ANALYSIS OF VERTICAL LOADS INDUCED BY PEDESTRIANS ON FOOTBRIDGES THROUGH BIODYNAMIC MODELS
Dianelys Vega Ruiz1; Ney Roitman1; Carlos Magluta1
1 Federal University of Rio de Janeiro
doi:10.20906/CPS/CILAMCE2017-0384
Resumo
The simulation of the loads induced by walking people in civil engineering structures is still challenging, being the focus of considerable research worldwide in the recent decades due to the increasing number of reported vibration problems in pedestrian structures. Because of the complexity of the pedestrian mechanisms involved in these problems, there are still some gaps in knowledge and more reliable pedestrian models are needed to be investigated. One of the most important key in the designing of slender structures is the Human-Structure Interaction (HSI). How moving people interact with the structures and affects their dynamical properties are questions not even well understood. In this direction, several authors have proposed biomechanical models to represent the pedestrian, however, which of these models provides a consistent approximation to physical reality still needs to be studied. This paper presents a bi-dimensional bipedal pedestrian walking model based on a model proposed by other authors, in which the human body is represented as a lumped mass at its center of mass and two compliant and massless legs with linear springs and time variant damper. The equations of motion of the human-structure system were coupled in terms of the interacting force at the contact point and the numerical model was implemented in MATLAB. The preliminary results obtained are presented in order to validate the model with experimental results that were carried out in a prototype footbridge in the structures Laboratory of COPPE at Federal University of Rio de Janeiro, where pedestrian were asked to walk on the footbridge and the structural response in the vertical direction was recorded with accelerometers placed at strategic points of the structure.
Palavras-chave: human-structure Interaction; vertical vibrations; biodynamic models; pedestrian loads