Vertical Accelerations due to Joggers of a Short Span Footbridge

Medium: conference paper
Language(s): en 
Conference: Footbridge 2017 Berlin - Tell A Story, 6-8.9.2017, Technische Universität Berlin (TU Berlin)
Published in:
Year: 2017
DOI: 10.24904/footbridge2017.09424
Abstract: A prescribed approach according to the Eurocode to calculate the expected vertical accelerations of a footbridge due to joggers is to model a harmonic oscillating point load at midspan, representing the joggers, and calculate the outcome of the steady-­state solution. This is true for footbridges with a long span, but when looking at short span footbridges, the steady-­state solution overestimates the occurring vertical accelerations of the footbridge in reality by far. In case of short span footbridges the calculated vertical accelerations during the transient-­state, approaches reality better.

An analytical model is made of a moving harmonic oscillating point load in time, representing a jogger running across a footbridge. The vertical accelerations are calculated at midspan of the footbridge.

The results of the analytical model show good agreement with the results measured at midspan in reality, proving a steady-­state solution overestimates the expected vertical accelerations of a short span footbridge when a jogger runs across the footbridge.

Keywords: footbridge, resonance, vibrations, dynamics, response, vertical accelerations, jogger, running, harmonic, steady state, transient state, slender bridges, short span, moving point load

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