Vibration analysis of tubular footbridges induced by human walking

摘要

The main objective of this investigation is to present the finite element modelling of the dynamicrnbehaviour of tubular composite (steel-concrete) footbridges submitted to human walking vibrations. The investigatedrnstructural system was based on a tubular composite (steel-concrete) footbridge, spanning 82.5 m. Thernstructural model consists of tubular steel sections and a concrete slab. This investigation is carried out basedrnon correlations between the experimental results related to the footbridge dynamic response and those obtainedrnwith finite element modelling. The finite element model enabled a complete dynamic evaluation of the tubularrnfootbridge in terms of human comfort and its associated vibration serviceability limit states. The peak accelerationsrnfound in the present analysis indicated that the investigated tubular footbridge presented problems relatedrnwith human comfort. Hence it was detected that this type of structure can reach high vibration levels that canrncompromise the footbridge user’s comfort.