中文摘要：

基于碳纤维加固材料（CFRP）布加固疲劳损伤后的钢筋混凝土梁和预应力混凝土梁进行的竖向荷载作用下试验,研究了CFRP布加固疲劳损伤后的混凝土梁受弯性能和抗弯承载力。试验结果表明：预应力钢筋明显减小加固梁的跨中挠度及CFRP布应变值;混凝土梁的疲劳损伤降低了CFRP布加固钢筋混凝土梁的极限抗弯承载力,且混凝土梁加固前损伤程度越大,加固后极限抗弯承载力降低的幅度亦越大;采用GB50367—2013《混凝土结构加固设计规范》和GB 50608—2010《纤维增强复合材料建设工程应用技术规范》中提出的抗弯承载力计算式（均未考虑梁加固前损伤程度）,所得计算值均高于试验结果,表明加固前梁产生的疲劳损伤对加固后抗弯承载力的影响不可忽略。

英文摘要：

The fatigue damaged RC beams and prestressed RC beams strengthened with CFRP sheets were tested under vertical loads to study the flexural property and flexural capacity of the fatigue damaged specimens. The test results showed that the span deflection and the CFRP sheets strain of the prestressed beam were obviously decreased before yielding of the steel bar. While the flexural capacity of the CFRP sheets reinforced RC beam decreased by the fatigue damaged to the beam, and the bigger of the damage degree of the beam, the lower of the flexural capacity of the CFRP sheets reinforced RC beam. The calculation results calculated by the bending bearing capacity theory formula in the Design Code for Concrete Structure Reinforcement （GB 50367--2013 ） and Technical Code for Infrastructure Application of FRP Composites （GB 50608--2010） were higher than those of the test results, which illustrated that the fatigue damage of the beam before its reinforement should be considered in calculating the flexural capacity of the CFRP sheets reinforced RC beam.