【摘要】 循环荷载作用下CFRP-混凝土界面粘结-滑移关系是研究CFRP加固混凝土结构疲劳性能的重要基石.通过对18个双面剪切试件进行静载及疲劳试验,分析探讨了循环荷载作用下CFRP-混凝土界面破坏过程及粘结-滑移关系.结果表明,随着循环荷载次数及应力水平增大,界面粘结性能降低,CFRP片材也更早出现剥离现象,剥离长度和应力水平呈线性关系;端部滑移变化表现为两个阶段,快速增长阶段和稳定增长阶段;应力水平越高,对应的粘结-滑移曲线中最大剪应力就越大.更多还原

【Abstract】 The bond-slip relationship of CFRP-concrete interface under cyclic loading is an important cornerstone to study the fatigue performance of concrete structures strengthened with CFRP. Based on the static and fatigue tests of 18 double-sided shear specimens, the interface failure process and bond-slip relationship of CFRP-concrete under cyclic loading are analyzed and discussed. The results show that the interfacial bond properties decrease with the increase of cyclic load times and stress level, and the peeling phenomenon of CFRP sheet appears earlier, and there is a linear relationship between peeling length and stress level; the change of end slip can be divided into two stages, rapid growth stage and stable growth stage; the higher the stress level is, the greater the maximum shear stress in the corresponding bond-slip curve is.更多还原