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利用ABAQUS有限元分析软件,对持续荷载与冻融循环耦合作用下以及持续荷载与干湿循环耦合作用下CFRP加固高强混凝土双面剪切试件的界面黏结性能试验进行有限元模拟,将模拟结果与已有试验结果进行对比。结果表明:有限元模拟的计算值与试验结果吻合较好,2种复杂环境均会造成黏结界面的损伤,随着冻融循环与干湿循环作用次数的增加,试件界面的极限荷载、极限端部黏结滑移均随之降低,持续荷载的施加使降低程度加剧。在验证模拟结果正确的基础上,进一步分析试件的破坏形态的变化规律,在冻融循环作用下,试件发生混凝土内部剪切破坏;随着干湿循环作用次数的增加,试件的破坏方式由混凝土内部剪切破坏逐渐转变为界面的黏结破坏。
The ABAQUS finite element analysis software was used to simulate the interfacial bonding behavior of CFRP-strengthened high-strength concrete double-faced shear specimens under the coupling of continuous load and freeze-thaw cycles, and the coupling of continuous load with wet-dry cycle. The simulation results Contrast with existing test results. The results show that the calculated values of the finite element simulation agree well with the experimental results. Both of the two complex environments can cause the damage of the bonding interface. With the increase of the number of cycles of the freeze-thaw cycle and the wetting-drying cycles, the ultimate load and the limit of the interface End bond slip are reduced, the application of sustained load to make the degree of reduction worse. On the basis of verifying the correctness of the simulation results, the variation regularity of the failure morphology of the specimen was further analyzed. Under the action of freeze-thaw cycle, the specimens were subjected to internal shear failure. With the increase of the number of wetting-drying cycles, Way from the concrete shear failure gradually transformed into the interface bonding damage.