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Vibration-Based Damage Monitoring in Model Plate-Girder Bridges under Uncertain Temperature Conditions  

Park, Jae-Hyung (Department of Ocean Engineering, Pukyong National University)
Hong, Dong-Soo (Department of Ocean Engineering, Pukyong National University)
Cho, Hyun-Man (Department of Ocean Engineering, Pukyong National University)
Kim, Jeong-Tae (Department of Ocean Engineering, Pukyong National University)
Publication Information
Journal of Ocean Engineering and Technology / v.22, no.1, 2008 , pp. 75-82 More about this Journal
Abstract
A vibration-based damage-monitoring scheme is proposed that would generate an alarm showing the occurrence and location of damage under temperature-induced uncertainty conditions. Experiments on a model plate-girder bridge are described, for which a set of modal parameters was measured under uncertain temperature conditions. A damage-alarming model is formulated to statistically identify the occurrence of damage by recognizing the patterns of damage-driven changes in the natural frequencies of the test structure and by distinguishing temperature-induced off-limits. A damage index method based on the concept of modal strain energy is implemented in the test structure to predict the location of damage. In order to adjust for the temperature-induced changes in the natural frequencies that are used for damage detection, a set of empirical frequency correction formulas is analyzed from the relationship between the temperature and frequency ratio.
Keywords
Plate-girder bridges; Temperature effect; Vibration-based; Natural frequency; Damage monitoring;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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