Wind Tunnel Tests Study on Nonlinear Characteristics of Structural and Aerodynamic Damping of Steel Truss Girder Section Under Large-amplitude Post-flutter

被引：0
作者：
Han Y. [1 ]
Song J. [1 ]
Li K. [1 ]
Hu P. [1 ]
机构：
[1] School of Civil Engineering, Changsha University of Science & Technology, Hunan, Changsha
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 36卷 / 07期
基金：
中国国家自然科学基金;
关键词：
bridge engineering; limit cycle vibration; nonlinear damping; post-flutter; steel truss stiffening beam; wind tunnel test;
D O I：
10.19721/j.cnki.1001-7372.2023.07.004
中图分类号：
学科分类号：
摘要：
Through high-amplitude free vibration wind tunnel tests, the post-flutter characteristics of single-degree-of-freedom torsion and two-degree-of-freedom vertical torsion system for a typical steel truss girder section model were studied. The nonlinear evolution laws of structural and aerodynamic damping with amplitude were quantified, and the mechanism of the steel truss girder section limit cycle flutter was revealed from this perspective. By comparing the flutter behavior of the singlc-dcgrcc-of-freedom and two-degree-of-freedom systems, the influence of the vertical degree of freedom on nonlinear limit cycle flutter was analyzed, and its influencing mechanism was revealed. In addition, the influence of structural damping and torsional-bending frequency ratio on nonlinear limit cycle flutter was also explored. The results showed that the dependence of structural and aerodynamic damping on amplitude was the main reason to induce nonlinear limit cycle flutter. Compared with the single-degree-of-freedom system, the participation of the vertical degree of freedom introduced a quasi-linear vertical coupling aerodynamic negative damping to the two-degree-of-freedom system, which reduced the stability of the system, resulting in a lower flutter critical wind speed of the two-degree-of-freedom system than the single degree-of-freedom system. and also resulted in a greater amplitude of limit cycle flutter than the single degree-of-freedom system. Therefore, the vertical degree of freedom should not be ignored in flutter analysis. Increasing structural damping can significantly increase the flutter critical wind speed of the steel truss girder section and reduce the amplitude of the post-flutter limit cycle vibration. © 2022 Xi'an Highway University. All rights reserved.
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页码：56 / 66
页数：10
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