Distributed fibre optic strain sensing -historical bridge in Warsaw

The Gdańsk Bridge is a six-span steel truss bridge, 406.5 m long and 17 m wide, across the Vistula River in Warsaw. It was opened in 1959 after three years of construction. Its characteristic features are two decks: the upper for road traffic and the lower for trams. EpsilonSensors from the Nerve Sensors family were selected and installed on the bridge (surface installation with an appropriate adhesive) to monitor the structural performance of safety- critical steel elements.

DFOS Sensors Installed: EpsilonSensor

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

Detailed monitoring and control of the historic steel truss bridge
Evaluation of the structural performance within local and safety-critical areas
Reliable diagnostic data for expert analysis and 3D FEA validation
Integrated nerve system capable of long-term structural health monitoring

Results of using the DFOS monitoring system

EpsilonSensors were glued to the steel cross frames using two-component epoxy. The locations of the sensors were selected based on the analysis of results from 3D numerical simulations. Due to the importance of the bridge for traffic in the capital city and its historical character, ongoing structural health monitoring of its safety is invaluable. Nerve-Sensors are the perfect solution for this purpose, supported by the reference vibrating wire sensors.

Technical specifications

6 400 measurement points
64 m of sensing path
16 x EpsilonSensors
long-term

Example results

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John Doe

Project partner

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