经历火灾后,钢筋混凝土梁的承重能力和硬度都会降低,使用碳纤维增强聚合物板(CFRP)对其进行加固是一种新的加固方法。研究比较了6根钢筋混凝土梁在火灾前后的最终强度、变形、开裂和延展性。试验结果显示,材料性能的降低对火灾后梁的承载力影响巨大。探讨了如何提高钢筋混凝土梁的延展性和承载力。在采取了适当耐火保护方法后,加固结构具有了较强的抗火能力。在试验结果基础上,提出了用CFRP板对火灾后钢筋混凝土梁进行加固的方法。这种加固方法与试验结果相当吻合并具有很高的安全性。 After a fire, the load-bearing capacity and hardness of reinforced concrete beams will be reduced. Reinforcing them with CFRP is a new reinforcement method. The final strength, deformation, cracking and ductility of six reinforced concrete beams before and after fire were studied and compared. The test results show that the reduction of material properties has a great influence on the bearing capacity of the beam after a fire. Discussed how to improve the ductility and bearing capacity of reinforced concrete beams. After a proper fire protection method is adopted, the reinforced structure has a strong fire resistance. Based on the test results, a method for reinforcing reinforced concrete beams after fire with CFRP plates was proposed. This method of reinforcement is very consistent with the test results and has a high degree of safety.