带悬臂流线型箱梁大比例节段模型涡振试验研究

发布时间：2018-05-27 23:19

本文选题：悬挑人行道板箱梁 + 涡激振动　；参考：《桥梁建设》2014年06期

【摘要】：大比例节段模型风洞试验是预测大跨度桥梁主梁涡振性能的有效方法之一。为研究带悬臂流线型箱梁涡振性能影响因素及气动优化措施,以某大跨悬索桥为工程背景,进行了1∶25大比例节段模型风洞试验。试验研究了不同来流攻角状态下主梁断面的涡振性能,并检验了移动检修轨道位置、安装悬臂、轨道导流板以及底板竖直稳定板等气动措施的制振效果。研究结果表明:随攻角由负变正,断面的扭转涡振性能逐渐变差;检修轨道向底板中央移动能有效降低涡振振幅,同时在检修轨上附加导流板能进一步地优化涡振性能,并且导流板越宽效果越明显;悬挑臂导流板以及底板设竖直中央稳定板不适于提高本文主梁断面涡振性能。
[Abstract]:Wind tunnel test with large scale segment model is one of the effective methods to predict the vortex vibration performance of the main girder of long span bridge. In order to study the influence factors of vortex vibration performance and aerodynamic optimization measures of streamlined box girder with cantilever, the wind tunnel test of a large scale section model at 1:25 was carried out with a long-span suspension bridge as the engineering background. In this paper, the vortex vibration performance of the main beam section under different attack angles is studied, and the vibration control effect of moving overhaul track position, cantilever installation, track guide plate and vertical stabilizing plate of bottom plate are tested. The results show that with the angle of attack changing from negative to positive, the torsional vortex vibration performance of the section becomes worse, the moving of the overhaul track to the center of the bottom plate can effectively reduce the amplitude of the vortex vibration, and the additional guide plate on the overhaul rail can further optimize the vortex vibration performance. The wider the diversion plate is, the more obvious the effect is, and the vertical central stabilized plate and the cantilever guide plate are not suitable for improving the vortex vibration performance of the main beam section in this paper.
【作者单位】：长沙理工大学桥梁工程安全控制技术与装备湖南省工程技术研究中心;湖南大学风工程试验研究中心;
【基金】：国家自然科学基金项目(51208067,51278069) 湖南省教育厅优秀青年项目(12B009) 铁四院科研项目~~
【分类号】：U446

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