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目的以分体式钢箱梁断面为研究对象,研究涡激振动控制措施,提出一新型的控制涡激振种动的格栅板形式.方法采用大尺度节段模型风洞试验,研究成桥状态该桥的涡激振动特性,并分析不同格栅板样式和空隙率对随风速变化的涡振振幅的影响.结果中央开槽断面的涡振性能较差,成桥状态涡振最大振幅达31.2 cm,加设50%空隙率格栅板后,涡振的振幅降低到10 cm以下.格栅板是一种有效的控制涡激振动的措施,格栅板的空隙率越小,抑制涡振的效果越好.结论空隙率相同时,顺桥向格栅和交叉格栅的抑振效果差不多,顺桥向格栅板抑制效果略好.
Aim To study the control measures of vortex-induced vibration and to propose a new type of grid plate for controlling vortex-induced vibration.METHODS The wind tunnel test of large-scale segment model was used to study the condition of bridge-forming The vortex-induced vibration characteristics of the bridge and the influence of different grid patterns and voids on the amplitude of vortex-induced vibration are analyzed.Results The vortex-induced vibration performance of the central slotted section is poor and the maximum amplitude of vortex-induced vibration 31.2 cm, the amplitude of vortex vibration is reduced to less than 10 cm by adding a 50% porosity grid.Grid plate is an effective measure to control vortex-induced vibration.The smaller the porosity of the grid plate, The better the vibration effect.Conclusion When the void ratio is the same, the vibration suppression effect of the parallel bridge to the grid and the cross grid is similar, and the suppression effect to the grid plate along the bridge is slightly better.