Controle da Resposta Dinâmica de um Passarela de Pedestres da Cidade de Brasília com a Utilização de Amortecedores de Massa Sintonizados / Vibration control of a footbridge in the city of Brasilia using multiple tuned mass dampers (AMSM)

AUTOR(ES)

Daniel Henrique Moreira Gomes

DATA DE PUBLICAÇÃO

2006

RESUMO

Advanced constructive technologies and the use of high resistance materials made possible the design of slender and flexible structures, which present less strength and damping. These structures are more sensitive to vibrations in low frequencies, characteristic of footbridges. The loads produced by human movements, mathematically represented by periodic functions of low frequencies, can cause discomfort to users and safety problems in the structure. Walking and running movement of pedestrians cause dynamic loads generally acting in footbridges. These types of loads have frequency components below 5 Hz. In general it is difficult to prevent that the lowest footbridge frequencies get out of this interval, therefore the strength increase demands structure mass increase, which may be economically prohibitive. Structural control can be a solution to this problem. In this work a footbridge located in the city of Brasilia was studied through a numerical analysis of its dynamic behavior, when submitted to the human walking and running. The dynamic forced vibration analysis for typical human loads showed that the footbridge presents excessive vibrations and that the literature serviceability limits are not verified in many cases. The need of a control system in the footbridge was then confirmed. This system was designed through numerical simulations with different multiple tuned mass damper (MTMD) configurations, besides the introduction of iron bars to increase the structure strength. The obtained results have been considered satisfactory, with reduction in the vibration amplitude of the structure to the acceptable levels in accordance with the serviceability limits of literature.

ASSUNTO(S)

structural dynamics dinâmica estrutural tuned mass damper (tmd) footbridge vibrations estruturas construção civil structural control

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