Load testing of toothed cable anchors -structural check of a new bridge

During constructing three railway bridges in Kraków, engineers decided to apply a new structural solution. Steel cable anchorages were embedded inside the concrete. To improve their bonding properties, they were shaped with teeth. To assess the effectiveness of both the friction and mechanical teeth-influenced connection, EpsilonSensors and DFOS strain sensors were glued on the surfaces of the steel anchorage. Measurements were performed during its tensioning.

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 control of the teeth-shaped steel anchorage during cable’s tensioning
Analysis of interaction between the concrete and steel anchorage inside it
Reliable diagnostic data for expert analysis and 3D FEA validation
Confirmation of theoretical predictions to optimise similar structures in the future

Results of using the DFOS monitoring system

Based on the results obtained from glued EpsilonSensors while tensioning the cable, it was possible to analyse in detail all local events and disturbances within the steel anchorage. They were caused by the unregular geometry of this element, including teeth, openings or changes in widths. The example results with events identification are presented on the below graphs in relation to post-installation documentation.

Technical specifications

11 538 measurement points
15 m of sensing path
2 x ES, 2 x DFOS sensors
short-term (load tests)

Example results

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