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通过纤维增强复合材料(FRP)布加固钢筋混凝土单向板的受弯性能试验,研究了FRP布种类、层数、宽度、粘贴方式和锚固措施等因素对加固效果的影响。结果表明:在板底粘贴CFRP布和高强GFRP布均可明显提高钢筋混凝土单向板的受弯承载力和纵筋屈服后刚度。当采用横向粘贴1层U形CFRP布条作为端部锚固措施时,所有加固单向板试件的破坏模式均为跨中弯曲裂缝引起的剥离破坏。当FRP布宽度和层数相同时,采用CFRP布加固效果优于高强GFRP布加固。与对比试件相比,FRP布加固钢筋混凝土单向板试件的位移延性略有降低。高强GFRP布加固钢筋混凝土单向板的位移延性优于CFRP布加固钢筋混凝土单向板。FRP布的粘贴方式对FRP加固钢筋混凝土单向板的位移延性也有影响,单层FRP布加固单向板试件的延性较好。通过对试验结果的分析,提出了FRP布加固钢筋混凝土单向板构件受弯破坏模式的判别方法,验证了已有文献和GB 50608—2010《纤维增强复合材料建设工程应用技术规范》中给出的跨中弯曲裂缝引起的FRP剥离应变计算公式对FRP布加固混凝土单向板的适用性,建立了FRP布加固钢筋混凝土单向板受弯承载力计算方法。
The flexural performance of reinforced one-way slab reinforced by fiber reinforced composite (FRP) fabric was tested. The effects of FRP fabric types, layer number, width, bonding method and anchoring method on the reinforcement effect were studied. The results show that both CFRP cloth and high-strength GFRP cloth can significantly improve the flexural capacity and the post-yield stiffness of the reinforced concrete one-way slab. When transversely affixed with a layer of U-shaped CFRP strips as the end anchorage, the failure mode of all the strengthened one-way slab specimens is the stripping failure caused by the mid-bend bend. When the width and number of layers of FRP fabric are the same, the CFRP fabric reinforcement is better than that of the high strength GFRP fabric. Compared with the control specimen, the displacement ductility of FRP-reinforced one-way slab specimens decreases slightly. Displacement ductility of reinforced one-way slab strengthened by high strength GFRP cloth is better than that of CFRP cloth reinforced reinforced concrete one-way slab. The way of FRP cloth affixing also affects the displacement ductility of FRP reinforced one-way slab. The ductility of single-layer FRP sheet reinforced one-way slab is better. Through the analysis of the test results, a method to judge the bending damage mode of reinforced concrete one-way slab by FRP fabric is put forward, and the existing literature and GB 50608-2010 “Technical Specification for Fiber Reinforced Composites Construction Project” are given The calculation method of the FRP peel strain caused by the mid-bending cracks in the CFRP sheet reinforced concrete one-way slab is established. The calculation method of flexural capacity of FRP sheet reinforced concrete one-way slab is established.