EXPERIMENTAL RESEARCH ON VARIABLE BONDING OF RC BEAMS STRENGTHENED BY PRESTRESSED CARBON FIBER PLATE

By using self-developed a set of prestressed carbon fiber plate ( CFRP Plate) anchoring and stretching machine，with carbon fiber plate being stretched and anchored on the surface of three 5. 6 m long concrete beams， experiments were made on using bonded prestressed CFRP plate to reinforce concrete flexural member． It was also analyzed comparatively the effects of using or unusing organic adhesive，as well as using electric heater to produce bond in the earlier stage and without bond in the later stage between the carbon fiber plate and concrete flexural member on the cracks and bearing capacity of the said concrete member． The test results showed that variable bonding prestressed carbon fiber plate had the characteristics of unbounded and bonded prestresses．