EXPERIMENTAL AND NUMERICAL DYNAMIC ANALYSIS OF A LONG SPAN PEDESTRIAN BRIGDE UNDER HUMAN WALKING
Filipe Almeida Rezende1; Wendell Diniz Varela2; André Maués Brabo Pereira1; Eliane Maria Lopes Carvalho1
1 Universidade Federal Fluminense; 2 Universidade Federal do Rio de Janeiro
doi:10.20906/CPS/CILAMCE2017-0193
Resumo
Pedestrian bridges are very common in urban areas. Frequently they are light structures with low stiffness due to their long spans. The actual tendency of innovative structures´ conceptions associated with the development of new and high performance materials caused an increase in the number of cases of vibrations problems related to the resonance or quasi resonance of the typical walking frequencies with the fundamental frequencies of the structures of the pedestrian bridges. International design guides already considers human walking as dynamic loading by using Fourier series to represent it. However, in recent researches it has been demonstrated the important role of the human-structure interaction in dynamic responses of very light structures. In this way, the present paper aims the study of the dynamic models used to simulating human walking loading with Fourier series and biodynamic models, trying to evaluate the relevance of the human-structure interaction in dynamic responses of the structure, particularly pedestrian bridges. These models were applied to a planar model of a real pedestrian bridge located in Rio de Janeiro, which presents excessive vibration problems. The dynamic properties used in the planar model were obtained from a 3D FEM numerical model of the structure. The numeric results obtained for both of the human walking numerical models and the 3D FEM of the structure of the pedestrian bridge were correlated to the signals acquired in experimental free and forced vibration tests performed on site. An human comfort analysis was also performed based in international design guidelines. The comparison of the numeric and experimental dynamic responses of the acceleration amplitudes of the pedestrian bridge with four persons walking on it demonstrated the importance of the human-structure interaction in dynamic analysis of light pedestrian bridges.
Palavras-chave: Structural Dynamics; Pedestrian Bridges; Human-Structure Interaction; Biodynamic Models