摘要
编制了碳纤维布抗弯加固钢筋混凝土梁的温度场计算程序和耐火极限分析程序,通过数值分析结果与试验结果的对比,初步验证了程序的有效性。利用上述程序,针对高温下加固梁的受弯破坏形态,就不同构件跨高比、防火涂料厚度、受拉纵筋配筋率、碳纤维布加固量、混凝土保护层厚度、荷载比等共计1728种工况进行了大量计算分析,同时考察了各参数对加固梁耐火极限的影响规律。在此基础上,建立了加固梁的耐火极限简化预测方法。研究结果表明,加固梁的耐火极限随防火涂料厚度、混凝土保护层厚度和受拉纵筋配筋率的增加而逐渐增大,同时随荷载比、碳纤维布加固量和跨高比的增加而逐渐减小,其中荷载比的影响最为显著。
A computer program for fire performance analysis of RC beams strengthened in flexure with carbon fiber sheets is developed, and the program is verified by comparing the numerical results with the test data. Considering the flexural failure mode of the strengthened RC beams in fire, the influence of some parameters （i.e., span-depth ratio, thickness of fire insulation, reinforcement ratio, strengthening ratio, thickness of concrete cover, and load ratio） on fire endurance of the strengthened RC beams is analyzed extensively. Based on the simulation results, a simplified formula is proposed to determine the fire endurance of RC beams strengthened in flexure with carbon fiber sheets. It can be found that the fire endurance of the strengthened RC beams increases with an increasing of the thicknesses of fire insulation, the thicknesses of concrete cover and the reinforcement ratio; and decreases with an increasing of the strengthening ratio, the span-depth ratio and the load ratio. The effect of the load ratio on the fire endurance of the strengthened RC beams is significant.
出处
《工程抗震与加固改造》
2008年第2期101-108,共8页
Earthquake Resistant Engineering and Retrofitting
基金
教育部新世纪优秀人才支持计划(NCET-04-0819)
教育部博士学科点专项科研基金(20060561014)
关键词
碳纤维布
抗弯加固
钢筋混凝土
梁
耐火极限
carbon fiber sheet
strengthened in flexure
reinforced concrete
beam
fire endurance
