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Comparison of vertical bridge acceleration according to UK NA 1992-1 and annex b to EN 1995-2

Researchers have known of the problem of the evaluation of the dynamic response of footbridges due to pedestrian loading more than a century ago, but it has been intensively explored over the past 20 years. Footbridges made of modern lightweight materials as well as extreme slender footbridges made of traditional materials often experience excessive vibrations unpleasant for pedestrians. Although an incredibly large amount of research has emerged on the topic, the problem of vibrations is very poorly represented in European standards for structural design (Eurocodes). The requirement for verification of pedestrian comfort criteria may be found in EN 1990 and EN 1991-2. The recommended maximum acceleration of any part of the bridge deck is defined in EN 1990. Unfortunately, the dynamic load models of pedestrian loads are not given in any part of Eurocode. Only the Annex B to Eurocode EN 1995- 2:2013: Design of timber structures gives expressions to determine the vertical and horizontal acceleration of the timber bridges with simply supported beams or truss systems. Also, the UK National Annex to Eurocode EN 1991-2:2003: Actions on structures gives models of pedestrian loads, using which is possible to calculate the vertical acceleration of the bridge. In this paper, the calculations of maximum vertical acceleration on two fictional pedestrian bridges are made according to Annex B to Eurocode EN 1995- 2:2013 and UK National Annex to Eurocode EN 1991- 2:2003 (two different Annexes to European standards). The results of the calculations are presented and compared.

bridge vibration, acceleration, UK NA 1992-1, Annex B to EN 1995-2

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