Numerical analysis of the dynamic behavior of cables under turbulent wind

The research deals with the non-linear dynamic response of cables under steady and turbulent wind. A numerical procedure is described, which fully accounts for geometric and aerodynamic non linearities. In the procedure, the cable is modeled using 3 nodes isoparametric finite elements. The aerodynamic forces are introduced according to the quasi-steady approach, retaining the complete non-linear form of drag and lift components. The methodology is applied to the oscillations of an iced cable in 1 : 2 internal resonance, subjected to a stationary wind flow as well as to a multi-correlated turbulent wind field. For the stationary case the numerical results are compared with those obtained by other researchers using an analytical model. The analysis of time-histories allows for some interesting considerations on the occurrence of self-excited oscillations and on effect of the turbulence structure on the cable response