Abstract Summary
This work addresses the experimental studies developed on a 61m-long stress-ribbon footbridge with fundamental frequencies in the vicinity of regular human-induced excitation, which undergoes significant vibrations when crossed by pedestrians matching a pace around 2 Hz. Past research has shown that the bridge has a complex dynamic behaviour, with a relevant non-linear component, high sensitivity of properties to the construction procedure, and high modal interaction in the frequency range of excitation. Having monitored the dynamic behaviour of the footbridge for several years, this paper summarises the evolution of dynamic properties, namely natural frequencies, vibration modes and damping ratios, and investigates their correlation with temperature and amplitude of vibration.
