The results of experiments at home and abroad show that using CFRP plates on the side to strengthen reinforced concrete beams can improve the mechanical performance obviously. However, there are no relevant design provisions in current Chinese codes. This paper presents that the calculation method research on flexural capacity of normal section of reinforced concrete beams strengthened with CFRP Plates on the side and 2 failure modes are put forward based on analysis of the ultimate bearing capacity state of flexural section. In order to verify the proposed formulas, experimental studies on 6 concrete beams strengthened with CFRP Plates on the side are carried out, and the results are compared with the formulas, which has a good applicability.
Carbon Fiber Reinforced Polymer (CFRP) has been widely used in the field of structural reinforcement and rehabilitation. It would be incorporated with the Optical Fiber Bragg Grating (OFBG) sensing feature, developing the smart carbon fiber reinforced plates (CFRP-OFBG). And then, embedded experiment on five rectangular section beams strengthened with the smart carbon fiber plates were carried out and detected wavelength variation by OFBG to calculate the strain value of carbon fiber plates. Measured center wavelength variation of CFRP-OFBGs and measured strain of CFRPs from strain gauges at the same location were analyzed and plotted by computer. The results demonstrated that: on the one hand, both wavelength and strain showed a better linear relationship, and the slope was about / 2 . 1 pm . It was in good agreement with the CFRP-OFBG strain sensing degrees, which was / 281 . 1 pm. On the other hand, using CFRPs to strengthen concrete beams could improve the yield load and ultimate load and reduce deformability of concrete beams. In summary, there are the widely application prospect and value on structural health monitoring and structural reliability analysis in the future.
Fiber-reinforced polymer (FRP) strengthening systems are widely accepted in engineering practice as means to enhance the flexural strength of RC members, but resulting in decreased ductility. To improve the flexural capacity of RC beams strengthened with CFRP plate, but also to ensure the enough ductility, a study was carried out. Putting forward the design method of CFRP embedded reinforcement beams based on ductility ability. The result of the study revealed that the method was reliable by the analysis of an example, and the method can be used in the design of reinforcement project.
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