Investigation on characteristics and span-wise correlation of vortex-induced forces on a twin-box deck using newly-developed wind-tunnel test technique

Q. Zhu, B. Y. Chen, L. D. Zhu, You Lin Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review


The span-wise correlation of vortex-induced forces (VIFs) should be considered in the prediction of vortex-induced responses. At present, forced-motion tests with pressure measurements are often used to investigate the span-wise correlation of VIFs, but these tests may not be able to truly represent the nonlinear wind-structure interaction in VIV. This paper uses a newly-developed wind tunnel test technique to measure vortex-induced responses and forces at different span-wise locations. This study investigates the frequency-domain characteristics and the span-wise correlation of the VIFs on a twin-box deck under both smooth and turbulent flow fields. The results show that the fundamental- and triple-frequency components of the VIFs play major roles in the VIV. The fundamental-frequency component of the VIFs can be seen as perfectly correlated within the lock-in range under smooth wind flow, even when the structural damping ratio increases from 0.35% to 0.8%. Under turbulent flow field, the correlation decays mildly with the increase of turbulence intensity, but within the lock-in range, the VIF is still well correlated even with a turbulence intensity of 8%.
Original languageEnglish
Pages (from-to)69-81
Number of pages13
JournalJournal of Wind Engineering and Industrial Aerodynamics
Publication statusPublished - 1 May 2017


  • Newly-developed wind tunnel test technique
  • Span-wise correlation
  • Turbulence
  • Twin-box deck
  • Vortex-induced force

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Renewable Energy, Sustainability and the Environment
  • Mechanical Engineering

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