反向加载条件下CFRP加固混凝土梁裂缝演化的试验研究

通过对4根存在较大宽度裂缝的混凝土梁在反向加载条件下的碳纤维(CFRP)加固试验，分析了在反向加载条件下碳纤维加固梁的力学性能及裂缝的开展规律，表明采用该方法在第二次加载过程中混凝土梁的最大裂缝的宽度也可以得到有效的控制，可以减小裂缝宽度20％～50％．试验结果及理论分析表明该加固方法对减小混凝土梁的裂缝宽度、改善梁的应力分布有显著效果．

Experimental investigation of crack evolution in CFRP reinforced concrete beams loaded inversely

By means of experiment on reinforcement with carbon fiber (CFRP) for four concrete beams with wider cracks and inverse loads,the mechanical properties of these beams and the patterns of crack propagation are analyzed.It is shown that,by using this reinforcement method,the width of the widest crack in concrete beams can be contracted effectively as well in the process of secondary loading,and its width can be reduced 20%~50%.The experimental results and theoretical analysis show that the crack width in concrete beams can be reduced and the stress distribution in the beams improved with remarkable effect.