移反应的变化规律,以及受火中柱的轴力变化过程,对引起整体钢结构倒塌的初始破坏过程和破坏机制进行了分析。
To study the initial collapse mechanism of multi-story steel structures under localized fire, the experimental study on four full-scale steel frame structures was performed. The experi- ments were conducted in a three-dimensional fire test furnace under elevated temperature at con- stant load mode. The first floor column and the steel beams connected with it were subjected to fire during the test, whereas the middle floor column and beam-column joint were fire protected. The bottom of the column under fire was connected with the developed force-measuring bearing using the bolt joint. The temperature distribution and the displacement response of the columns and beams were obtained, and the variation of axial force of the interior column was obtained by using the force-measuring bearing, and the initial collapse mechanisms of structures were ob- tained through the fire experiment.
出处
《防灾减灾工程学报》
CSCD
北大核心
2015年第1期113-118,共6页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(50908006
51278516)资助
关键词
局部火灾
整体钢结构倒塌
破坏机理
试验研究
localized fire
collapse of whole steel structures
failure mechanism
experimental re- search
