Abstract
The strain-measuring capability of fiber optic strain gages infiber-reinforced polymer (FRP) rebars was investigated for failure-inducingloads. Fiber optic interferometric sensors were embedded in a pultrudedcarbon fiber core and then another layer of carbon fibers were filamentwound around the core to form a shell. Pultrusion and filament windingtechniques protect the fiber optic strain gages from the concreteenvironment while providing a secure bond to the core and additionalductility to the overall FRP rebar. Tests of coupon FRP rebar and ofFRP-rebar-reinforced concrete beams show that the fiber optic strain gagescan read internal strain through failure and can duplicate data fromconventional linear variable differential transformers and electricalresistance strain gages. Also, the shell of the FRP rebar inside theconcrete beams failed before the rebar core providing pseudo-ductility.
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