Vibration based structural health monitoring of an arch bridge: From automated OMA to damage detection

• Type: Article in International Scientific Journal
• Date: 2012

Authors

F. Magalhães (Author) FEUP; A. Cunha (Author) FEUP; E. Caetano (Author) FEUP

Journal

Title: Mechanical Systems and Signal Processing

Vol. 28

Pages: 212-228

ISSN: 0888-3270

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 176 Citations

Scopus - 331 Citations

Other information

Authenticus ID: P-002-BRH

DOI: 10.1016/j.ymssp.2011.06.011

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17