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Author(s): Wei-Hua Hu
A. Cardoso
F. Magalhães
E. Caetano
A. Cunha
Title: Temperature effects on modal variability of a stress-ribbon footbridge under operational conditions
Issue Date: 2010
Abstract: This paper reports the environmental effects on modal properties of the stress-ribbon footbridge of FEUPCampus, based on experimental data acquired by a continuous dynamic monitoring system, with remotecontrol through the Internet, working permanently since June 2009, which comprehends a set ofpiezoelectric accelerometers and temperature sensors. A toolkit in LabVIEW environment was developedto process all the data collected by the monitoring system during almost one year, using an automated SSICOVmodal identification method and an algorithm for the evaluation of averaged vibration amplitude. Itis revealed that the natural frequencies are affected by both temperature and vibration amplitude caused bypedestrians. Comparison of modal estimates obtained from ambient vibration tests performed in October2009 and October 2004, as well as the continuous monitoring results demonstrate that these ambienteffects may mask subtle changes caused by possible damage. The application of Principal ComponentAnalysis on the natural frequencies effectively eliminates such effects, enabling the establishment of abaseline to detect possible damage.
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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