Reference : Vandalism Prevention of a Footbridge with Cable Vibrations
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/2268/108444
Vandalism Prevention of a Footbridge with Cable Vibrations
English
Canor, Thomas mailto [Université de Liège - ULg > Département ArGEnCo > Analyse sous actions aléatoires en génie civil >]
Kerschen, Gaëtan mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Denoël, Vincent mailto [Université de Liège - ULg > Département ArGEnCo > Analyse sous actions aléatoires en génie civil >]
2011
4th International Conference Footbridge : Attractive structures at reasonable costs, Wroclaw 6-8 July 2011
Biliszczuk, Jan
Bien, Jan
Hawryszkow, Pawel
Kaminski, Tomasz
DWE
1245-1251
Yes
No
International
978-83-7125-205-1
Wroclaw
Poland
Footbridge 2011
du 6 juillet 2011 au 8 juillet 2011
Wroclaw University of Tehcnology
Wroclaw
Poland
[en] vandalism ; cable vibrations ; experimental
[en] This work studies an unusual way to improve comfort of a footbridge with cables. Cables can be seen as a means
of dissipating energy in a structure. This complementary source of dissipation does not prohibit resonance from
taking place, but it is a way to limit vibrations and to impede vandals’ actions. This study is illustrated with
measurements realized on a specific footbridge. This structure is a metallic arch characterized by a first natural
frequency of 3.2Hz and a corresponding damping ratio of 0.55%. Intolerable accelerations (around 6m/s²) are
easily reached when an ill-intentioned person is bouncing at an appropriate frequency. After installation of a
single cable at a suitable location in the structure, the measured damping ratios are almost doubled and the
maximum accelerations at resonance are reduced by 30%. With three cables on the footbridge, the damping ratio
becomes significantly nonlinear: it reaches up to 3% for low amplitude oscillations, but drops down to 1% for
moderate to high amplitudes. For higher accelerations, it does not seem to depend on the number of cables.
According to these observations, a notable effect of cables is to reduce the maximum acceleration, but the main
effect is to prolong the transient phase and to make the resonance frequency hardly identifiable by vandals.
http://hdl.handle.net/2268/108444

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