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

불확실한 온도 조건하의 모형 강 판형교의 진동기반 손상 모니터링

  • 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)
  • Published : 2008.02.28

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

References

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