胶层空鼓缺陷对混杂加固RC末端界面性能的影响

针对CFS-GFS混杂加固钢筋混凝土梁的一种新型加固方法,使用非线性有限元方法,考虑胶层处出现空鼓缺陷对HFRP加固界面性能的影响,分别对缺陷尺寸、缺陷位置以及缺陷数量3组界面模型进行了数值模拟,得到了不同缺陷形式下胶层界面剪应力与正应力以及界面处混凝土第1主应力和纤维布轴向应力的分布规律。研究结果表明:胶层剪应力对空鼓缺陷大小的影响较敏感,随缺陷尺寸的增大,胶层端部最大剪应力呈非线性增长趋势。界面端部混凝土第1主应力随缺陷尺寸的增大,数值呈缓慢减小的趋势,且在缺陷空鼓处混凝土第1主应力出现突变。

Influence of Hollow Imperfections of Epoxy Resin on Interface Performances of RC Beams Strengthened with HFRP

The influence of hollow imperfection on mechanical characteristics of interface of RC beams strengthened with HFRP was discussed.By establishing the constitutive equations of different materials,three group interfacial models including imperfection dimension,imperfection location and imperfection amount were simulated by nonlinear finite element method.The shear stress and normal stress of glue layer,the first principal stress of concrete and distributions of different strengthening modes at the interface end were analysed.The computing results show that,the shear stress of glue layer is sensitive for imperfection dimension and increases with the increase of imperfection dimension;the first principal stress of the concrete at the interface end slowly decreases with the increase of the imperfection dimension.