Shock and Vibration

Shock and Vibration / 2005 / Article

Open Access

Volume 12 |Article ID 857247 | https://doi.org/10.1155/2005/857247

James Mark William Brownjohn, Tao Neng Fu, "Vibration Excitation and Control of a Pedestrian Walkway by Individuals and Crowds", Shock and Vibration, vol. 12, Article ID 857247, 15 pages, 2005. https://doi.org/10.1155/2005/857247

Vibration Excitation and Control of a Pedestrian Walkway by Individuals and Crowds

Received24 Sep 2004
Revised18 Jan 2005

Abstract

As part of a continuing study on effects of humans on loading and dynamic response of footbridges, a steel frame walkway has been the subject of studies on the effects of multiple pedestrians with respect to loading and response mitigation. Following finite element modeling and experimental modal analysis to identify the low frequency vibration modes likely to be excited by normal walking, the variation of response with pedestrian density and of system damping and natural frequency with occupancy by stationary pedestrians were both studied. The potentially mitigating effect of stationary occupants is still not well understood and the study included direct measurement of damping forces and absorbed energy using a force plate. The various tests showed that energy dissipation measured directly was consistent with the observed change in damping, that vertical and lateral response both varied approximately with square root of number of pedestrians, and that the simple model of a human as a single mass-spring-damper system may need to be refined to fit observed changes in modal parameters with a crowd of humans present. Modal parameter changes with moving pedestrians were small compared to those with stationary pedestrians indicating that within limits, modal parameters for the empty structure could be used in analysis.

Copyright © 2005 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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