Investigation on Galloping Instability of Inclined Stay-Cables Based On Unsteady Aerodynamic Force and Flow Field

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Other Title
  • 非定常空気力と流れ場に基づいた斜張橋傾斜ケーブルのギャロピング発生機構に関する研究

Abstract

Dry-state galloping of inclined stay-cables occurs under dry surface condition of cables and its mechanisms have been explained by Reynolds number, axial flow and so on, which may be related to Kármán vortex mitigation. To investigate the mechanisms of this galloping, wind tunnel tests with a cable model, which surface roughness was increased to enhance its galloping instability, were conducted. Unsteady aerodynamic forces of the model and flow fields around the body were measured and compared with those for a smooth surface cable. Then, it becomes clear that the aerodynamic properties of dry-state galloping, such as onset wind velocity, seem to be controlled by reduced wind velocity. However, the most important fact is that the stay-cable must be under the situation of critical Reynolds number range, where the Kármán vortex is strongly mitigated. Also, it is concluded that the axial flow has effects to reduce the Kármán vortex, but it may be not direct generation factor of the galloping. Furthermore, to understand this phenomenon in the two dimensional plane as elliptical cross-sections was tried in this study.

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Details 詳細情報について

  • CRID
    1390001205593716480
  • NII Article ID
    130004644491
  • DOI
    10.14887/kazekosymp.22.0.257.0
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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