科研之友
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摘要
Experiments on the reinforced concrete one-way slabs strengthened with fiber reinforced polymer (FRP) sheets were conducted to study the influences of the type of fiber sheets, the number of fiber sheet layers, width of fiber sheet, bonding types and anchorage methods on its flexural performance. Results show that the bearing capacity and the rebar post-yield stiffness of the reinforced concrete one-way slabs can be significantly improved through strengthening CFRP sheets and high strength GFRP sheets under the slab bottom. When using one layer of transverse U-shape CFRP sheet strip as the end anchorage measures, the failure modes of all the specimens are CFRP sheets debonding that is induced by intermediate crack. When the layers and width of the FRP sheets are all the same, the strengthening effect of using CFRP sheets is better than using the high-strength GFRP sheets. Compared to the control specimen, the ductility of reinforced concrete one-way slabs strengthened with the high-strength GFRP sheet is better than CFRP sheets, both of which are lower than that of the normal RC slabs. The bonding way of FRP sheets has an effect on the ductility of the reinforced concrete one-way slabs while the ductility of the reinforced concrete one-way slab specimens strengthened with single layer of FRP sheet is optimal. Method for distinguishing failure mode of reinforced concrete one-way slab member reinforced with FRP sheet is proposed through analysis. Meanwhile, the applicability of the intermediate crack-induced debonding strain prediction formulas, which are given in the literature and in GB 50608-2010 'Technical code for infrastructure application of FRP composites', is checked when they were used for the reinforced concrete one-way slabs strengthened with FRP sheets. Meanwhile, the method for calculating the flexural capacity of reinforced concrete one-way slabs strengthened with FRP sheets is established.
- 出版日期2015
- 单位郑州大学
