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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping and P. Iványi
A Probabilistic Approach to Detect Excessive Vibration in Steel-Concrete Composite Footbridges
J.M. Santos de Souza1, J.G. Santos da Silva2, L.F. Costa Neves3 and R.M.M.P. Matos3
1Civil Engineering Post-graduate Programme, State University of Rio de Janeiro, Brazil
J.M. Santos de Souza, J.G. Santos da Silva, L.F. Costa Neves, R.M.M.P. Matos, "A Probabilistic Approach to Detect Excessive Vibration in Steel-Concrete Composite Footbridges", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 13, 2014. doi:10.4203/ccp.106.13
Keywords: steel-concrete composite footbridges, probabilistic approach, structural dynamics, dynamic analysis, excessive vibration, human comfort..
Nowadays, pedestrian footbridges are more and more becoming modern landmarks of urban areas. Designers seem to continuously move the safety border, to increase slenderness and lightness of their structures. On the other hand, pedestrian footbridges are carried out as light weight structures with low frequencies and low damping. These facts have generated very slender footbridges, sensitive to dynamic excitation and consequently changed the serviceability and ultimate limit states associated to their design. Based on this scenario, in this paper a probabilistic approach is developed to allow the structural engineers to assess the variation of the human walking force generated by different pedestrians and their impact on the dynamic response of pedestrian footbridges. The human walking is modelled based on the random nature of the dynamic load induced by different pedestrians. The investigated reference structure is based on a composite footbridge made of steel beams and a reinforced concrete deck and built in the Institute of Traumatology and Orthopaedics (INTO) campus, Rio de Janeiro, Brazil. This probabilistic approach provided a more realistic assessment of the pedestrian footbridges dynamic response and is very useful to detect human-induced excessive vibrations.
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