中南大学学报（自然科学版）2025，Vol.56Issue(2)：560-574,15.DOI:10.11817/j.issn.1672-7207.2025.02.013
高铁大跨扁平箱梁桥涡振性能及抑振措施研究
Studies on vortex-induced vibration performance and vibration suppression measures of long-span flat box girder bridge of high-speed railway
摘要
Abstract
With the development of high-speed railway in China,a new shape of flat box girder is widely used in long-span railway bridges.In order to study the wind resistance performance of this type of girder bridge,a large-span flat box girder bridge without wind fairings was taken as the research background.Through section model vibration test,pressure measurement test and flow visualization test,the VIV performance of this type of main girder during construction and bridge completion stage,the vibration suppression mechanism and effect of wind fairings and guide vanes were studied.The results show that the vertical bending vortex-induced vibration occurs at the three inflow angles(α=-3°,0°,+3°)at the maximum single cantilever state in the construction stage and the bridge completion stage.The flow separation of the front edge of this type of box girder presents a distribution similar to that of a rectangular body.The results of flow visualization test confirm that the structure forms a regular Karman vortex street in the vortex vibration state during the construction stage and the bridge completion stage.When the wind fairings are installed,the vortex vibration at each angle of attack of the maximum single cantilever in the construction stage and at+3° angle of attack in the bridge completion stage are completely suppressed,the absolute value of negative pressure and the maximum value of fluctuating pressure at the upper edge decrease obviously.The vortex vibration at-3° and 0° angle of attack in the bridge completion stage are not suppressed and maximum of the fluctuating pressure in the upper region cannot be reduced.When the guide vanes are installed,the vortex vibration of the maximum single cantilever at-3° angle of attack completely disappears,and the vortex vibration at+3° angle of attack is reduced by 12.3％,which has no inhibition effect on the vortex vibration at 0°.In the bridge completion stage,the vortex vibration decreases by 66.4％at-3° angle of attack,58.9％at 0° angle of attack and 57.2％at+3° angle of attack.The guide vanes can not reduce the absolute value of negative pressure at the upper edge of the structure during construction and completion,but can reduce the maximum of fluctuating pressure at the lower edge.The flow visualization tests of the two vibration suppression measures reveal the mechanism of the vibration suppression,the wind fairings significantly reduce the flow separation scale at the leading edge,and the large scale separation bubble cannot form at the upper edge of the structure,which inhibits the formation of wake vortex shedding.The guide vanes inhibits the formation of large-scale flow separation at the lower edge of the structure,and inhibits the regular Karman vortex of the wake.关键词
扁平箱梁/涡激振动/抑振措施/风洞试验Key words
flat box girder/vortex-induced vibration/vibration suppression measures/wind tunnel test分类
交通运输引用本文复制引用
张艺,李欢,魏高翔,何旭辉,谢祖育..高铁大跨扁平箱梁桥涡振性能及抑振措施研究[J].中南大学学报（自然科学版）,2025,56(2):560-574,15.基金项目
国家自然科学基金资助项目(51925808,52208514,52327810) （51925808,52208514,52327810）
湖南省自然科学基金资助项目(2024JJ4063)(Projects(51925808,52208514,52327810)supported by the National Natural Science Foundation of China （2024JJ4063）
Project(2024JJ4063)supported by the Natural Science Foundation of Hunan Province) （2024JJ4063）
