THE EFFECT OF BENDING STIFFNESS ON AEOLIAN OSCILLATION OF TRANSMISSION LINES

A long span transmission line may be set into the aeolian cross-wind periodic oscillation of a high-frequency, low amplitude by relatively low wind velocity. Based on spatial curved beams interpolation functions and the strain-displacement relations of spatial curved beam theory, the finite element model of the transmission line which have 6 DOF node is proposed. The main aerodynamic properties of wind are described by using the semi experienced model proposed by Scanlan. The damping power of a single-degree of-freedom system is equivalent to modal self-damping. The strip methods are used to formulate the updated Lagrange motion equations, solved by the modal decomposition method. The results of an example show that the aeolian vibration of the transmission line simulated by the curved beam element considering bending stiffness is in good agreement with results solved by 3 a node cable element. But the aeolian vibration amplitude of high frequencies will be underestimated if ignoring the bending stiffness of the conductor.