Strains in concrete column under laboratory conditions

The concrete columns (Ø = 300 mm, H = 1200 mm) were studied at Gdańsk University of Technology to simulate the compressive behaviour of concrete piles under load tests. The column was reinforced with IPE profiles. EpsilonSensors (ES) were embedded in the concrete, while EpsilonFlats (EF) (sensors with rectangular cross section and with no external braid) were bonded directly to the steel section. The DFOS readings were verified by a number of independent reference techniques.

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

Measurements of distributed strains both in concrete and steel reinforcement
Analysis of column behaviour in relation to theoretical predictions
Thousands of measurement points for comparison with reference techniques
Design and optimisation of real load tests and data interpretation

Results of using the DFOS monitoring system

The strain profiles along one of the EpsilonSensor sections are shown in the figure below. Based on the raw strain data, advanced structural analysis is possible, including the study of concrete-steel interaction, detection of local events, calculation of shortenings, force, stress, curvatures and much more.

Technical specifications

2 880 measurement points
14 m of sensing path
8 x EpsilonSensor, 4 x EF
short-term (load tests)

Example results

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