Journal
ENGINEERING STRUCTURES
Volume 30, Issue 11, Pages 3034-3044Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2008.04.020
Keywords
Ambient vibration test; Dynamic monitoring system; Automatic modal parameters identification; Frequency domain decomposition
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Funding
- Portuguese Foundation for Science and Technology (FCT)
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A new multi-channel dynamic monitoring system was recently installed in a long span concrete arch bridge that crosses the Douro River in the city of Porto, Portugal: the Infante D. Henrique bridge. This paper describes the experimental and numerical studies developed shortly after construction of the characterizes the installed monitoring system and presents the results achieved with the software bridge, developed to process the data that is continuously received through the Internet. Preliminary studies included the development of an ambient vibration test and the construction of a numerical model of the bridge that was tuned to fit the bridge dynamic properties identified by the ambient vibration test. The routines implemented include the on-line automatic identification of the bridge's natural frequencies with the Frequency Domain Decomposition method, enabling the tracking of the bridge's first 12 natural frequencies. This unique feature is only possible due to the combination of high-quality acquisition equipment with state of the art processing algorithms. (C) 2008 Elsevier Ltd. All rights reserved.
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