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Smart Monitoring of the FRP Composite Bridge with Distributed Fibre Optic Sensors

Smart Monitoring of the FRP Composite Bridge with Distributed Fibre Optic Sensors

Considering the worldwide recognized advantages of fibre optic sensors as measuring devices in the SHM of the FRP bridges and the unique ability to measure the long-range distributed strain and temperature along the entire bridge superstructure, the distributed fibre optic sensors (DFOS) technology was chosen for the SHM system of the first Polish all-composite FRP bridge. The initial results of the SHM with DFOS technology are the main subject of the paper. Analysis of the results obtained in the field proved the effectiveness of the distributed fibre optic sensors based on Rayleigh scattering for SHM purposes. Wide range of practical problems related to sensor installation, fibre connection, and data processing were successfully solved in the pilot field application described in this paper.  The smart DFOS sensors can ensure acceptable measurement accuracy,  thereby providing reliable strains referring to time-dependent behaviour of the FRP bridge span to assess the safety and serviceability of the all-composite bridge.

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