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对8根持载与恶劣环境作用后的碳纤维增强聚合物(CFRP)加固混凝土梁进行了试验研究.梁的尺寸为1 700mm×120mm×200mm.首先采用4点分加载方式对梁进行预裂,卸载后粘贴CFRP片材,然后放入腐蚀环境.影响因素考虑了干湿交替与持载水平(持载水平分别为30%和60%混凝土梁极限荷载).分析了干湿交替单一因素和荷载与干湿交替双重因素对CFRP加固梁的长期性能.试验结果表明:荷载与干湿交替双重因素对CFRP加固梁的承载力和破坏形态影响较大,这主要是由于CFRP与混凝土界面的劣化引起;对CFRP加固梁的刚度几乎没有影响.
Eight reinforced concrete beams strengthened with carbon fiber reinforced polymer (CFRP) under load and harsh environment were studied.The size of the beam was 1 700mm × 120mm × 200mm.Firstly, the beam was pre-split by 4 points, After unloading, the CFRP sheet was pasted and then put into the corrosive environment.The influencing factors took into account the alternation between dry and wet conditions (the ultimate load of concrete beams with load levels of 30% and 60% respectively) .The single factor of dry-wet alternation and load Long-term performance of CFRP reinforced beams with alternate wetting and drying.Experimental results show that the dual factors of load and wet-dry have a great influence on the bearing capacity and failure morphology of CFRP reinforced beams, which is mainly attributed to the deterioration of CFRP-concrete interface ; Almost no effect on the stiffness of CFRP reinforced beams.