纤维增强复合材料加固钢筋混凝土单向板受弯性能研究

发布时间：2018-11-27 08:03

【摘要】：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。
[Abstract]:Based on the flexural behavior test of reinforced concrete unidirectional slabs strengthened with fiber reinforced composite (FRP) sheets, the effects of the types of FRP sheets, the number of layers, the width, the bonding methods and the anchoring measures on the strengthening effect were studied. The results show that the flexural bearing capacity and the yield stiffness of reinforced concrete unidirectional slabs can be significantly improved by sticking CFRP sheets and high strength GFRP sheets to the bottom of the slab. When one layer U-shaped CFRP strip is used as the end anchoring method, the failure mode of all the strengthened unidirectional plate specimens is the peeling failure caused by mid-span bending crack. When the width of FRP cloth and the number of layers are the same, the reinforcement effect of CFRP cloth is better than that of high strength GFRP cloth. Compared with the contrast specimen, the displacement ductility of the reinforced concrete unidirectional slabs strengthened with FRP sheets is slightly reduced. The displacement ductility of reinforced concrete unidirectional slabs strengthened with high strength GFRP sheets is better than that with CFRP sheets, and the displacement ductility of FRP reinforced concrete unidirectional slabs is also affected by the paste mode of FRP sheets. The ductility of unidirectional plate strengthened with single layer FRP cloth is good. Based on the analysis of the test results, a method for judging the bending failure mode of reinforced concrete unidirectional slab members strengthened with FRP sheets is proposed. The applicability of the calculation formula of FRP peeling strain caused by mid-span bending cracks given in the previous literature and GB 50608-2010 "Technical Specification for Fiber reinforced Composites Construction Engineering" for strengthening unidirectional concrete slabs with FRP sheets is verified. The calculation method of flexural bearing capacity of reinforced concrete unidirectional slabs strengthened with FRP sheets is established.
【作者单位】：郑州大学土木工程学院;华北水利水电大学水利学院;
【基金】：国家自然科学基金项目(51178434) 河南省教育厅科学技术研究重点项目(15A560040)
【分类号】：TU375.2

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