AbstractIn this study, the effect of temperature variation on prestress force monitoring by fiber Bragg grating (FBG) sensors embedded in prestressing tendons of prestressed concrete (PSC) girders is estimated. First, a fiber optic sensor (FOS)-based prestress force monitoring method is proposed for PSC girders with unbonded tendons. A temperature-effect estimation method is modeled to theoretically estimate the change of prestress force due to the temperature variation. Second, lab-scale experiments are performed on a PSC girder with a FBG sensor-embedded smart tendon. A series of temperature-variation and prestress-loss events are simulated for the PSC girder. Third, the feasibility of the FOS-based monitoring method is experimentally evaluated for the prestress-loss cases under constant temperature. Finally, the effect of temperature variation on the FBG sensor-embedded tendon is evaluated by the temperature-effect estimation method.
FOS-Based Prestress Force Monitoring and Temperature Effect Estimation in Unbonded Tendons of PSC Girders
2016
Aufsatz (Zeitschrift)
Englisch
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