初始损伤对CFRP加固混凝土梁受弯性能的影响

Effect of initial damage on uhe flexural performance of reinforced concrete beams strentthed of cfrp sheets

通过9根碳纤维布加固的具有初始损伤钢筋混凝土梁、6根碳纤维布直接加固钢筋混凝土梁及3根对比钢筋混凝土梁的抗弯性能试验,分析了初始荷载、初始裂缝及加载历史等对加固梁裂缝发展、屈服荷载、刚度、极限荷载的影响。试验结果表明,采用碳纤维布加固钢筋混凝土梁可以有效的提高其抗弯性能。初始荷载、初始裂缝及加载历史等对加固梁的裂缝发展、刚度、屈服荷载和极限荷载均有不同程度的影响。

Nine initially damaged reinforced concrete beams with epoxy-bonded carbon fiberglass reinforced plastic （CFRP）sheets, six RC beams strengthening with CFRP directly and three RC beams were experimentally investigated. The failure mechanism of RC beams of different initial load and load history strengthened with extemally bonded CFRP sheets is analyzed. The effect of load history and initial damage on development of crack, stiffness and flexural capacity is studied. The results generally indicate that the flexural performance of the repaired beams is increased. And load history and initial damage affect the development of crack, stiffness and flexural capacity of the beams.