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Mid-America Transportation Center

Use of Fiber Bragg Grating (FBG) Sensors for Performing Automated Bridge Pier Structural Damage Detection and Scour Monitoring

Final Report
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Researchers

  • Principal Investigator: Thanos Papanicolaou (apapanic@engineering.uiowa.edu 319-335-6448)
  • Graduate Students
  • Christopher Wilson
  • Project Status
    Complete
    Sponsors & Partners
  • University of Iowa Department of Civil and Environmental Engineering
  • About this Project
    Brief Project Description & Background
    The goal of the proposed research is to conduct laboratory and field research on fully adaptive bridge monitoring using automated sensors to minimize the problems inherent in human inspections of bridges. We propose a novel integrated condition-based maintenance (CBM) framework utilizing available sensors and sensing architecture, for performing both scour and structural damage monitoring.
    Research Objective
    The primary goal of this study is the development and evaluation of a two-wave mixing (TWM), fiber-optic pier impact detection system. This system can sense deformations either in the pier structure and/or within the soil (sediment) river bed. In order to accomplish this goal, the following approach has been developed, which incorporates both laboratory and field components. The laboratory component of this study, which is the primary focus of the project, will address the calibration of the FBGs and the optimization of the field installation. The lab component will also address uncertainties due to material properties, measurement noise and modeling errors, and uncertainties (stemming from future anticipated loads and environmental conditions)
    Potential Benefits
    The proposed methodology will assist engineers in monitoring bridge structures during extreme conditions, when failure is most likely, thus improving the overall infrastructure safety by offering new opportunities for monitoring high risk sites such as highway bridge crossings where there is frequent traffic.
    Abstract
    The goal of the proposed research is to conduct laboratory and field research on fully adaptive bridge monitoring using automated sensors to minimize the problems inherent in human inspections of bridges. We propose a novel integrated condition-based maintenance (CBM) framework utilizing available sensors and sensing architecture, for performing both scour and structural damage monitoring. A fiber-optic pier impact detection system is proposed to be developed and tested in the laboratory and the field. That system consists of state-of-the–art, two-wave mixing (TWM) fiber Bragg Grating (FBG) sensors which can detect impacts with different frequencies. This two-wave mixing FBGs can sense deformations either in the pier structure and/or within the soil (sediment) river bed due to its unique ability to discern different range of frequencies.
    Project Amount
    $ 103,976