1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China; 2.Sichuan Provincial Key Lab for Wind Engineering,Chengdu 610031,China; 3.School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621002,China
Abstract：The vortex-induced vibration of the bridge is mainly affected by the aerodynamic shape, structural dynamic characteristics and flow characteristics of the beam section. The long-span bridge is a typical wind-induced sensitive structure, so it should be treated carefully in the design. This paper studies the vortex-induced vibration performance a long-span combined highway and railway truss bridge which contains two separated decks. The vortex-induced vibration of the girder was studied by wind tunnel experiment in XNJD-1 reflux series wind tunnel. Computational fluid dynamics (CFD) simulations were carried out, and a series of aerodynamic control measures were adopted to suppress the VIV of the truss girder. The spanwise periodic perturbation method is introduced into the VIV control of the truss girder. And the effect of the L-shaped baffle and the wavy wind fairing on the VIV is verified. Finally, the influence of the geometric parameters of the wavy wind fairing on mitigating VIV were investigated through wind tunnel experiments. The results show that the suppression effect of the wavy wind fairing is sensitive to the amplitude, and increasing the amplitude can effectively suppress the VIV of the girder.
陈天瑀1,2,马存明1,2,段青松3,向鸿鑫1,2. 大跨度公铁两用双层钢桁梁涡激振动控制研究[J]. 振动与冲击, 2024, 43(5): 12-19.
CHEN Tianyu1,2,MA Cunming1,2,DUAN Qingsong3,XIANG Hongxin1,2. VIV control of a large-span dual-layer steel truss beam bridge for highway and railway dual-purpose. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(5): 12-19.
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