For the structural monitoring of railway bridges, electromagnetic interference (EMI) is a significant problem as modern
railway lines are powered by high-voltage electric power feeding systems. Fiber optic sensing systems are free from EMI
and have been successfully applied in civil engineering fields. This study presents the application of fiber Bragg grating
(FBG)-based sensing systems to precast concrete box railway bridges. A 20 m long full-scale precast concrete box
railway girder was fabricated and tested in order to identify its static performance. The experimental program involved
the measurement of the nonlinear static behavior until failure. Multiplexed FBG strain sensors were embedded along the
length of steel rebar and a strain-induced wavelength shift was measured in order to monitor internal strains. The
measured values from the FBG-based sensors are compared with the results using electric signal-based sensors. The
results show that the FBG sensing system is promising and can improve the efficiency of structural monitoring for
modern railway bridges.
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