This paper presents the analytical and experimental studies of aeroelastic behaviors of slender structures, particularly of lighting poles and antenna masts with distributed eccentricities. Critical conditions of coupled galloping and of generalized Den Hartog’s criterion are derived in closed form. An application of the method on a real structure indicates the significance of the aerodynamic eccentricities, upper vibration modes, and coupling between the translational components of the motion. Additionally, in case of such a structure, it is pointed out that carrying out the classic simplified SDOF (single degree of freedom) stability analysis may lead to considerable errors in the prediction of instability conditions.
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