Veering phenomena in cable-stayed bridge dynamics

The analytic results of a simple model of a cable-stayed beam allows one to describe the dynamic characteristics of stayed-structures. The model is used either to evidence the capacity of a newly introduced localization factor to identify local modes involving mainly the cables, and to reveal a veering phenomenon occurring between local and global frequencies. The variation of a mechanical parameter produces a flipping between local/global (cable/beam) modal shapes through a veering region, where hybrid modes born as combination of the involved eigenfunctions. The occurrence of hybrid modes is also captured by the coincidence of the associated localization factors. These dynamical properties opportunely described by the introduced localization factor, have been recognized still valid in a refined finite element model of a cable-stayed bridge