中文摘要：

为了解宽幅流线型钢箱梁在大攻角下的涡振性能,确定断面的涡振敏感构件,改善其涡振性能,以太洪长江大桥（主跨808m的双塔悬索桥）为背景,制作1∶50加劲梁节段模型,通过风洞试验研究其宽幅流线型钢箱梁在不同攻角下的涡振性能,通过设置检修道栏杆抑流板、检修轨道内移及减小风嘴角度等气动措施对其涡振性能进行优化,并测试各优化措施的抑振效果。结果表明：宽幅流线型钢箱梁涡振性能随来流风攻角增大逐渐变差;桥面检修道栏杆是涡振首要敏感构件,梁底检修轨道对涡振的影响较弱;设置检修道栏杆抑流板、减小风嘴角度对抑制涡振响应均有明显效果,同时结合检修轨道内移能更显著地抑制涡振响应。

英文摘要：

To investigate the vortex-induced vibration（VIV）performance of the wide streamlined steel box girder at the large wind attack angles,determine the VIV sensitive components in the section of the girder and improve the VIV performance,the Taihong Changjiang River Bridge（a double-tower suspension bridge with the main span of 808m）was cited as an example,the sectional model on the scale of 1∶50for the stiffening girder of the bridge was made and the VIV performance of the wide streamlined steel box girder at the different large wind attack angles was studied through the wind tunnel test.The VIV performance of the steel box girder was optimized,using the aerodynamic measures of installing the flow suppression boards on the railings of the maintenance ways on the deck,moving the maintenance rails underneath the girder inward,reducing the angles of the wind fairings and the effect of the vibration suppression of the different aerodynamic optimization measures was tested.The results show that the VIV performance of the wide streamlined steel box girder gradually becomes poor with the increase of the wind attack angles.The railings of the maintenance ways are the main VIV sensitive components.The influences of the maintenance rails on the VIV performance are weak.The installing of the flow suppression boards on the railings of the maintenance ways and the reducing of the angles of the wind fairings have notable effect on the suppression of the VIV responses and together with the inward moving of the maintenance rails,the VIV responses can be suppressed even more notably.