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Structural Monitoring of a Large-Span Arch Bridge Using Customized Sensors.

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Summary

This study monitored the Arrábida Bridge using advanced sensors, revealing temperature-induced displacements and dynamic traffic loads in expansion joints. These findings enhance structural health monitoring for bridges.

Keywords:
arch bridgescustomized sensorsoperational modal analysis (OMA)structural health monitoring (SHM)traffic loads and temperature effects on structures

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Area of Science:

  • Civil Engineering
  • Structural Health Monitoring
  • Bridge Engineering

Background:

  • Continuous monitoring of civil structures is crucial.
  • Advancements in measurement systems and sensors offer new possibilities for structural health monitoring (SHM).
  • The Arrábida Bridge, a reinforced concrete arch bridge, serves as a case study.

Purpose of the Study:

  • To implement and evaluate new measurement systems and sensors for SHM of bridges.
  • To identify natural frequencies and vibration modes of the Arrábida Bridge deck.
  • To analyze the correlation between environmental factors, traffic loads, and bridge behavior.

Main Methods:

  • Preliminary ambient vibration tests were conducted on the Arrábida Bridge.
  • Customized sensors, including accelerometers, temperature sensors, and displacement sensors, were deployed.
  • Measurement campaigns were carried out over time to collect data.
  • Signal analysis was performed on the collected data.

Main Results:

  • Distinct temperature variations and phase shifts were observed between deck and arch sections.
  • Temperature measurements accurately estimated displacements in the bridge's expansion joints.
  • Displacements in expansion joints showed both temperature-conditioned and dynamic components from traffic loads.

Conclusions:

  • The study successfully demonstrated the application of new sensor technologies for bridge SHM.
  • Temperature significantly influences expansion joint displacements, but traffic loads also contribute dynamically.
  • The observed dynamic component of displacement offers a novel method for characterizing traffic loads on bridges.