宽幅流线型钢箱梁涡振性能气动优化措施研究

发布时间：2018-05-03 10:30

本文选题：钢箱梁 + 涡振　；参考：《桥梁建设》2017年01期

【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。
[Abstract]:In order to understand the vortex vibration performance of wide streamlined steel box girder at large angle of attack, determine the eddy vibration sensitive member of section and improve its vortex vibration performance, a 1:50 stiffened beam segment model was made with Taihong Yangtze River Bridge (a two-tower suspension bridge with a main span of 808m) as the background. The vortex vibration performance of its wide streamlined steel box girder under different attack angles was studied by wind tunnel test, and the vortex vibration performance was optimized by setting up-and-down railings, moving the track inside and reducing the angle of the wind nozzle, and so on. The vibration suppression effect of each optimization measure is tested. The results show that the vortex vibration performance of wide streamlined steel box girder becomes worse with the increase of wind attack angle, the bridge deck rail is the most sensitive component of vortex vibration, and the influence of beam bottom track on vortex vibration is weak. Reducing the angle of wind nozzle has obvious effect on suppressing the response of vortex vibration, and combining with the moving energy of overhaul track, the response of vortex vibration is restrained more obviously.
【作者单位】：长沙理工大学土木与建筑学院;贵州桥梁建设集团有限责任公司;湖南大学风工程试验研究中心;
【基金】：国家重点基础研究规划(973计划)项目(2015CB057706) 国家自然科学基金资助项目(51208067,51278069,51478049) 湖南省重点学科创新项目(2013ZDXKC5)~~
【分类号】：U441.3

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