The excessive lateral sway motion caused by crowds walking across footbridges has attracted great public attention in the past few years. Different possible mechanisms responsible for such lateral vibrations have been investigated in the literature, assuming that synchronization between structural motion and pedestrians occurs. Based on a new forcing model whose amplitude is a function of deck oscillations, a parametric excitation mechanism has been analysed by the authors of the present paper, that can give rise to strong lateral vibrations of flexible footbridges. The proposed forcing model is here validated through recent experimental results. Furthermore, it is applied for the analysis of pedestrianinduced vibrations of a real footbridge when no evidence of synchronization between pedestrians and the footbridge appears.
A loading model for the interpretation of lateral vibrations of flexible footbridges
TUBINO, FEDERICA;PICCARDO, GIUSEPPE
2011-01-01
Abstract
The excessive lateral sway motion caused by crowds walking across footbridges has attracted great public attention in the past few years. Different possible mechanisms responsible for such lateral vibrations have been investigated in the literature, assuming that synchronization between structural motion and pedestrians occurs. Based on a new forcing model whose amplitude is a function of deck oscillations, a parametric excitation mechanism has been analysed by the authors of the present paper, that can give rise to strong lateral vibrations of flexible footbridges. The proposed forcing model is here validated through recent experimental results. Furthermore, it is applied for the analysis of pedestrianinduced vibrations of a real footbridge when no evidence of synchronization between pedestrians and the footbridge appears.
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