| In this paper the author study on two main forms of the CFRP concrete beams' debonding failure. The two forms are the Spin-off-plane shear and the Bending reinforcement stripping. And the author put forward a numerical calculation model for the two forms and makes an assay of the CFRP concrete beams of the failure mechanism of interfacial spin-off. Based on the results of numerical analysis and experimental, the author set up the CFRP concrete beams spin-off bearing capacity calculation model. And propose a practical formula to simplify the design. There are three researches and innovative achievements.(1) The author study on the CFRP composite beam of concrete flexural properties through the test. Summed up the combination of CFRP concrete beams damage forms and analysis the reasons for the destruction. Put forward a simple and more rational calculation of bearing capacity for the Spin-off-plane shear. Comparison of calculated results with experimental data, they are in good agreement.(2) Studied on the CFRP concrete beams shear performance. Analysis of shear damage to the two modes, namely CFRP pull off and CFRP debonding failure mode and analysis of the impact of CFRP reinforced concrete beam shear strength. According to the experimental results, the specimen damaged because of the end CFRP peeling, the experimental results coincide with the theoretical analysis.(3) Based on the understanding of the mechanism of debonding failure, the author set up a mechanical model. According to the shear reinforcement of problem dissection finite element analysis and experimental analysis, CFRP stress distribution and inclined cracks was discussed.When the CFRP and concrete width ratio is 0.5, the bearing capacity improved significantly. And with the CFRP layers increased, the capacity decreased. And propose a practical formula to simplify the design in this paper. The results contrast with the numerical simulation is in good agreement. |
