Learning from the Genoa bridge collapse
The assessment of the dynamic behaviour of railway bridges often shows a marked difference between theoretical calculated behaviour and that measured by inspection. Typically, this would be in the form of lower measured natural frequencies than calculated by the structural analysis. This is often attributed to additional stiffness provided by the ballast and the track that are usually not included in the strength model.
Increased stiffness would generally lead to higher natural frequencies, and high mass to lower natural frequencies. Perhaps there is a typo in the above paragraph?
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