Damage Identification Using Modal Data: Experiences on a Prestressed Concrete Bridge
Large scale tests with progressive damage on a prestressed concrete highway bridge have been performed to investigate the sensitivity of several damage detection, localization, and quantification methods based on modal parameters. To investigate the quality of modal parameters, the data set of one damage step was analyzed by several output-only identification techniques. Although the bridge was severely cracked, natural frequencies as well as mode shapes display only minor changes. However, the relative changes of mode shapes are larger than those observed for natural frequencies. A novel damage indicator, called mode shape area index, based on changes of mode shapes, has been developed and found as the most sensitive damage detection approach. Damage detection or localization via changes of the flexibility matrix performed better than natural frequencies or mode shapes alone. The application of the direct stiffness calculation and a sensitivity-based model update technique showed results having a high level of ambiguity about the location and quantification of damage also at the highest damage level. Evaluating the information collected in this study the test results indicate that an early stage damage identification in prestressed concrete bridges is hardly possible because of the nearly complete recovery of stiffness after closing of cracks
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/07339445
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Authors:
- Huth, Olaf
- Feltrin, Glauco
- Maeck, Johan
- Kilic, Nedim
- Motavalli, Masoud
- Publication Date: 2005-12
Language
- English
Media Info
- Media Type: Print
- Features: Figures; Illustrations; Photos; References; Tables;
- Pagination: pp 1898-1910
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Serial:
- Journal of Structural Engineering
- Volume: 131
- Issue Number: 12
- Publisher: American Society of Civil Engineers
- ISSN: 0733-9445
- Serial URL: http://ascelibrary.org/loi/jsendh
Subject/Index Terms
- TRT Terms: Cracking; Flexibility; Modal analysis; Natural frequency; Prestressed concrete bridges; Sensitivity analysis; Stiffness; Tests; Vibration
- Uncontrolled Terms: Damage assessment; Mode shapes
- Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 01013403
- Record Type: Publication
- Files: TRIS
- Created Date: Dec 22 2005 10:30AM