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Shock and Vibration
Volume 6, Issue 5-6, Pages 247-251

Significance of Operating Environment in Condition Monitoring of Large Civil Structures

Sreenivas Alampalli

Structures Research, New York State Department of Transportation, 1220 Washington Avenue, Albany, NY 12232-0869, USA

Received 9 November 1998; Revised 10 September 1999

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Success of remote long-term condition monitoring of large civil structures and developing calibrated analytical models for damage detection, depend significantly on establishing accurate baseline signatures and their sensitivity. Most studies reported in the literature concentrated on the effect of structural damage on modal parameters without emphasis on reliability of modal parameters. Thus, a field bridge structure was studied for the significance of operating conditions in relation to baseline signatures. Results indicate that in practice, civil structures should be monitored for at least one full cycle of in-service environmental changes before establishing baselines for condition monitoring or calibrating finite-element models. Boundary conditions deserve special attention.