Load testing of a composite footbridge with strain and displacement measurements

The innovative foot deck was designed and implemented within an existing bridge in Rzeszów. DFOS fibres were integrated within the composite panels during their production (infusion). This way, the sensors became an integral part of the entire structure. Appropriate fibres arrangement and their full integration inside the composite panels allowed us to utilise the idea of both strain sensing with the EpsilonSensor and vertical displacement sensing with 3DSensor. The ready-to-use smart panels were delivered on-site.

DFOS Sensors Installed: EpsilonSensor and 3DSensor

Project challenges

How to apply non-invasive diagnostics in demanding historic structures?
How to get precise measurement data to detect local damage and imperfection?
How to measure detailed strain profiles over the entire height of the brick masonry wall?

Benefits of using the DFOS monitoring system

Full integration of the sensors with the panel at the production (infusion) stage
Reliable data for structural assessment from a real zero strain/stress state
Simultaneous measurements of strains and displacements (shape changes)
Thousands of measurements points within a single element for self-diagnostics

Results of using the DFOS monitoring system

Example DFOS results (both strains and displacements) obtained during load tests are presented on the plot graph. Very good agreement with reference techniques proved the accuracy, reliability and high-quality performance of the applied solution, which is in line with the basic design of Nerve-Sensors.

Technical specifications

70 800 measurement points
354 m of sensing path
25 x DFOS strain sensors
load tests & long-term

Example results

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John Doe

Project partner

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