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随着CFRP在混凝土结构加固中的广泛应用,其防火问题引起关注。但是目前关于高温下CFRP加固构件的防火性能研究成果相对较少。以当前国内外相关研究成果为基础,用有限元程序对加固构件进行高温下的传热分析和力学分析,运用有限元程序在计算机上再现了防火试验的全过程。研究荷载比、CFRP加固量、防火材料厚度以及混凝土保护层厚度等因素对采用硅酸钙防火板保护的CFRP加固梁耐火极限的影响规律,并得到了不同工况下的CFRP加固钢筋混凝土梁的耐火极限,为CFRP加固混凝土梁的防火设计提供了依据。
With the widespread use of CFRP in the reinforcement of concrete structures, its fire safety concerns. However, there is relatively little research on the fire performance of CFRP reinforced members at high temperature. Based on the current research results at home and abroad, the finite element program is used to analyze the heat transfer and mechanical analysis of reinforced components under high temperature. The whole process of fire test is reproduced by computer using finite element program. The influences of load ratio, CFRP strength, thickness of fireproof material and thickness of concrete cover on the fire resistance of CFRP reinforced beams protected by calcium silicate fireproof board were studied. The CFRP reinforced concrete beams under different working conditions The fire resistance limits provide the basis for fire protection design of CFRP reinforced concrete beams.