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Distributed Optical Fiber-Based Approach for Soil-Structure Interaction.

Nissrine Boujia1, Franziska Schmidt1, Christophe Chevalier1

  • 1Université Paris Est, Ifsttar, 77447 Champs sur Marne, France.

Sensors (Basel, Switzerland)
|January 16, 2020
PubMed
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Fiber optic sensors effectively monitor bridge scour, a critical hydraulic risk. Optical frequency domain reflectometry (OFDR) provides accurate, real-time strain measurements for enhanced structural stability assessments.

Area of Science:

  • Civil Engineering
  • Geotechnical Engineering
  • Sensor Technology

Background:

  • Bridge scour poses a significant hydraulic risk to structural stability in various environments.
  • Permanent and real-time monitoring systems are essential for mitigating scour-related failures.
  • Fiber optic sensing offers advanced capabilities for distributed strain measurements.

Purpose of the Study:

  • To evaluate the effectiveness of fiber optic sensors for scour monitoring.
  • To assess the impact of scour on structural elements using distributed strain measurements.
  • To validate sensor accuracy and interpret results through analytical and physical models.

Main Methods:

  • Utilized optical frequency domain reflectometry (OFDR) for distributed strain measurements along a rod.
Keywords:
distributed measurementsequivalent lengthfiber optic sensorsscoursoil-structure interactionwinkler model

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  • Conducted static lateral load tests to simulate scour effects.
  • Developed an analytical model based on the Winkler soil model for data interpretation.
  • Performed dynamic tests and compared results with static tests using an equivalent cantilever model.

    • Main Results:

    • OFDR successfully detected and quantified strain changes induced by simulated scour conditions.
    • The Winkler model provided a reliable framework for evaluating sensor accuracy and interpreting strain data.
    • Comparison between static and dynamic test results offered insights into scour behavior under different loading scenarios.

    Conclusions:

    • Fiber optic sensing, specifically OFDR, presents a promising technique for real-time bridge scour monitoring.
    • The integration of analytical models enhances the interpretation and reliability of sensor-based scour assessments.
    • This approach contributes to improved structural health monitoring and risk management for bridges.