Assessment of an instrumented reinforced-concrete bridge with fiber-reinforced-polymer strengthening

Steve E. Watkins, James W. Fonda, Antonio Nanni

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Field instrumentation is investigated on an in-service highway bridge over a 2-year period. Extrinsic Fabry-Pérot interferometric (EFPI) strain sensors provide a permanent health-monitoring capability. The bridge is a reinforced-concrete (RC) structure that was repaired and strengthened using fiber-reinforced-polymer (FRP) wraps. A sensor network monitors the load-induced strain in the FRP reinforcement and the steel rebar. Colocated electrical resistance strain gauges and a finite element analysis are used for comparison. Both dynamic and static load characteristics are analyzed for a near-capacity truck. The fiber optic measurements are generally consistent with the comparison measurements and the analytical results; and they show no failure or degradation as opposed to the electrical resistance gauges. We demonstrate the implementation and the performance of in situ EFPI sensors in a longterm field environment. Embedded fiber optic sensors can provide the required information for the intelligent management of a transportation infrastructure.

Original languageEnglish (US)
Article number051010
JournalOptical Engineering
Issue number5
StatePublished - May 2007
Externally publishedYes


  • Fiber optic sensors
  • Metrology
  • Nondestructive testing
  • Smart structures
  • Strain analysis

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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