Reference : Some remarks on the influence of temperature-variations, non-linearities, repeatabili...
Scientific congresses, symposiums and conference proceedings : Paper published in a journal
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/10993/22755
Some remarks on the influence of temperature-variations, non-linearities, repeatability and ageing on modal-analysis for structural health monitoring of real bridges
English
Maas, Stefan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Schommer, Sebastian 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 >]
Mahowald, Jean mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Zürbes, Arno mailto []
19-Oct-2015
MATEC Web of Conferences
EDP Sciences
24
Article No. 05006
Yes
International
2261-236X
Les Ulis
France
EVACES’15, 6th International Conference on Experimental Vibration Analysis for Civil Engineering Structures
19-21 October 2015
EMPA Zürich Switzerland
Dübendorf (Zürich)
Switzerland
[en] structural health monitoring ; temperature influence ; modal analysis
[en] Structural Health Monitoring (SHM) intends to identify damage by changes of characteristics as for instance the modal parameters. The eigenfrequencies, mode-shapes and damping-values are either directly used as damage indicators or the changes of derived parameters are analysed, such as e.g. flexibilities or updated finite element models. One common way is a ontinuous monitoring under environmental excitation forces, such as wind or traffic, i.e. the so-called output-only modal analysis. Alternatively, a forced measured external excitation in distinct time-intervals may be used for input-output modal analysis. Both methods are limited by the precision or the repeatability under real-life conditions at site. The paper will summarize everal field tests of artificially step by step damaged bridges prior to their final demolishment and it will show the changes of eigenfrequencies due to induced artificial damage. Additionally, some results of a monitoring campaign of a healthy bridge in Luxembourg are presented. Reinforced concrete shows non-linear behaviour in the sense that modal parameters depend on the excitation force amplitude, i.e. higher forces lead often to lower eigenfrequencies than smaller forces. Furthermore, the temperature of real bridges is neither constant in space nor in time, while for instance the stiffness of asphalt is strongly dependant on it. Finally, ageing as uch can also change a bridge’s stiffness and its modal parameters, e.g. because creep and hrinkage of concrete or ageing of elastomeric bearing pads influence their modulus of elasticity. These effects cannot be considered as damage, though they influence the measurement of modal parameters and hinder damage detection.
Faculty of Science, Technology and Communication, Engineering Sciences
University of Luxembourg - UL
Researchers ; Professionals ; Students
http://hdl.handle.net/10993/22755
10.1051/matecconf/20152405006
http://www.matec-conferences.org/articles/matecconf/abs/2015/05/matecconf_evaces2015_05006/matecconf_evaces2015_05006.html

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