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Adesua, Olumide; Ruiz-Teran, Ana M. (2010)
Languages: English
Types: Unknown
In recent years, the new trends in the construction of footbridges have led to the design of innovative bridge types, such as under-deck cable-stayed bridges, with slender and lighter decks. This tendency has made the serviceability limit state of vibrations relevant in the design of footbridges. The natural frequencies of these bridge types, in many occasions, fall within the range of the frequencies of the dynamic forces induced by pedestrians. Therefore, the accelerations induced by pedestrian transit are not admissible when the users‘ comfort has to be guaranteed. In this paper, the dynamical behaviour of an under-deck cable-stayed footbridge under pedestrian action is presented. Both vertical and lateral components of the pedestrian action have been considered. For the analysis of the vertical component, the under-deck cable-stayed footbridge is loaded with groups of pedestrians moving across the footbridge with two different velocities. For the analysis of the lateral component, the frequencies of the lateral forces induced by the pedestrians are taken from the range 0.7-1.2Hz. (Bachmann, 2002). The verification criteria for the serviceability limit state of vibrations established by Eurocode are considered, and the response of the under-deck cable-stayed footbridge was compare with these design standards.Results of the analyses carried out shows the acceleration values of the footbridge in both horizontal and vertical direction. The important of the application of a bracing system on the horizontal acceleration due to laterally induced pedestrians‘ action. The effect of density on the vertical and horizontal acceleration values of the footbridge due to induced pedestrians‘ action. Finally, the result of the effect of speed and different phase time in the induced pedestrians‘ action is shown.

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