NONLINEAR MODEL OF WIND-INDUCED VIBRATIONS OF SLENDER STRUCTURES WITHCIRCULAR CROSS-SECTIONS

In the present paper a numerical model well suited to predict the resp onse of cylindrical slender structures subjected to the wind action is presented. The total longitudinal. and lateral forces acting on this kind of structures are treated as a sum of correlated random forces in the along-wind direction and in the across-wind direction and of dete rministic aerodynamic forces arising from the transversal structural m otion. The proposed model can handle all the velocity components of th e structure, and the related aerodynamic forces are computed even when the structural behaviour is strongly nonlinear due to large displacem ent effects. With reference to some structural typologies relevant to engineering applications (chimneys and cable-stayed chimneys), some nu merical examples are presented in order to show the model functionalit y.