摘要
应用有限元方法,分析了火灾作用下钢管混凝土柱截面温度变化与脱黏之间的关系。研究表明,火灾作用下钢管混凝土柱易发生脱黏,脱黏主要取决于防火涂层厚度和火灾作用时间;防火涂层厚度对初始脱黏空隙厚度的影响较大,对于常用钢管混凝土柱,无防火涂层时初始脱黏空隙厚度在0.33～2.04 mm之间,防火涂层厚度为10 mm时初始脱黏空隙厚度在0.87～9.24 mm之间;脱黏使得钢管表面的温度升高,核心混凝土的温度降低,相比之下,有防火涂层时截面温度变化受脱黏的影响更大;脱黏空隙厚度随火灾作用时间的增大而增大,并且管径越大,空隙的变化幅度越大;脱黏空隙厚度同时也受防火涂层厚度影响,有防火涂层的试件最终脱黏空隙厚度比无防火涂层试件有所减小。
By using the finite element method, the relationship between temperature variation and debonding of CFST section was analyzed. The analysis result shows that debonding may easily happen in CFST columns when exposed to fire. Whether Debonding or not depends on the thickness of anti-fire layer, section dimension and fire duration. The thickness of anti-fire layer has great influence on the initial debonding gap width. For the usually used CFST column without anti-fire layer, the gap width is 0.33 mm to 2.04 mm. For the CFST column with anti-fire layer, the gap width is 0.87 mm to 9.24 mm. The temperature of steel tube is higher and the temperature of concrete is lower in the debonded CFST sections than that in bonded ones. Compared with the case of no anti-fire layer, debonding has much influence on the temperature change of CFST column with anti-fire layer. The debonding gap width increase along with the increase of fire lasting time. The bigger the diameter is, the wider the gap is. The debonding gap width is also influenced by the anti-fire layer. The final debonding gap width of the specimen with anti-fire layer is less than that of the specimen without anti-fire layer.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第9期104-111,共8页
Journal of Building Structures
基金
福建省自然科学基金项目(2011J05134)
华侨大学科研启动项目(10BS318)
华侨大学"中央高校基本科研业务费"项目(JB-ZR1228)
关键词
钢管混凝土
温度场
脱黏
有限元分析
火灾反应
concrete filled steel tube
thermal field
debonding
finite element analysis
fire reaction
