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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 106
PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping and P. Iványi
Paper 115

Improvement of the Dynamic Behaviour of the Varesine-Garibaldi Footbridge in Milan, Italy by using Tuned Mass Dampers

R. Morbin1, F. Faleschini1, M.A. Zanini1, M. Caldon1, F.P. Marchesini1, E. Maiorana2 and C. Pellegrino1

1Department of Civil, Environmental and Architectural Engineering, University of Padova, Italy
2OMBA Impianti & Engineering SpA, Torri di Quartesolo, Italy

Full Bibliographic Reference for this paper
R. Morbin, F. Faleschini, M.A. Zanini, M. Caldon, F.P. Marchesini, E. Maiorana, C. Pellegrino, "Improvement of the Dynamic Behaviour of the Varesine-Garibaldi Footbridge in Milan, Italy by using Tuned Mass Dampers", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 115, 2014. doi:10.4203/ccp.106.115
Keywords: bridge, steel, structural identification, dynamic tests, modal analysis, tuned mass damper..

Summary
This paper presents the results of two dynamic identification research programmes, carried out before and after the installation of a tuned mass damper on the Varesine- Garibaldi footbridge, with the aim of assessing the effectiveness of the intervention. This footbridge is a two-span simply supported steel footbridge sited in close proximity to the Milano Garibaldi railway station. The equipment includes fifteen uni-axial accelerometers, with seventeen channels data acquisition system. Response measurements made on ambient excited-structure were firstly analysed; then, harmonic forced vibration tests with vertical, transversal and longitudinal direction of the excitation were carried out. In addition, free vibrations of the footbridge when subject to different pedestrian loads (pedestrians marching in time or crowd random walking) were processed. The identification procedure is based on modal analysis.

System identification was performed using three different techniques in the frequency domain: frequency domain decomposition, enhanced frequency domain decomposition and poly-reference least square complex frequency domain.

The results show that the proposed control system mitigates vibrations, sensibly reducing the response amplitude during the forced phase. Concerning the comfort and safety of the footbridge, the tuned mass damper system increases the in-service lifetime of the analysed structure and improves the dynamic behaviour of the whole footbridge.

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