A PARAMETRIC STUDY OF FOOTBRIDGE VERTICAL BENDING RESPONSE CONSIDERING HUMAN-STRUCTURE INTERACTION

Resumo

The effect of human walking in slender footbridges have been experimentally observed by many authors
such as changes in the modal properties of the coupled human-structure system, especially damping ratio, which
is responsible for the attenuation of the structural vibration oscillations. To simulate the pedestrian - structure
dynamic interaction biodynamic models have been used to represent human walking effects (in contrast to the live
load traditional model). The structural response is then governed by the modal parameters of the biodynamic
models in addition to those of the structure itself. This paper presents a parametric study of footbridge vertical
bending response considering the modal properties of a single degree of freedom spring-mass damper biodynamic
model coupled to the structure within a mathematical model of the human-structure interaction. The results
highlight the important role played by the frequency of the biodynamic model in addition to that of the walking
frequency in relation to the frequency of the structure.