| Issue |
MATEC Web of Conferences
Volume 24, 2015
EVACES’15, 6th International Conference on Experimental Vibration Analysis for Civil Engineering Structures
|
|
|---|---|---|
| Article Number | 04002 | |
| Number of page(s) | 8 | |
| Section | Structural monitoring | |
| DOI | https://doi.org/10.1051/matecconf/20152404002 | |
| Published online | 19 October 2015 | |
Modal parameters identification and monitoring of two arches
Politecnico di Milano, Department of Mechanical Engineering, 20156, Milano, Italy
a Corresponding author: sara.muggiasca@polimi.it
The paper presents the results of the modal parameters identification and of the continuous monitoring of two arches built in the new area of Expo 2015 in Milan. The activities on the arches were performed during the erection stage and they were planned as a consequence of preliminary studies performed at Politecnico di Milano wind tunnel, that highlighted dynamic instability due to the wind. In particular, the first two bending modes of the structures showed a critical behaviour and for this reason a TMD (Tuned Mass Damping) system was designed in order to control these modes. At first, frequencies, damping and modal deflected shapes were evaluated in order to check the numerical FEM model, to tune the TMD system and to check its correct functioning. The two arches were then monitored for several months to observe their dynamic behaviour under different wind conditions. A good database about the strongest and the most frequent winds in the site was obtained. The accelerations registered under strong wind conditions did not reach dangerous levels for the structures, moreover these results showed a good agreement with the wind tunnel ones.
© 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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