Effect of the relative differences in the natural frequencies of parallel cable-stayed bridges during interactive vortex-induced vibration. Issue 171 (December 2017)

• Record Type: Journal Article
• Authors: Park, Jin; Kim, Ho-Kyung
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 171(2017)
• Page Start: 330
• Page End: 341
• Publication Date: 2017-12
• Subjects: Vortex -- Wind -- Vibration -- VIV -- Cable-stayed bridge -- Bridge -- Parallel -- Frequency -- Wind tunnel test; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2017.10.010
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: This study was focused on the effects of vortex-induced vibration (VIV) in parallel twin cable-stayed bridges. A series of wind tunnel tests were performed to investigate the effect of the relative differences in the setup of the natural frequencies of parallel decks during VIV. The differences in the natural frequencies of the two decks are represented in terms of the frequency ratio (FR) as defined by the ratio of the natural frequency of the upstream deck to that of the downstream deck. Six FRs were examined to cover all the potential ranges of relative differences in the natural frequencies of the two decks. The interactive motions of the two decks were examined with normalization parameters to demonstrate the fundamental mechanics of complicated VIV of parallel twin cable-stayed bridges from the viewpoints of fluid and structural dynamics. Highlights: Vortex-induced vibration (VIV) in parallel twin cable-stayed bridges is investigated. . The effect of the relative differences in natural frequencies during interactive VIV is estimated. . Two-dimensional sectional models were spring-supported in a wind tunnel. . The VIV in the upstream deck remained consistent regardless of changes in the frequency ratios. . The VIV in the downstream deck was affected by the motion-induced vortices of the upstream deck.