基于节段模型试验的宽幅箱梁涡振性能气动措施优化
发布时间：2018-08-21 07:39
【摘要】：为了研究宽幅流线型箱梁断面的涡振性能,以某跨越长江的大跨悬索桥为背景,进行1∶50节段模型风洞试验。分析了检修轨道、人行道栏杆等涡振敏感构件的影响,研究了改变人行道栏杆形式、附加斜腹板导流板以及风嘴分流板等气动措施的制振效果。研究结果表明,宽幅箱梁涡振性能随来流攻角增大而逐渐变差,且由于漩涡Strouhal数的变化易诱发多区间涡振,扭转涡振幅值随阻尼增加线性衰减显著。人行道栏杆是此类断面的涡振敏感构件,去掉栏杆踢脚石能明显改善涡振性能;斜腹板导流板对改善其涡振性能效果微弱;风嘴分流板具有显著的制振效果,不仅能有效地抑制主梁涡振的发生,且能提高颤振临界风速。
[Abstract]:In order to study the vortex-vibration behavior of a wide streamlined box girder section, a 1:50 section model wind tunnel test was carried out on a long-span suspension bridge across the Yangtze River. The effect of vortex vibration sensing components such as overhauling track and sidewalk railing is analyzed. The effect of aerodynamic measures such as changing the form of sidewalk railing adding inclined web plate diversion plate and wind nozzle shunt plate is studied. The results show that the vortex vibration performance of wide box girder becomes worse with the increase of the angle of attack, and the amplitude of torsional vortex decreases linearly with the increase of damping due to the variation of swirl Strouhal number. The sidewalk railings are the vortex vibration sensitive components of this kind of section. Removing the railings kick stone can obviously improve the vortex vibration performance, the inclined web diversion plate has a weak effect on improving the vortex vibration performance, and the wind nozzle shunt plate has remarkable vibration control effect. Not only can the vortex vibration of the main beam be effectively suppressed, but also the critical flutter velocity can be increased.
【作者单位】： 贵州桥梁建设集团有限责任公司;长沙理工大学土木与建筑学院;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
，
本文编号：2195017
[Abstract]:In order to study the vortex-vibration behavior of a wide streamlined box girder section, a 1:50 section model wind tunnel test was carried out on a long-span suspension bridge across the Yangtze River. The effect of vortex vibration sensing components such as overhauling track and sidewalk railing is analyzed. The effect of aerodynamic measures such as changing the form of sidewalk railing adding inclined web plate diversion plate and wind nozzle shunt plate is studied. The results show that the vortex vibration performance of wide box girder becomes worse with the increase of the angle of attack, and the amplitude of torsional vortex decreases linearly with the increase of damping due to the variation of swirl Strouhal number. The sidewalk railings are the vortex vibration sensitive components of this kind of section. Removing the railings kick stone can obviously improve the vortex vibration performance, the inclined web diversion plate has a weak effect on improving the vortex vibration performance, and the wind nozzle shunt plate has remarkable vibration control effect. Not only can the vortex vibration of the main beam be effectively suppressed, but also the critical flutter velocity can be increased.
【作者单位】： 贵州桥梁建设集团有限责任公司;长沙理工大学土木与建筑学院;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
，
本文编号：2195017
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