ORBi: Canor Thomas - Vandalism Prevention of a Footbridge with Cable Vibrations

Reference : Vandalism Prevention of a Footbridge with Cable Vibrations


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	To cite this reference:	http://hdl.handle.net/2268/108444

Title :	Vandalism Prevention of a Footbridge with Cable Vibrations
Language :	English
Author, co-author :	Canor, Thomas [Université de Liège - ULg > Département ArGEnCo > Analyse sous actions aléatoires en génie civil >]
	Kerschen, Gaëtan [Université de Liège - ULg > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
	Denoël, Vincent [Université de Liège - ULg > Département ArGEnCo > Analyse sous actions aléatoires en génie civil >]
Publication date :	2011
Main document title :	4th International Conference Footbridge : Attractive structures at reasonable costs, Wroclaw 6-8 July 2011
Editor :	Biliszczuk, Jan
	Bien, Jan
	Hawryszkow, Pawel
	Kaminski, Tomasz
Publisher :	DWE
Pages :	1245-1251
On invitation :	No
Audience :	International
ISBN :	978-83-7125-205-1
City :	Wroclaw
Country :	Poland
Event name :	Footbridge 2011
Event date :	du 6 juillet 2011 au 8 juillet 2011
Event organizer :	Wroclaw University of Tehcnology
Event place (city) :	Wroclaw
Event country :	Poland
Keywords :	[en] vandalism ; cable vibrations ; experimental
Abstract :	[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.
Permalink :	http://hdl.handle.net/2268/108444

File(s) associated to this reference

Fulltext file(s):

	File	Commentary	Version	Size	Access
Open access	PAP_Canor_120.pdf		Publisher postprint	1.09 MB	View/Open

All documents in ORBi are protected by a user license.

Dspace v1.5