Abstract
To investigate the basic characteristics of the galloping amplitude of a four-bundled conductor with ice and snow accretion, the authors conducted a time-history analysis in a vertical 1DOF single-mass system. The steady-state oscillation amplitude generated through the galloping depends on the initial vibration. The range of torsional angle where the galloping occurs is wider in a case with an initial vibration than in that without such a vibration, and the largest amplitude is not observed when the torsional angle is that in which the value of the Den Hartog criterion is negative. To clarify the factors of an exciting force during a steady-state oscillation, work done by fluctuating lift force are then analyzed. The results indicate that galloping occurs when the torsional angle is larger than the stall angle, and the relative angle of attack includes a stall angle in which a large lift force acts on the section.
