【作者】 肖德后； 徐明； 陈忠范； 胡孔国；

【Author】 Xiao Dehou~1,Xu Ming~2,Chen Zhongfan~2,Hu Kongguo~1 (1.China Electronics Engineering Design Institute Beijing 100840; 2.Key Lab of RC & PC Structures of Ministry of Education,Southeast University Nanjing 210096)

【机构】 中国电子工程设计院； 东南大学混凝土及预应力混凝土结构教育部重点实验室；

【摘要】 通过对两根采用不同粘结剂的碳纤维加固钢筋混凝土柱和一根未加固的钢筋混凝土柱进行火灾试验,对比了各柱的破坏形态、截面温度场、轴向变形以及耐火极限。结果表明:(1)有机胶粘贴碳纤维布所形成的约束在受火几分钟后就会失去约束效果,而无机胶粘贴碳纤维布所形成的约束在受火几十分钟后仍然可以为核芯混凝土提供良好的侧压力;(2)受火时间相同时,碳纤维加固混凝土柱的截面温度场要比未加固柱偏小,无机胶粘贴碳纤维布加固的混凝土柱与有机胶粘贴碳纤维布加固的混凝土柱两者温度场总体相差不大;(3)无机胶粘贴碳纤维布加固的混凝土柱耐火性能较好,其耐火极限较之有机胶粘贴碳纤维布加固的混凝土柱提高了53.3%,且与相同荷载比条件下的未加固柱的耐火极限相当。采用合适的无机胶来粘贴碳纤维布是改善碳纤维加固混凝土结构耐火性能的一种好方法。更多还原

【Abstract】 By conducting fire tests on an unstrengthened RC column and two reinforced concrete(RC) columns strengthened with carbon fire reinforced polymer(CFRP) sheets bonded with different types of adhesive,the failure mode,temperature field,axial deformation and fire endurance of the columns are analyzed.The results indicate that:(1) the CFRP sheets bonded with organic adhesive will lose confinement effect when exposed to fire for several minutes,but the CFRP sheets bonded with inorganic adhesive can well give lateral pressure to internal concrete when exposed to fire for several tens of minutes;(2) when the fire duration of the specimens is equal,the cross section temperature field of RC columns strengthened with CFRP sheets is lower than that of unstrengthened RC column,and the cross section temperature field of RC columns strengthened with CFRP sheets bonded with organic or inorganic adhesive have not big discrepancy;(3) the RC column strengthened with CFRP sheets bonded with inorganic adhesive can obtain a fairly good fire endurance,which is 53.3%longer than the fire endurance of RC column strengthened with CFRP sheets bonded with organic adhesive,and almost equal to the fire endurance of unstrengthened RC column.It’s a good way to use proper inorganic adhesive in order to improve the fire resistance of RC structures strengthened with CFRP sheets.更多还原