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To study the influence of the railing ventilation rate on the vortex vibration characteristics of the blunt body box girder, the wind tunnel test is carried out by changing the ventilation rate of the lateral railing, and arranging the pressure measuring holes on the surface of the model. The railings are sealed in two ways: in the one-sealed three-open plan, a sealed segment is arranged every three open segments and in the one-sealed two-open plan, a sealed segment is arranged every two open segments. The ventilation rate of two ways was reduced by 25% and 33% respectively. Under different ventilation rate conditions, the relationship between the wind speed and amplitude of the main beam section and the wind pressure duration of each measuring point are measured. Then, the changes of average pressure coefficient, fluctuating pressure coefficient and power spectral density with the railing ventilation rate on each measuring point of the model surface are analyzed. The results show that the vortex-induced vibration of the main beam can be effectively suppressed by reducing the railing ventilation rate. However, the sensitivity of the torsional and vertical bending vortex-induced vibration to the railing ventilation rate of is different. When the railing ventilation rate decreases to a certain threshold, the vortex-induced vibration can be effectively restrained.
bridge engineering, vortex-induced vibration, aerodynamic measure, wind tunnel test
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