This paper presents the results of fire resistance tests on carbon fiber-reinforced polymer (CFRP) strengthened concrete flexural members, i.e., T-beams and slabs. The strengthened members were protected with fire insulation and tested under the combined effects of thermal and structural loading. The variables considered in the tests include the applied load level, extent of strengthening, and thickness of the fire insulation applied to the beams and slabs. Furthermore, a previously developed numerical model was validated against the data generated from the fire tests; subsequently, it was utilized to undertake a case study. Results from fire tests and numerical studies indicate that owing to the protection provided by the fire insulation, the insulated CFRP-strengthened beams and slabs can withstand four and three hours of standard fire exposure, respectively, under service load conditions. The insulation layer impedes the temperature rise in the member; therefore, the CFRP–concrete composite action remains active for a longer duration and the steel reinforcement temperature remains below 400°C, which in turn enhances the capacity of the beams and slabs.

本文介绍了碳纤维增强聚合物（CFRP）增强的混凝土抗弯构件（即T型梁和平板）的耐火性测试结果。加固的构件采用防火材料进行保护，并在热和结构载荷的共同作用下进行了测试。试验中考虑的变量包括施加的载荷水平，加强程度以及施加到梁和楼板上的隔热材料的厚度。此外，针对火灾测试生成的数据验证了先前开发的数值模型。随后，它被用于进行案例研究。防火测试和数值研究的结果表明，由于防火隔热材料的保护，隔热的CFRP加固梁和楼板可以承受4到3个小时的标准火灾暴露，分别在服务负载条件下。绝缘层阻碍了构件中的温度上升。因此，CFRP-混凝土的复合作用将持续较长的时间，而钢筋温度仍低于400°C，从而提高了梁和板的承载能力。