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Smart Polymer Composite Deck Monitoring Using Distributed High Definition and Bragg Grating Fiber Optic Sensing.

Stephen Young1, Dayakar Penumadu1, Andrew D Patchen1

  • 1Tickle College of Engineering, The University of Tennessee, Knoxville, TN 37996, USA.

Sensors (Basel, Switzerland)
|June 10, 2022
PubMed
Summary

This study introduces a novel fiber optic sensing approach for monitoring composite bridge decks, combining high-resolution strain mapping with dynamic load response for enhanced structural health assessment.

Keywords:
distributed fiber optic sensingfiber Bragg grating sensingrural bridgesstructural health

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Structural Health Monitoring

Background:

  • Fiber-reinforced polymer composites offer superior properties for bridge decks, including durability and corrosion resistance.
  • Existing structural health monitoring methods for bridges, like Brillouin scattering, may lack the spatial resolution for critical event detection.
  • Simultaneous monitoring of static and dynamic loads on composite bridges requires advanced sensing technologies.

Purpose of the Study:

  • To develop and implement a novel sensing system for comprehensive structural health monitoring of composite bridge decks.
  • To simultaneously assess static and dynamic responses, including strain distribution and deformation, under various loading conditions.
  • To integrate multiple sensor technologies for high-fidelity, real-time bridge condition assessment.

Main Methods:

  • Employed a hybrid sensing approach using optical frequency domain reflectometry (OFDR) for high-spatial-resolution strain mapping and fiber Bragg grating (FBG) sensors for dynamic load monitoring.
  • Strategically embedded OFDR sensors to measure strain in longitudinal, transverse, and diagonal directions.
  • Integrated a wireless sensor package for environmental monitoring (temperature) and a triaxial accelerometer for parallel dynamic load data acquisition.

Main Results:

  • OFDR sensors provided high spatial strain resolution, mapping stress distributions across the composite bridge deck.
  • FBG sensors effectively captured dynamic responses to vehicular loading and simulated crash events.
  • Correlated mid-point displacements with strain distribution data from fiber optic sensors, validating the monitoring system's performance.

Conclusions:

  • The integrated OFDR and FBG sensing system offers a robust solution for comprehensive structural health monitoring of composite bridge decks.
  • This novel approach enables simultaneous assessment of static and dynamic behaviors, improving damage detection capabilities and long-term durability assessment.
  • The findings support the use of advanced fiber optic sensing for ensuring the safety and longevity of composite bridge infrastructure.