| Issue |
MATEC Web of Conferences
Volume 24, 2015
EVACES’15, 6th International Conference on Experimental Vibration Analysis for Civil Engineering Structures
|
|
|---|---|---|
| Article Number | 05004 | |
| Number of page(s) | 8 | |
| Section | Vibration based structural assessment | |
| DOI | https://doi.org/10.1051/matecconf/20152405004 | |
| Published online | 19 October 2015 | |
Static and dynamic testing of a damaged post tensioned concrete beam
1 Politecnico di Milano, Department of Architecture, Built Environment and Construction Engineering, Milano, Italy
2 Université Paris-Est, IFSTTAR , Marne La Vallee, France
3 ADVITAM, VINCI, France
4 NECS, France
5 Université LUNAM, IFSTTAR, Nantes, France
a Corresponding author: mariagiuseppina.limongelli@polimi.it
In this paper are reported the results of an experimental campaign carried out on a post tensioned concrete beam with the aim of investigating the possibility to detect early warning signs of deterioration basing on static and/or dynamic tests. The beam was tested in several configurations aimed to reproduce several different phases of the ‘life’ of the beam: the original undamaged state, increasing loss of tension in the post tensioning cables, a strengthening intervention carried out by means of a second tension cable, formation of further cracks on the strengthened beam. Responses of the beam were measured by an extensive set of instruments consisting of accelerometers, inclinometers, displacement transducers, strain gauges and optical fibres. The paper discusses the tests program and the dynamic characterization of the beam in the different damage scenarios. The modal properties of the beam in the different phases were recovered basing on the responses recorded on the beam during sine-sweep and impact hammer tests. The variation of the first modal frequency was studied to investigate the sensitivity of this parameter to both the cracking of the concrete section and the tension in the cables and also to compare results given by different types of experimental tests.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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