Abstract
Purpose
In the assessment of footbridge lateral vibrations, the modeling of human-structure interaction requires representation of the dynamics of the human body and the forces induced by people walking, and additionally, consideration of the effects of the crowd. This way, this paper presents a single degree of freedom biodynamic model to represent the action of a walking pedestrian in the lateral direction.
Methods
The biodynamic parameters of mass, stiffness and damping, as well as the dynamic load factor were determined from the measured acceleration of people's center of mass. Before the identification of the parameters in the lateral direction, an initial experimental campaign was carried out to identify and characterize the corporal movements of the pedestrians, define a procedure to process the acquired signals and observe the effect of the crowd on such corporal movements, specifically on acceleration and rotation of the pedestrian's pelvis. A second campaign was carried with people walking alone and later in crowd. In the first stage, each participant walked alone with their normal (free) pacing frequency and metronome-controlled pacing frequencies. Subsequently, each individual walked in group with two crowd density conditions.
Results
Comparison between biodynamic parameters of people walking individually and in a crowd allowed the identification of the influence caused by the crowd. Also, regression expressions were obtained by relating the biodynamic parameters to the walking lateral frequency and body mass of the pedestrian, for both free walking and walking in crowd conditions.
Conclusion
The values of the parameters obtained and the regressions expressions of the biodynamic model in the lateral direction can be used in the study of the human-structure interaction in footbridges.
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Data Availability
All data are fully available on request.
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The authors acknowledge the financial support of CAPES-Brazil and CNPQ-Brazil to carry out this research project.
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The research leading to these results received funding from CAPES-Brazil and CNPQ-Brazil.
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Pena, A.N.P., de Brito, J.L.V., da Silva, F.F.G. et al. Pedestrian Biodynamic Model for Vibration Serviceability of Footbridges in Lateral Direction. J. Vib. Eng. Technol. 9, 1223–1237 (2021). https://doi.org/10.1007/s42417-021-00292-z
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DOI: https://doi.org/10.1007/s42417-021-00292-z