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通过对12根试验梁进行冻融循环作用下预应力CFRP板加固钢筋混凝土梁的界面粘结性能试验研究,考察了CFRP板初始应力水平、冻融循环次数及混凝土强度等因素对CFRP-混凝土界面粘结性能的影响。试验结果表明:随着冻融循环次数的增加,加固试件界面粘结应力的劣化速率逐渐增大,薄弱环节逐渐由混凝土保护层向粘结界面发展;CFRP板初始应力和冻融循环的耦合作用对粘结界面的劣化效应较单一的冻融循环作用更加显著,而且随着CFRP板初应力水平的增加,这种劣化效应会逐渐加剧;混凝土强度等级为C60的预应力CFRP板加固试件在冻融侵蚀作用下的界面粘结性能退化速率较C30加固试件更加显著。
The experimental research on the interfacial adhesion of reinforced concrete beams strengthened with prestressed CFRP sheets under the action of freeze-thaw cycles of 12 test beams was conducted. The effects of initial stress level, number of freeze-thaw cycles and concrete strength on the interfacial adhesion of CFRP- Effect of bonding properties. The experimental results show that with the increase of the number of freeze-thaw cycles, the rate of degradation of the interface bond stress increases gradually, and the weak link gradually develops from the concrete cover to the bond interface. The coupling between the initial stress of CFRP board and the freeze-thaw cycle The degradation effect of the interface is more significant than that of the single freeze-thaw cycle. With the increase of the initial stress level of CFRP plate, the deterioration effect will be aggravated gradually. The prestressed CFRP plate reinforced concrete with the strength level of C60 The degradation rate of interfacial adhesion under the effect of freeze-thaw erosion is more significant than that of C30-strengthened specimens.