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为深入研究FRP-混凝土界面剥离破坏机理,弥补试验观测手段的不足,基于9组双剪切模型试验,应用数值分析方法,将混凝土塑性损伤模型、Cohesive behavior和界面双线性粘贴-滑移模型应用到分析中,实现了混凝土损伤、FRP-混凝土界面滑移的模拟。研究结果表明:未进行深度处理的构件,其极限荷载值均偏小,FRP强度利用率最大仅为48.31%。增加FRP粘贴层数可以有效提高极限荷载,但同时FRP材料强度利用率却明显降低;本文分析方法得到的极限荷载与试验值较为接近,最大偏差在10%左右;FRP-混凝土界面开裂的深度约为1cm,损伤宽度为FRP粘贴范围的1.5~2.0倍;界面峰值应力处的滑移量约为0.5~0.7mm,极限滑移量为1.5~2.0mm。通过与实测值比较,验证了本文方法的可靠性和科学性,弥补了试验测试手段的不足。
In order to further study the mechanism of FRP-concrete interface peeling and make up for the lack of experimental observation methods, based on nine double shear model tests, the plastic damage model, Cohesive behavior and Bilinear Paste-Slip model Applied to the analysis, the simulation of concrete damage and FRP-concrete interface slip was realized. The results show that the ultimate load values of the members without deep treatment are all small, and the maximum FRP strength utilization rate is only 48.31%. Increasing the number of FRP layers can effectively increase the ultimate load, but at the same time the FRP material strength utilization rate is significantly reduced. The ultimate load obtained by this method is close to the experimental value with the maximum deviation being about 10%. The depth of FRP-concrete interface cracking is about 1cm, the damage width is 1.5-2.0 times the FRP affixing range; the slip at the interface peak stress is about 0.5-0.7mm, and the ultimate slip is 1.5-2.0mm. By comparing with the measured data, the reliability and scientific of the method in this paper are verified, which makes up for the shortcomings of the test and testing methods.