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Experimental identification of the lateral human–structure interaction mechanism and assessment of the inverted-pendulum biomechanical model

Carroll, Seán P.; Owen, John S.; Hussein, Mohammed F.M.

Authors

Seán P. Carroll sean.carroll@nottingham.ac.uk

Mohammed F.M. Hussein



Abstract

Within the context of crowd-induced lateral bridge vibration, human–structure interaction (HSI) is a widely studied phenomenon. Central to this study is the self-excited component of the ground reaction force (GRF). This force harmonic, induced by a walking pedestrian, resonates with lateral deck motion, irrespective of the pedestrian׳s pacing frequency. Its presence can lead to positive feedback between pedestrian GRFs and structural motion. Characterisation of the self-excited force as equivalent structural mass and damping has greatly improved the understanding of HSI and its role in developing lateral dynamic instability. However, despite this evolving understanding, a key question has remained unanswered; what are the features of a pedestrian׳s balance response to base motion that gives rise to the self-excited force? The majority of the literature has focussed on the effects of HSI with the underlying mechanism receiving comparatively little attention. This paper presents data from experimental testing in which 10 subjects walked individually on a laterally oscillating treadmill. Lateral deck motion as well as the GRFs imposed by the subject was recorded. Three-dimensional motion capture equipment was used to track the position of visual markers mounted on the subject. Thus whole body response to base motion was captured in addition to the GRFs generated. The data presented herein supports the authors’ previous findings that the self-excited force is a frequency sideband harmonic resulting from amplitude modulation of the lateral GRF. The gait behaviour responsible for this amplitude modulation is a periodic modulation of stride width in response to a sinusoidally varying inertia force induced by deck motion. In a separate analysis the validity of the passive inverted pendulum model, stabilised by active control of support placement was confirmed. This was established through comparison of simulated and observed frontal plane CoM motion. Despite the relative simplicity of this biomechanical model, remarkable agreement was observed.

Journal Article Type Article
Publication Date Oct 27, 2014
Journal Journal of Sound and Vibration
Print ISSN 0022-460X
Electronic ISSN 0022-460X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 333
Issue 22
APA6 Citation Carroll, S. P., Owen, J. S., & Hussein, M. F. (2014). Experimental identification of the lateral human–structure interaction mechanism and assessment of the inverted-pendulum biomechanical model. Journal of Sound and Vibration, 333(22), https://doi.org/10.1016/j.jsv.2014.06.022
DOI https://doi.org/10.1016/j.jsv.2014.06.022
Publisher URL http://www.sciencedirect.com/science/article/pii/S0022460X14005070
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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