Abstract
The experimental studies provide valuable information for strain sensing techniques of the civil concrete structures rehabilitated with FRP by using FBG sensors. A fiber optic sensor system was applied in measurement of strains over the interfacial zones of CFRP bonded reinforced concrete specimens. Embedded FBG sensors can reveal the true strain in a structure in real time compared with externally bonded strain sensing devices, particularly for a structure which is covered by an externally bonded composite. There were no drops in the sensor strains before the peeling failure, since the sensor was long enough to cover the failed as well as undamaged section of the FRP. These findings were used as a basis for the development of relationships for modeling the debonding of the CFRP substrate from the concrete. This is a preliminary study to investigate appropriate usage of the fiber optic sensors in rehabilitated structures. Moreover, the insights gained will facilitate development of more accurate failure models for FRP strengthened structures.
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