Abstract
The existence of a coating on an optical fiber results in a difference between the strain of the matrix concrete and the strain sensed by embedded fiber optic sensor. This paper deals with the theoretical model for internal strain measurement of concrete in uniaxial compression by embedded fiber optic sensor. The fiber core and the matrix concrete were supposed to be elastic, but the coating of the optical fiber was assumed to be ideal elasto-plastic. And the bonding surfaces were supposed to be intact, that is to say, there is no relative slip deformation at the interface between the matrix concrete and the coating of the optical fiber and that between the coating and the fiber core. Based on these assumptions, a theoretical model was developed for internal strain measurement of concrete in compression. Some experiments for concrete specimens in uniaxial compression were done to verify the validation of the theoretical model. And the comparison indicates a good agreement between the experimental and theoretical results.
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