Reference : Some conclusions from the measurements of temperatures and their gradients on eigenfr...
Scientific congresses, symposiums and conference proceedings : Unpublished conference
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/10993/17775
Some conclusions from the measurements of temperatures and their gradients on eigenfrequencies of bridges
English
Mahowald, Jean mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Maas, Stefan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Nguyen, Viet Ha mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Waldmann, Danièle mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Zuerbes, Arno mailto []
30-Jun-2014
5
http://paginas.fe.up.pt/~eurodyn2014/general/welcome/
Yes
International
Eurodyn 2014
30-06-2014 to 2-07-2014
University of Porto, Faculty of Engineering, FEUP
Porto
Portugal
[en] Structuarl Dynamics ; Structural Health Monitoring ; System identification
[en] The ambient air temperature and solar radiation are affecting the soil and asphalts’ stiffness and hence the eigenfrequencies of a bridge. Very often eigenfrequencies are automatically determined by special algorithms from structural response data generated by ambient excitation and measured by permanently installed sensors that is sometimes called “output only analysis” or “operating modal analysis”. Additionally the ambient air temperature is registered and finally the eigenfrequencies are analyzed versus the air temperature. The graph is normally a scatter diagram and each point is one measurement. In general the eigenfrequencies decrease with increasing temperature, whereas often linear regression is used to determine the line of best fit. But the slope of this straight line and the width of the scatter around the regression line differ from bridge to bridge. Especially this scatter field around the mean value at a determined temperature complicates the detection of damage, which is also often based on eigenfrequencies’ reduction. Hence the difficulty among others consists in separating damage from environmental effects.
http://hdl.handle.net/10993/17775

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