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体外粘贴预应力FRP技术和表层嵌贴FRP加固技术均是FRP应用于混凝土结构加固的重要技术,但存在各自的局限和不足。表层嵌贴预应力FRP技术有望结合上述两种技术的优点,进一步提高FRP加固混凝土结构的优势和效能。该文在研制成功FRP板条夹具的基础上,加固并进行了5根钢筋混凝土受弯构件的试验研究,深入考察了各试件尤其是表层嵌贴加固试件的力学行为与破坏形态,对比了体外与表层嵌贴加固试件的承载与变形性能差异,分析了预应力的存在对表层嵌贴加固构件力学性能与破坏模式的影响。试验结果表明:表层嵌贴预应力FRP板条加固显著提高了受弯构件的承载性能,其改善效果与体外粘贴预应力FRP板加固非常接近;嵌贴方式可使粘结树脂代替机械锚具锚固预应力FRP板条,但该文试验中表层嵌贴加固试件的破坏形态为粘贴端部的树脂-混凝土界面剥离和保护层混凝土撕裂,因此有需要就提高界面粘结能力和抑制保护层混凝土撕裂的构造措施开展进一步研究。
In vitro paste prestressed FRP technology and surface embedded FRP reinforcement technology are the important technology of FRP used in the reinforcement of concrete structures, but have their own limitations and deficiencies. Surface prestressed embedded FRP technology is expected to combine the advantages of the above two technologies to further improve the strength and effectiveness of FRP reinforced concrete structures. Based on the successful development of FRP lath jig, the experiment of five reinforced concrete flexural members was reinforced and carried out. The mechanical behaviors and failure modes of each specimen, especially the surface embedded and strengthened specimens were investigated in depth. The difference of bearing and deforming properties between in vitro and inlay reinforcement specimens was analyzed. The influence of prestressing on the mechanical properties and failure modes of surface reinforcement members was analyzed. The test results show that the reinforcement of prestressed FRP laths embedded in the surface significantly improves the bearing capacity of the flexural members, and the improvement effect is very close to that of the prestressed FRP plates pasted in vitro. The lamination method allows the adhesive resin to replace the mechanical anchorage Prestressed FRP slats, but the text of the test surface embedded reinforcement specimens destruction morphology paste the end of the resin-concrete interface stripping and protective layer of concrete tear, it is necessary to improve the interface bonding ability and inhibit the protective layer Concrete tearing structural measures for further study.