Abstract
Fiber-reinforced polymer (FRP) composites have been used to strengthen and retrofit deteriorated or deficient structures, especially concrete structures. The performance of the rehabilitated structure is highly influenced by the bonding between concrete and FRP, and the existence of potential defects at the concrete/FRP interface and in the FRP laminates. Research has shown that fiber optic sensing technologies provide more advantages over conventional non-destructive evaluation (NDE) methods in measuring strain distribution along the bond interface or in the FRP composite, and therefore to detect failure or monitor the performance of the rehabilitated structure. The chapter begins with a brief review of the recent development and advancement of fiber optic sensing technologies, including different types of fiber optic sensors (FOSs) and their applications to civil engineering structures. By embedding FOSs in the FRP composites or at the bond interface between concrete and FRP composites, the fiber optic sensing system provide a promising NDE tool for performance assessment of FRP rehabilitated structures. Field applications of FOSs to FRP strengthened or retrofitted bridges showed that smart structure systems with fiber optic sensors are reliable for real-time monitoring of FRP rehabilitated concrete structures.
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