Analysis of fiber-optic strain-monitoring data from a prestressed concrete bridge

Graham Webb, Paul Vardanega*, Neil Hoult, Paul Fidler, Peter Bennett, Campbell Middleton

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

50 Citations (Scopus)
633 Downloads (Pure)


This paper presents data from fiber-optic strain monitoring of the Nine Wells Bridge, which is a three-span, pretensioned, prestressed concrete beam -and-slab bridge located in Cambridgeshire in the United Kingdom. The original deployment at the site and the challenges associated with collecting distributed strain data using the Brillouin optical time domain reflectometry (BOTDR) technique are described. In particular, construction and deployment issues of fiber robustness and temperature effects are highlighted. The challenges of interpreting the collected data as well as the potential value of information that may be obtained arediscussed. Challenges involved with relating measurements to the expected levels of prestress, including the effects due to debonding, creep, and shrinkage, are discussed and analyzed. This paper provides an opportunity to study whether two commonly used models for creep and shrinkage, adequately model data collected in field conditions.
Original languageEnglish
Article number05017002
Number of pages14
JournalJournal of Bridge Engineering
Issue number5
Early online date3 Feb 2017
Publication statusPublished - 1 May 2017


  • Brillouin optical time domain reflectometry (BOTDR)
  • Concrete creep
  • Concrete shrinkage
  • Prestressed concrete
  • Strain measurement
  • Structural health monitoring


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