| Compared with the traditional strengthening technology using Carbon Fiber Reinforced Polymer(CFRP), the strengthening technology using Prestressed CFRP has a series of merits. But the research on the strengthening technology using Prestressed Carbon Fiber Reinforced Polymer is rare in our country now, especially the literature about the steel beams strengthened by the Prestressed CFRP has not been seen. Based on the foreign and native research production, in this paper the experimental research and the theoretical analysis are be done about the flexural performance of the steel beams strengthened by the Prestressed CFRP, and the theoretical calculating system of the steel beams strengthened by the Prestressed CFRP is established.In the experimental research in this paper, the effect of the dosage of Prestressed CFRP and the magnitude of the stress of the Prestressed CFRP are taken into consideration. Experimental results indicate that the strengthening technology using Prestressed CFRP can improve the load capacity of steel beams and enhance section stiffness. At the same time, the failure process and failure form of the beams have been observed, moreover, the strain of the section of steel beams bonded the CFRP has been proved to be linear to the distance to the neutral axis.The steel beams strengthened by the Prestressed CFRP are analyzed with the theory of composite beams and the theory of plasticity . Thus, the formulas about the bend strength of the tested beams are derived. The effect of secondary loading on the normal section flexural load-bearing capacity is also analyzed. Furthermore, the formulas about the deflection of the tested beams are also proposed through the continuous double integral method and the virtual principle. The results of theoretical analysis are in good agreement with the experimental ones. |
