【摘要】 比较分析了火灾试验后6根混凝土梁在用碳纤维布(CFRP)加固前后的极限荷载、变形、裂缝、延性系数等指标.试验研究表明:混凝土梁在遭受火灾作用后,由于材料性能的衰退而导致梁的承载力降低;使用碳纤维布提高火灾后混凝土梁的承载力的方法,能有效地抵抗2次火灾的影响;基于试验结果,推导出火灾后碳纤维布加固的实用设计方法,与试验数据可以较好地吻合,且偏于安全,能满足实际工程应用的要求.更多还原

【Abstract】 Ultimate strength, deformation, crack and ductility capacity of six reinforced concrete beams before and after strengthening the beams after fire are compared and analyzed. Experiment results show that the decline in material performance contributes to sharp reduction of bearing capacity of the beams after fire. CFRP could evidently increase the ultimate strength of the reinforced concrete beams. The strengthened structure has effective resistance to the subsequent fire. Based on the experiment results, a practical design method is proposed, which has good agreement with the experiment results and trends to be safe.更多还原