Abstract
It has been reported that many telecommunication cables of figure-8 section suffered from operating problems and sometimes even failed because of wind-induced large-amplitude galloping oscillation. In this study three-dimensional figure-8 cable model was tested in the wind tunnel and aeroelastic behavior of the cable was observed in detail. It is found that wind-induced change in the angle of attack of the wind relative to the cable is significant and this is the fundamental cause of galloping. The critical wind speed that triggers galloping and the initial direction of the self-excited cable motion are explained by the Den Hartog's quasi-steady treatment of the aerodynamic force with some modifications. Applicability of 3-dimensional dynamic analysis with quasi-steady wind forces was also discussed.
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