基于CFD的双边钝体箱梁涡振性能及抑振措施研究

Study of the Vortex-Induced Vibration Performance of Double Bluff Body Box Girder and the Vibration Suppression Measures Based on CFD

【目的】为了掌握双边钝体箱梁在低风速下的风致振动情况,有必要对其涡振性能以及抑振措施进行研究。【方法】基于雷诺平均方法(RANS)和SST k-ω模型,采用CFD(Computational Fluid Dynamics)方法,对双边钝体箱形断面进行数值模拟,研究其在低风速下的风场信息和产生涡激共振的情况。【结果】得到原截面与各增设内挑式水平隔流板的工况下的压力、流场详情及振动情况。【结论】内挑式水平隔流板可有效抑制桥梁的涡激共振,且在各工况中增设1.5 m内挑式水平隔流板抑振效果最佳。

[Purposes]In order to study the wind-induced vibration of double bluff body box girder under low wind speed,it is necessary to study its vortex-induced vibration and vibration suppression measures.[Methods]Based on the Reynolds average method(RANS)and the SST k-ωmodel,a numerical simu-lation of the double bluff body box section was carried out by means of Computational Fluid Dynamics(CFD)to study the wind field information and vortex-induced vibration at low wind speed.[Findings]The pressure,flow field details and vibration conditions of the original section and each additional inter-nal lift horizontal baffle are obtained.[Conclusions]The vortex-induced vibration of the bridge can be effectively reduced by the internal lift horizontal baffle,and the vibration suppression effect of adding 1.5 m internal lift horizontal baffle in each working condition is the best.