Vertical Accelerations due to Joggers of a Short Span Footbridge
|Conference:||Footbridge 2017 Berlin - Tell A Story, 6-8.9.2017, Technische Universität Berlin (TU Berlin)|
|Published in:||Footbridge 2017 Berlin - Tell A Story|
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|