Static Wind Nonlinear Analysis of Iced Transmission Lines

Abstract

The torsion of iced transmission line under the action of static wind will affect the configuration of its equilibrium state. This state is very critical for occur of the galloping. The beam element simulation method of iced transmission line is proposed. The stiffness matrix and mass matrix are derived, and the double nonlinear analysis method considering geometric nonlinearity and material nonlinearity is proposed. The static wind stability analysis of iced transmission line show that the aerodynamic nonlinearity caused by the shape is obvious. With the increase of wind loads, the torsion angle of conductor increases and the three component force coefficient changes, which leads to the nonlinear change of displacement and internal force response. At low wind speed, the iced conductor is more sensitive to the initial attack angle of wind, but at high wind speed, the conductor deformation is not sensitive to the initial attack angle of wind, and both will converge to the positive and negative values respectively.