Submerged floating tunnel(SFT) is a new traffic structure across long and deep waterway. The vortex-induced vibration of cables will occur under action of water current. Privious studies were done by using numerical methods, however, experiment is indispensable mean to explore VIV mechanism of cables in water. In this paper, taking cables of Qiandao Lake SFT for prototype, the experiments of VIV on cable were carried out under the action of current by using segment models in stormy stream integrated sink. The results show that inertial force coefficient Cm of circular cable is 0.94, linear fluid damping ratio ξ’ is 1.26%; when the reduced velocity is between 5.8~10.1, the vortex-induced resonance will occur, the maximum lateral amplitude Ay/D is 1.10, the in-line amplitude is still low, and the lift coefficient CL and drag coefficient CD will increase. The parametric analysis concluded that the diagonal arrangement of circular cables will be helpful to reduce the VIV effects and the changing of flow direction will adversely affect vibration of inclined cables.
Key words
Submerged floating tunnel /
Vortex-Induced vibration /
Segment model /
Fluid-Structure Interaction /
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References
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