A simplified three-dimensional non-linear discrete model of an iced suspended cable, excited by uniform wind velocity, is developed in quasi-static regime. It includes the whole non-linear effect of torsion, both on the mechanics and on the aerodynamics. By considering single cables for which torsional frequency is much higher than flexural ones, a quasi-static condensation is performed to obtain a model with only two translational degrees of freedom. The influence of torsional stiffness on critical wind speed is analysed, both in near-to-resonance and far-from-resonance conditions between in-plane and out-of-plane oscillations. A preliminary numerical analysis of the post-critical behaviour is performed.
On the influence of the torsional stiffness on non-linear galloping of suspended cables
PICCARDO, GIUSEPPE
1996-01-01
Abstract
A simplified three-dimensional non-linear discrete model of an iced suspended cable, excited by uniform wind velocity, is developed in quasi-static regime. It includes the whole non-linear effect of torsion, both on the mechanics and on the aerodynamics. By considering single cables for which torsional frequency is much higher than flexural ones, a quasi-static condensation is performed to obtain a model with only two translational degrees of freedom. The influence of torsional stiffness on critical wind speed is analysed, both in near-to-resonance and far-from-resonance conditions between in-plane and out-of-plane oscillations. A preliminary numerical analysis of the post-critical behaviour is performed.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
