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Standards guidelines for human comfort tested on timber footbridges

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Author(s): Pedro Gutemberg de Alcântara Segundinho | Antonio Alves Dias | Marcelo Rodrigo Carreira

Journal: Semina : Ciências Exatas e Tecnológicas
ISSN 1676-5451

Volume: 32;
Issue: 1;
Start page: 23;
Date: 2011;
Original page

Keywords: Frequencies | Accelerations | Simply supported footbridges | Human comfort

ABSTRACT
Activities such as walking, running and jumping can produce undesirable dynamic excitations, which are a phenomenon that occurs due to pedestrian-induced dynamic forces whenever a footbridge features a natural frequency within stepping frequency ranges. Dynamic evaluations of timber footbridges are necessary to verify the level of human comfort and the suitability of the bridges when subjected to human traffic. The objective of this paper is to present a bibliography review on the standards guidelines contained in international codes BS 5400, SIA 160, OHBDC, CEB, EUROCODE 5, AASHTO, BRO and ISO 10137 as well as in studies by various researchers, in order to verify the serviceability limit state for vibrations. In Brazil, codes ABNT NBR 7190 and ABNT NBR 7188 set the sizing criteria for timber footbridges considering the ultimate and serviceability limit states, with the latter ignoring human comfort with regard to vibrations. Thus, the information contained in this study can contribute to the refinement of Brazilian code ABNT NBR 7190, as it takes into account human comfort in pedestrian-induced vibrations on footbridges.
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