Abstract
Although not always resulting in catastrophic failures, vortex-induced vibration (VIV) response can seriously impact the fatigue life and functionality of bridges, especially for separate pairs of box girders in cable-stayed bridges. This study investigates the effects of three aerodynamic measures: grating, inclined web plate, and the baffles on separated box girders in the cable-stayed bridges. The experimental result indicates that the grating of different opening ratios can control the vortex-induced vibration effectively, and the optimized grating opening ratio set in this paper is 40%. Increasing the angle of inclined web plate has a great control on mitigation of the vortex-induced vibration. However, there is an optimum angle where the amplitude of vortex-induced vibration is the smallest at low wind speed. The amplitude of vortex-induced vibration becomes larger with the increase of the web inclined angle that exceeds the optimum angle. Comparatively, the baffles installed on both sides of the inclined webs are more effective to restrain the vortex-induced resonance. The Computational Fluent Dynamics (CFD) software is utilized to investigate the mechanism of the experimental results.
Highlights
The vortex-induced vibration (VIV) is a typical windinduced vibration, especially for long-span bridges
It should be noted that the focus of most studies in the past was on the VIV of circular cylinders [1,2,3,4,5,6,7,8,9,10,11]; the VIV of bridge decks, as a typical bluff body of structural works, exhibits substantially different flow features from circular cylinders
Matsumoto et al [14] investigated the interaction between Karman and motion-induced vortices for a rectangular cylinder with an aspect ratio of 4 : 1 and a hexagonal box girder with/without handrails; the experimental results indicated that the VIV of both models was essentially excited by the motion-induced vortices which were mitigated by the presence of Karman vortices
Summary
The vortex-induced vibration (VIV) is a typical windinduced vibration, especially for long-span bridges. Shiraishi and Matsumoto [13] investigated five simplified bridge deck cross sections with various aspect ratios to guide the deck optimization towards VIV response reduction. The results indicated that bridge decks with a longer rear body are more effective in mitigating VIV. Matsumoto et al [14] investigated the interaction between Karman and motion-induced vortices for a rectangular cylinder with an aspect ratio of 4 : 1 and a hexagonal box girder with/without handrails; the experimental results indicated that the VIV of both models was essentially excited by the motion-induced vortices which were mitigated by the presence of Karman vortices. Larose et al [15] investigated the Reynolds number effect on the VIV of Stonecutters Bridge It appeared that the bridge deck appendages
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