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Monitoring stress changes in a concrete bridge with coda wave interferometry.

Simon Christian Stähler¹, Christoph Sens-Schönfelder, Ernst Niederleithinger

¹Institut für Geophysik und Geologie, Universität Leipzig, Talstraße 35, 04109 Leipzig, Germany. staehler@geophysik.uni-muenchen.de

The Journal of the Acoustical Society of America

|April 12, 2011

Summary

Coda wave interferometry successfully monitored a concrete bridge during construction. This seismology technique detected small velocity changes caused by stress, proving its real-world structural monitoring capability.

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Area of Science:

Seismology
Civil Engineering
Materials Science

Background:

Coda wave interferometry (CWI) is a seismological technique utilizing multiply scattered elastic waves.
CWI offers high sensitivity for detecting subtle changes within a medium.
Previous studies demonstrated CWI's effectiveness in laboratory settings for structural monitoring.

Purpose of the Study:

To validate the practical application of coda wave interferometry for real-world structural monitoring.
To assess CWI's capability in detecting material changes under adverse environmental conditions.
To evaluate CWI performance on a concrete bridge during its construction phase.

Main Methods:

Experiments were conducted on a concrete bridge during its construction.
Coda wave interferometry was employed to analyze elastic wave propagation.
Velocity variations were measured and correlated with stress state changes.

Main Results:

The study successfully demonstrated the usability of coda wave interferometry on a real structure.
Small velocity perturbations, indicative of stress state changes, were accurately detected.
Measured velocity variations showed good agreement with theoretical estimations based on structural engineering stress calculations.

Conclusions:

Coda wave interferometry is a viable method for monitoring structural integrity in real-world scenarios.
The technique can effectively detect subtle material changes, such as those induced by stress variations, even in challenging environments.
This research bridges the gap between laboratory findings and practical applications of CWI in civil engineering.