title: Monitoring stress changes in a concrete bridge with coda wave interferometry.
abstract: Coda wave interferometry is a recent analysis method now widely used in seismology. It uses the increased sensitivity of multiply scattered elastic waves with long travel-times for monitoring weak changes in a medium. While its application for structural monitoring has been shown to work under laboratory conditions, the usability on a real structure with known material changes had yet to be proven. This article presents experiments on a concrete bridge during construction. The results show that small velocity perturbations induced by a changing stress state in the structure can be determined even under adverse conditions. Theoretical estimations based on the stress calculations by the structural engineers are in good agreement with the measured velocity variations.
authors.affiliation: Institut für Geophysik und Geologie, Universität Leipzig, Talstraße 35, 04109 Leipzig, Germany. staehler@geophysik.uni-muenchen.de
authors.forename: Simon Christian
authors.initials: SC
authors.lastname: Stähler
authors.forename: Christoph
authors.initials: C
authors.lastname: Sens-Schönfelder
authors.forename: Ernst
authors.initials: E
authors.lastname: Niederleithinger
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003252:Construction Materials; D004548:Elasticity; D011827:Radiation; D012449:Safety; D013314:Stress, Mechanical; D055883:Structure Collapse / Q000517:prevention & control*; D014732:Vibration