大跨度悬索桥涡振风洞试验与现场实测比较

Wind Tunnel Test and Field Measurement on Vortex-induced Vibration of Long-span Suspension Bridge

选取国内典型悬索桥进行了不同缩尺比的节段模型涡振风洞试验研究,多方面比较了典型桥梁断面竖弯涡振响应的影响因素,并将试验涡振响应结果与实桥涡振响应监测结果进行了比较。研究结果表明,风攻角、导流板、模型尺寸及模型阻尼比从不同角度影响涡振位移最大值和涡振风速锁定区间,大尺寸节段模型试验结果与现场实测结果基本一致,而小尺寸节段模型试验不能有效发现涡振现象。

The influencing factors of bridge vertical vortex-induced vibration were compared by carrying out wind tunnel test on typical suspension bridge in different scales,and the results of wind tunnel test were compared with those of full-scale measurement. It is found that the wind angle of attack,the guide plates,the model size and the damping ratio could influence the maximum value of the vortex-induced vibration and the lock-in region. The results from big-scale section-model wind tunnel test are consistent with those from the fullscale bridge while small-scale section-model wind tunnel test could not accurately identify the lock-in region and amplitudes.