碳纤维布加固火灾后钢筋混凝土梁的试验研究

摘要

Experiment of three full-scale RC (Reinforced Concrete) beams going through high temperature is presented. And experiment of two beams strengthened by CFRP ( carbon fiber reinforced polymer) and one common beam for comparison is test to observe and compare the whole failure process. The results are analyzed. It is found that RC beams strengthened with CFRP can considerably increase the ultimate strength and the stiffness after the steel has yielded and it can limit the further development of the cracks of beams. So,for strengthening RC beams after fire damage with CFRP is an available method.%首先简要介绍了3根足尺的钢筋混凝土梁火灾试验情况,火灾后用碳纤维布加固其中两根梁,然后对加固后的梁和1根未加固的对比梁进行单调加载的静载试验,观测比较梁发生破坏的全过程.通过对静载试验结果进行分析发现,碳纤维布加固能够明显提高火灾后钢筋混凝土梁的极限承载力和钢筋屈服后的刚度,能够较好约束梁裂缝的发展.因此,碳纤维布对于火灾损伤后的钢筋混凝土梁,是一种较为有效的加固方法.