Abstract
Technology of strengthening reinforced concrete structures with composite materials has found wide application. The effectiveness of strengthening of concrete structures with externally bonded reinforcement is supported by a great deal of experimental evidence. However, the problem of serviceability of such structures has not been adequately explored. The present work describes the results of experimental studies on the loadcarrying capacity of concrete beams strengthened with carbon fiber reinforced plastic (CFRP). Special emphasis is placed on studying the debonding of the strengthening layer from the concrete surface and analyzing its influence on the load-carrying capacity of beams. Infrared thermography is used to detect the first signs of debonding and to assess the debond growth rate.
Highlights
A t present, the technology of strengthening reinforced concrete structures with composite materials is extensively used in the constructional industry
In designing structures reinforced with composite materials, the liming state of such structures is considered to be the state of structure deformation, at which the debonding of the composite material from the concrete surface occurs
For the beams, whose surface had been cleaned with a wire brush before sticking carbon fiber reinforced plastic (CFRP), the delamination occurred according to the adhesive scenario
Summary
A t present, the technology of strengthening reinforced concrete structures with composite materials is extensively used in the constructional industry. This work studies the debonding of CFRP sheet from the surface of reinforced concrete beams subjected to bending loading. The choice of such reinforcement was mainly caused by the condition of equal strength for beam elements in bending. In order to make a decision on the existence of bebonding at the point with the coordinates x , y , we calculate a threshold value for the temperature contrast C * For making it estimate, we determine, at each loading step, the average value C j and the standard deviation j in those areas of the thermograms, where debonding is known to be absent.
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