Abstract: The purpose of this paper is to investigate prediction model for intermediate debonding load carrying capacity of reinforced concrete beam (RC) flexurally strengthened with fiber reinforced polymer (FRP) laminates. A mechanics analysis model of interface crack tip between FRP and concrete was established, which initiated from the root of the main flexural crack. Based on the mechanics analysis model and fracture mechanics theory, a formula for calculation of the energy release rate of interface crack was derived. By regarding the interface fracture energy as debonding criterion, a new prediction model for debonding load carrying capacity of the strengthened beam was proposed in the paper, which not only took into account the effects of bending moment and shear force, but also could directly caculate the debonding load rather than to be translated. Moreover, some experiments data were selected to verify the capability and accuracy of the proposed model. The research results show that the proposed model in this study could be safely and effectively predict the intermediate debonding load carrying capacity of RC beam strengthened with FRP laminates.

Key words:  Fiber reinforced polymer (FRP); Debonding; Interface crack; Energy release rate; reinforced concrete beam (RC)

引    言
1.1 分析模型
1.2 應(yīng)變能計(jì)算
2 加固梁界面剝離分析
2.1 中部開裂截面應(yīng)力
2.2 界面剝離預(yù)測(cè)模型
3 實(shí)驗(yàn)驗(yàn)證
4 結(jié)語

參考文獻(xiàn)

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本文編號(hào)：239546