Ground effects on vortex-induced vibrations of a closed box girder
ZHOU Zhiyong1,2，MAO Wenhao3
1.State Key Laboratory for Disaster Reduction in Civil Engineering,Shanghai 200092,China;
2.Key Laboratory of Ministry of Communications for Bridge Structure Wind resistance,Shanghai 200092,China;
3.Shanghai Municipal Design & Research Institute ,Shanghai 200092,China
Abstract：As many existing or under-construction bridges are of lower height from the ground,the ground may have an adverse influence on the aerostatic and aerodynamic performances of bridges under wind loads. Wind tunnel tests and numerical simulations were adopted to study the ground effects on the vortex-induced vibrations of a closed box girder for illustration. The lock-in phenomena of vortex-induced vibrations over a range of wind velocities,the maximum amplitudes and their correlation with the height of the closed box girder apart from the ground under two different ground roughnesses were investigated by wind tunnel tests.The results show that the ground effect makes the vortex-induced phenomena occur in advance.Moreover,CFD (computational fluid dynamic) numerical simulations were carried out to study the lock-in phenomena,the maximum amplitudes and their correlation with the height of the girder under two different ground roughnesses.Through the CFD analysis on the flow fields around the girder,the mechanism of ground effect on the vortex-induced vibrations of closed box girders was described.
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