AEROELASTIC PERFORMANCE OF MULTI-STRAND CABLE WITH HORIZONTAL SKEW ANGLE AND EFFECT OF HELICAL STRAND

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  • 水平偏角をつけたマルチストランドケーブルの空力特性およびへリカルストランドの効果

Abstract

The multi-strand cable is proposed because it is economical and it shows good wind-resistant performance under normal wind. In this study, the aeroelastic performance of the multi-strand cable with horizontal skew angle was experimentally investigated, because skew wind usually acts on cables of cable-stayed bridges. In skew wind, the multi-strand cable was less stable than a circular cylinder, partly a due to larger span wise area of exciting aerodynamic force. On the other hand, with application of a helical strand, the multi-strand cable became more stable than a circular cylinder because the damping aerodynamic force acted over most of the area of the span. The effect was caused by changing the sign of the phase between the force displacement and the aerodynamic force. Possible relationship of the axial flow and the observed aerodynamic characteristics are also discussed.

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