Živanović, Stana, Diaz, I.M. and Pavić, Aleksandar (2009) Influence of walking and standing crowds on structural dynamic properties. In: IMAC XXVII Conference & Exposition on Structural Dynamics, Orlando, FL, U.S.A., Feb 9-12, 2009. Published in: Proceedings of the IMAC XXVII

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Abstract

Civil engineering structures that accommodate pedestrians, such as footbridges and floors, could be exposed to excessive vibrations under walking-induced dynamic excitation. Since humans are quite sensitive vibration receivers, this situation leads to pedestrians' interaction with the structure. For laterally moving structure the interaction often forces synchronisation of crowd's walking step with the structural oscillating frequency, leading to a dramatic increase of vibration response; a phenomenon that made the Millennium Bridge in London and Solferino Passerelle in Paris famous, although for unintended reasons. While there is a general understanding that crowd of pedestrians act as negative dampers when walking across laterally moving surface, the interaction of the same crowd with the vertically moving surface is far less understood. This paper aims to shed some light on the latter issue by conducting the modal testing of a footbridge for three different setups: 1) empty structure, 2) bridge occupied by a passive (i.e. standing) crowd and 3) the bridge occupied by an active (i.e. walking) crowd. The dynamic properties of the three systems are then identified and compared. It was found that both crowds increased dampening potential of the structure, with the effect more pronounced for the passive crowd.

Item Type:	Conference Item (Paper)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Proceedings of the IMAC XXVII
Publisher:	The Society for Experimental Mechanics, Inc.
Date:	2009
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Conserjería de Educación y Ciencia of Junta de Comunidades de Castilla-La Mancha, European Social Fund
Grant number:	GR/T03000/01 (EPSRC)
Conference Paper Type:	Paper
Title of Event:	IMAC XXVII Conference & Exposition on Structural Dynamics
Type of Event:	Conference
Location of Event:	Orlando, FL, U.S.A.
Date(s) of Event:	Feb 9-12, 2009
URI:	http://wrap.warwick.ac.uk/id/eprint/46867

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