界面处理对恶劣环境下CFRP-加固混凝土梁性能研究

The Study on Interface with CFRP-Reinforced Concrete Beams under Bad Environment

以钢筋混凝土梁强度等级、界面处理方式、侵蚀环境为参数,利用6组实验梁进行三点弯曲试验来研究恶劣环境下界面处理对粘结性能的影响。实验结果表明:凿毛梁的抗弯承载力较砂轮打磨梁的承载力大,经过环境劣化后的混凝土梁,极限弯矩都有大幅折减,C50较C30减小幅度小12%,以C50钢筋混凝土梁为例,在氯盐环境中浸泡7d、14d、21d、28d,极限抗弯分别降低4%、6%、7.5%、12%。凿毛后的CFRP加固梁,虽然粘结性能增强,但是由于CFRP受拉过程中会产生应力集中,导致CFRP过早被拉断,工程中建议增加黏结面粗糙度,以提高梁的极限弯矩。

It is used six groups of experimental beams under the three point bending test to study bonding interface under the bad environment, so as to the parameters of beam strength grade, interface treatment, erosion environment. Experimental results show that the flexural beating capacity of the hacking to one beam is bigger than the wheel grinding, the ultimate bending moment has a sharp reduction after environ- mental deterioration, C50 decreases amplitude 12% smaller than C30, for the case of C50, ultimate bending reduced by 4%, 6%, 7.5%, and 4% respectively under the condition of the beam submerge in chlorine salt environment for 7d, 14d, 21d, and 28d. Although hacking beam shows the better reinforcement, the tension in the process of CFRP can produce stress concentration, leading to premature CFRP is pulled, so it sug- gests that increasing bond surface roughness in engineering to improve the ultimate bending moment of re- inforced-beam.