Vibration-based monitoring of an FRP footbridge with embedded fiber-Bragg gratings: Influence of temperature vs. damage

An attractive feature of FRP structures is that Fiber-Optic Sensors (FOS) can be naturally embedded during the production process and provide important structural information immediately after construction. Thus, FOS became very useful also for Vibration-Based Monitoring (VBM) applications. In VBM, damage identified by detecting damage-related changes in modal characteristics a structure, such as natural frequencies strain mode shapes. However, exhibit low sensitivity to certain types damage, especially when compared their temperature. Strain shapes though have been proved more sensitive local less temperature than frequencies. this work, an footbridge subjected periodic annual VBM. The dynamic strains bridge are monitored with Fiber-optic Bragg Gratings (FBG), type allows determining accurately from low-amplitude data. Vibration modes influence heavy loading investigated. used calibrating finite element model. Possible scenarios on simulated investigated