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A local flexibility method for vibration-based damage localization and quantification
A method for vibration-based damage localization and quantification based on quasistatic flexibility is presented. The experimentally determined flexibility matrix is combined with a virtual load that causes nonzero stresses in a small part of the structure where a possible local stiffness change is investigated. It is shown that, if the strain-stress relationship for the load is proportional, the ratio of some combination of deformations before and after a stiffness change has occurred, equals the inverse local stiffness ratio. The method is therefore called local flexibility (LF) method. Since the quasi-static flexibility matrix can be composed directly from modal parameters the LF method allows to determine local stiffness variations directly from measured modal parameters, even if they are determined from output-only data. Although the LF method is in principle generally applicable, the emphasis in this paper is on beam structures. The method is validated with simulation examples of damaged isostatic and hyperstatic beams, and experiments involving a reinforced concrete free-free beam and a three-span prestressed concrete bridge, that are both subjected to a progressive damage test.
A local flexibility method for vibration-based damage localization and quantification
A method for vibration-based damage localization and quantification based on quasistatic flexibility is presented. The experimentally determined flexibility matrix is combined with a virtual load that causes nonzero stresses in a small part of the structure where a possible local stiffness change is investigated. It is shown that, if the strain-stress relationship for the load is proportional, the ratio of some combination of deformations before and after a stiffness change has occurred, equals the inverse local stiffness ratio. The method is therefore called local flexibility (LF) method. Since the quasi-static flexibility matrix can be composed directly from modal parameters the LF method allows to determine local stiffness variations directly from measured modal parameters, even if they are determined from output-only data. Although the LF method is in principle generally applicable, the emphasis in this paper is on beam structures. The method is validated with simulation examples of damaged isostatic and hyperstatic beams, and experiments involving a reinforced concrete free-free beam and a three-span prestressed concrete bridge, that are both subjected to a progressive damage test.
A local flexibility method for vibration-based damage localization and quantification
Eine örtliche Flexibilitätsmethode für schwingungsbasierte Schadenslokalisierung und -quantifizierung
Reynders, Edwin (author) / Roeck, Guido De (author)
Journal of Sound and Vibration ; 329 ; 2367-2383
2010
17 Seiten, 21 Bilder, 3 Tabellen, 38 Quellen
Article (Journal)
English
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