Atualização da modelagem de uma passarela de pedestres e avaliação do seu desempenho dinâmico

Abstract

Loadings in special systems, such as footbridges, are characterized by low frequencies that can be close to the natural frequencies of the structure, generating discomfort and safety risk for users. Sensitivity to vibrations at low frequencies contributes to the need of studying the dynamic behavior of these structural systems in order to perform satisfactorily. The work consists of the updating and dynamic analysis of the numerical model, in finite elements, of a footbridge located in the city of João Pessoa, using simulations with some loading scenarios estimated from standards so as to evaluate the dynamic structural performance using the ANSYS 14.5 software. In order to compare the results of the analysis in the model, normative limits and the natural experimental frequencies of the structure obtained in previous tests with accelerometers were used. From the obtained results it was possible to verify that the model represents the structure well, presenting vibration frequencies in the vertical and lateral direction close to those identified experimentally. As for the simulation results, it was verified that the footbridge does not present excessive vibrations problems in any of the directions studied for the considered loading scenarios.