Mechanism of vortex-induced vibration in two lock-in regions for truss girder sections

被引：2

作者：

Shang, Congjie ^{[1
,2
]}

Xiang, Huoyue ^{[1
,2
]}

Bao, Yulong ^{[2
,3
]}

Li, Yongle ^{[1
,2
]}

Luo, Kou ^{[4
]}

机构：

[1] Southwest Jiaotong Univ, State Key Lab Bridge Intelligent & Green Construct, Chengdu 611756, Sichuan, Peoples R China

[2] Wind Engn Key Lab Sichuan Prov, Chengdu 610031, Sichuan, Peoples R China

[3] Southwest Jiaotong Univ, Inst Smart City & Intelligent Transportat, Chengdu 611756, Sichuan, Peoples R China

[4] China Railway Major Bridge Reconnaissance & Design, Wuhan 430050, Hubei, Peoples R China

来源：

JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS | 2024年 / 255卷

基金：

中国国家自然科学基金;

关键词：

Vortex-induced vibration; Truss girder; Two lock-in regions; Wind tunnel test; Numerical model; Time-frequency characteristic; INDUCED OSCILLATION; SUSPENSION BRIDGE; EXCITATION; CYLINDERS;

D O I：

10.1016/j.jweia.2024.105946

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The long-span bridge has a flexible structure and low damping. And the truss girder section is relatively blunt, which is prone to vortex-induced vibration(VIV). Initially, the wind tunnel tests are carried out at two scales to test the two lock-in regions of VIV for the truss girder. Then, the fluid-structure coupling analysis numerical model of the simplified two-dimensional(2-D) section of the truss girder is established, and the analysis results are compared with the experiment. Finally, the time-frequency characteristics of the aerodynamic lift and the wind speed at the movable monitoring points, further the meso-mechanism of the vortex evolution in two lock-in regions are analyzed. The results indicate that there are both twice key changes in the lift frequency components during the whole process of VIV in the two lock-in regions with the increase in amplitude, which are related to the change in flow pattern. VIV in the first lock-in region is self-excited by the coupling of the wake vortex of the bridge deck and the motion of the model. VIV in the second lock-in of VIV is self-excited by the impinging shear layer instability at the leading edge of the bridge deck and the motion of the model.

引用

页数：17