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Characterization of bridge nonstationary modal interaction Considering Bearing deterioration

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Document pages: 8 pages

Abstract: With the aging of all bridges, the health monitoring of these structures becomes very important for damage identification and maintenance. Evaluating the health of bridges requires testing various physical quantities, including bridge dynamic response and evaluating the functions of various bridge subsystems. In this study, the deck acceleration and bearing dynamic rotation angle of a long-span steel beam bridge under vehicle excitation were measured. Nonstationary dynamic phenomena including mode interaction and coupling are observed in the response spectrum. In order to explain this phenomenon, the linear vibration modal characteristics of the bridge adopt Fnite element analysis and are correlated with the specific modes in test. A theoretical model is presented showing the mechanism of the mode coupling and instability originated from the friction effects in bearing. This study offers some insights into the correlation between complex bridge vibrations and the bearing effects, which lays a foundation for the in situ health monitoring of bridge bearing by using dynamical testing.

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