First-time demonstration of measuring concrete prestress levels with metal packaged fibre optic sensors

I Mckeeman, G Fusiek, M Perry, M Johnston, M Saafi, P Niewczas, M Walsh, S Khan

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
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In this work we present the first large-scale demonstration of metal packaged fibre Bragg grating sensors developed to monitor prestress levels in prestressed concrete. To validate the technology, strain and temperature sensors were mounted on steel prestressing strands in concrete beams and stressed up to 60% of the ultimate tensile strength of the strand. We discuss the methods and calibration procedures used to fabricate and attach the temperature and strain sensors. The use of induction brazing for packaging the fibre Bragg gratings and welding the sensors to prestressing strands eliminates the use of epoxy, making the technique suitable for high-stress monitoring in an irradiated, harsh industrial environment. Initial results based on the first week of data after stressing the beams show the strain sensors are able to monitor prestress levels in ambient conditions.
Original languageEnglish
Article number095051
Number of pages10
JournalSmart Materials and Structures
Issue number9
Publication statusPublished - 24 Aug 2016


  • fibre Bragg gratings
  • fibre optic sensors
  • structural health monitoring
  • prestress levels
  • monitoring
  • prestressed concrete
  • induction brazing
  • calibration
  • strain sensors

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