Distributed fiber optic systems – application to strain measurement of post-tensioned concrete structures
Résumé
This paper aims to showcase recent advances on Optical Fiber distributed strain measurement sys-tems applied to concrete monitoring. It focuses on their ability to accurately quantify concrete strain in post-tensioned containment buildings of nuclear power plants under various conditions, including instantaneous concrete strain due to pressure tests, delayed concrete strain due to creep/shrinkage, and instantaneous concrete strain due to tendon rupture.
To achieve this, the study considers several mockups including the VeRCoRs building, a 1/3 scale prestressed concrete containment mockup equipped with a large number of monitoring systems. This mockup facilitates the testing and qualification of distributed measurement systems within con-crete structures during both operational phases (for prestressing monitoring) and pressure tests (for measuring instantaneous strain/displacement under pressure). Additionally, a post-tensioned beam was specifically designed and fabricated to examine tendon re-anchorage after cutting.
Another objective is to assess various Optical Fiber Cables (OFC) from different suppliers to ensure reliable measurements. The study also aims to test different installation methods, such as embed-ding the OFC into concrete or attaching them to the external surface using various adhesives.
Mots clés
Optical fiber
civil monitoring
post-tension
containment
Optical fiber civil monitoring post-tension containment List of acronyms Distributed Fiber Optic Sensing (DFOS) Optical Fiber (OF) Optical Fiber Cable (OFC) Vibrating Wire Strain Gauge
containment List of acronyms Distributed Fiber Optic Sensing (DFOS) Optical Fiber (OF) Optical Fiber Cable (OFC) Vibrating Wire Strain Gauge
Domaines
Sciences de l'ingénieur [physics]
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EJECE_full_paper_Distributed_strain_measurement_Optical_Fiber_submission_VF auteurs.pdf (1.88 Mo)
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