Anchorage zone: bi-directional analaysis of internal strain field
The installation involves EpsilonSensor-based arrays for longitudinal and vertical strain measurement within the anchorage zones of post tensioned giders. The novelty of the present study is that the EpsilonSensors were embedded inside the concrete. The procedure was possible thanks to the appropriate stiffness of the sensors, small enough to allow the curves to be freely shaped, yet large enough to keep the measurement sections straight without pretensioning.
DFOS Sensors Installed: EpsilonSensor
Project challenges
Benefits of using the DFOS monitoring system
Results of using the DFOS monitoring system
The important benefit of precise readings with EpsilonSensor is that the tensile strength of the element can be idetified directly by comparing two strain profiles: just before and just after cracking. This was ilustrated in the first graph showing the results for longitudinal section „A” during the load tests. The second graph shows the vertical strain profiles after prestressing for sections I – VII, located at different distances from the girder face. The extreme strain values, both in compression and tension, occurred within the section I, the closest to the anchorages.
Example results
Recomendations (optional)
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John Doe
Project partner
