MADERAS: Ciencia y Tecnología

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Title Evaluating vibrations on a small-scale model of a timber footbridge
Author Antonio Alves Dias, Marcelo Rodrigo Carreira, Pedro Gutemberg de Alcantara Segundinho
Abstract In Brazil, the study of pedestrian-induced vibration on footbridges has been undertaken since the early 1990s, for concrete and steel footbridges. However, there are no recorded studies of this kind for timber footbridges. Brazilian code ABNT NBR 7190 (1997) gives design requirements only for static loads in the case of timber footbridges, without considering the serviceability limit state from pedestrian-induced vibrations. The aim of this work is to perform a theoretical dynamic, numerical and experimental analysis on simply-supported timber footbridges, by using a small-scale model developed from a 24 m span and 2 m width timber footbridge, with two main timber beams. Span and width were scaled down (1:4) to 6 m e 0.5 m, respectively. Among the conclusions reached herein, it is emphasized that the Euler-Bernoulli beam theory is suitable for calculating the vertical and lateral first natural frequencies in simply-supported timber footbridges; however, special attention should be given to the evaluation of lateral bending stiffness, as it leads to conservative values.
Citation
References
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ABNT. 1997. Associação Brasileira de Normas Técnicas. NBR 7190, Projeto de Estruturas de Madeira, Rio de Janeiro, Brasil. 107p.
BS 5400. 1978. Steel, Concrete and Composite Bridges—Part 2: Specification for Loads. Appendix C: Vibration Serviceability Requirements for Foot and Cycle Track Bridges. British Standards Association, London, U.K. 46p.
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Keywords Timber footbridges; pedestrian-induced vibrations; serviceability limit state; small-scale model
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