复杂环境下CFRP-高强混凝土界面性能有限元分析
Finite element analysis on the interfacial properties of high- strength concrete strengthened with CFRP under complex environmental conditions

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。
This paper conducted a numerical simulation about the double-sided shear test, made a finite element analysis about the interfacial bond performance between CFRP and high strength concrete under coupling function of sustaining load and freeze-thaw cycle, coupling function of sustaining load and dry-wet cycle.The simulation results were compared with the experimental results. Freeze-thaw cycle and dry-wet cycle both damage the interfacial bond performance. With the increase of freeze-thaw cycles, specimen limit load and ultimate end of the interface bond-slip decreases, continuous load can make the damage degree increased. On the basis of correctness about the result of simulation, a further analysis about the change rule of the damage form of specimens was made. Specimens failed from concrete shearing failures under the function of freeze-thaw cycle. Failure mode was changed by the shift to adhesive failure between resin and concrete from concrete shearing failures when the dry-wet cycle increases