端部嵌贴CFRP板加固钢筋混凝土结构的斜嵌段粘结性能试验

Experiment of bonding performance of inclined embedded section of RC structure reinforced with near-end enhanced embeded CFRP strip

  • 摘要: 端部嵌贴预应力碳纤维增强复合材料(CFRP)板加固混凝土结构是一种高效经济的新型混凝土结构加固方法,端部嵌贴段的CFRP与混凝土的粘结性能是锚固预应力CFRP、确保加固效果充分发挥的关键因素。为确定端部嵌贴段中斜向嵌贴段CFRP-混凝土的界面粘结性能,本文开展9个单剪拔出试验,研究了斜嵌段的粘结性能。通过设计混凝土棱柱试件,研究了斜槽角度、CFRP板埋深、CFRP板粘结长度对斜向嵌贴界面粘结性能的影响,并基于试验结果构建了CFRP板-混凝土局部界面的粘结-滑移关系模型。试验结果表明:随斜槽角度增大,试件的承载力及CFRP-混凝土局部界面断裂能也在逐渐增大。CFRP-混凝土界面粘结性能随CFRP埋深比增加而明显增加,并在埋深比为50%时达到最大,此后不再明显变化。基于试验结果所建立的粘结-滑移模型能较准确地模拟出CFRP板在混凝土斜槽中的受力过程。

     

    Abstract: Near-end enhanced embedment (NEEE) prestressed carbon fibre reinforced polymer (CFRP) strip is an innovative, efficient and economical technique to reinforce the concrete structure. The CFRP-concrete interfacial bonding performance in NEEE section is the key factor to anchor prestressed CFRP and ensure high efficiency of reinforcement. To clarify the bonding performance of CFRP-concrete interface in the inclined embedded section, which is a part of the NEEE section, nine single-shear pull-out tests with respect to concrete prism specimens were carried out. Factors such as the angle of oblique grooves, embedded depth of CFRP strips and bond length of strengthened region were investigated. Additionally, a bond-slip model of the local interface was presented. The test results show that the load-bearing capacity and fracture energy of specimens increase with the increase of oblique groove angle. The interfacial bonding performance has a positive correlation with the embedded depth of CFRP strips and reaches a maximum with the embedment ratio of 50%, and do not change significantly thereafter. The proposed bond-slip model based on test results could accurately predict the debonding process of CFRP strips in the inclined embedded section.

     

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