The reinforcement of bearing structures with secondary glued reinforcement has been practiced successfully for a long time. Thereby steel plates have been used for circa 50 years and FRP plates have been used for circa 25 years. Compared to steel the carbon fiber has some important advantages, for example the higher elastic modulus (up to 50%) and the higher tension strength. The load bearing behavior of Carbon Fiber Reinforced Polymer (CFRP) is significantly influenced by the properties of the matrix, the fiber and the interface between both. Thereby some important disadvantages of the brittle materials must be considered, for example the low ductility of the bond between CFRP and concrete and brittle failure of FRP. With embedded sensor systems it is possible to measure crack propagation and strains. In this paper a sensor based CFRP system will be presented, that can be used for strengthening and measuring. On the basis of four point bending tests on beams (dimensions of 700×150×150 mm) the potential of the system is introduced. Primarily a comparison of two different measurement methods (Strain Gauge and Fiber Bragg) is shown.
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- Sensor CFRP-Sheets for the Controlled Strengthening and Retrofitting of Reinforced Concrete Members
- Springer Berlin Heidelberg