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Author(s): F. Magalhães
A. Cunha
E. Caetano
Title: Continuous Dynamic Monitoring of an arch bridge: strategy to eliminate the environmental and operational effects and detect damage
Issue Date: 2010
Abstract: A continuous dynamic monitoring system of an arch bridge in operation for more than 2 years haspermitted to create a very complete database with the time evolution of the first 12 natural frequencies ofthe bridge. Firstly, the time evolution of the modal parameters automatically identified from the datacontinuously collected by the monitoring system is used to test alternative static and dynamic regressionmodels for the elimination of environmental and operational effects on the natural frequencies.Afterwards, it is evaluated the ability of Shewhart control charts to detected realistic damages, simulatedwith a numerical model. This statistical tool is applied to the natural frequencies corrected by thepreviously selected dynamic regression model and post-processed by a Principal Components Analysis. Itis demonstrated that with an adequate selection of the control chart parameters, this permits the detectionof very small frequency shifts (few milli-Hz), as the ones due to the four simulated damage scenarios(localized bending stiffness reductions of 10%).
Subject: Outras ciências da engenharia e tecnologias
Other engineering and technologies
Scientific areas: Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias
Engineering and technology::Other engineering and technologies
Source: Int. Conf. on Noise and Vibration Engineering, ISMA'2010
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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