期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 28, 期 -, 页码 212-228出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2011.06.011
关键词
Dynamic monitoring; Operational Modal Analysis; Environmental effects; Damage detection
资金
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BD/24423/2005]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/24423/2005] Funding Source: FCT
In order to evaluate the usefulness of approaches based on modal parameters tracking for structural health monitoring of bridges, in September of 2007, a dynamic monitoring system was installed in a concrete arch bridge at the city of Porto, in Portugal. The implementation of algorithms to perform the continuous on-line identification of modal parameters based on structural responses to ambient excitation (automated Operational Modal Analysis) has permitted to create a very complete database with the time evolution of the bridge modal characteristics during more than 2 years. This paper describes the strategy that was followed to minimize the effects of environmental and operational factors on the bridge natural frequencies, enabling, in a subsequent stage, the identification of structural anomalies. Alternative static and dynamic regression models are tested and complemented by a Principal Components Analysis. Afterwards, the identification of damages is tried with control charts. At the end, it is demonstrated that the adopted processing methodology permits the detection of realistic damage scenarios, associated with frequency shifts around 0.2%, which were simulated with a numerical model. (C) 2011 Elsevier Ltd. All rights reserved.
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