基于风洞试验的板桁分离及板桁结合梁颤振性能对比研究

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摘要为研究大跨度桥梁断面形式差异对颤振性能的影响，以赤水河桁架桥为研究对象，通过节段模型风洞试验分别对板桁结合断面与板桁分离断面进行颤振性能测试。试验结果显示，两种梁型在颤振特性上存在显著差异，板桁分离梁的颤振形态表现为自限幅弯扭耦合软颤振，且其起振风速、稳态振幅和颤振频率等模态特性随风攻角由负到正而增大、减小和增大；板桁结合梁的颤振形态包含发散型硬颤振与自限幅软颤振两种，其起振风速、颤振频率与耦合程度等特征随风攻角的变化无明显规律。最后基于试验数据，提取了振幅依存的模态阻尼比，初步探讨了颤振形态变化的力学机理，结果显示，板-桁分离间隙对模态阻尼演化曲线的改变，会进一步提高负攻角下系统的颤振发散风速，改善系统的颤振性能。

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	陈晨1
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	伍波2
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	李志国1
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	廖海黎1
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关键词 ：桁架梁, 颤振形态, 风洞试验, 模态阻尼, 极限环

Abstract：In order to study the effect of the difference of the section form on the flutter performance of the long span bridges, the Chishui River truss bridge was used as the research object, and the flutter performance of the combined section and the separated section of plate and truss are tested by the section model wind tunnel test respectively. The results show that there are significant differences between the two forms of sections in terms of flutter characteristics. The flutter pattern of the separated section is a self-limiting bending and twisting coupling soft flutter, and its modal characteristics such as starting wind speed, steady-state amplitude, and flutter frequency increase, decrease and increase with the wind angle of attack from negative to positive; the flutter pattern of the combined section contains two types of divergent hard flutter and self-limiting soft flutter, and the differences in flutter characteristics such as the starting wind speed, flutter frequency, and coupling degree caused by the change of wind angle of attack are not regular. Finally, based on the experimental data, the amplitude-dependent modal damping ratio is extracted, and the mechanical mechanism of the change of flutter pattern is initially discussed. The results show that the separation gap between the plate and the truss will affect the modal damping evolution curve, which increases the flutter dispersion wind speed and improves the flutter characteristics of the system under the negative angle of attack.

Key words： Truss girder flutter modality wind tunnel test modal damping ratio limit cycle oscillation

收稿日期: 2022-08-25 出版日期: 2023-10-28

引用本文:

陈晨1,2，伍波2,3，李志国1,2，廖海黎1,2. 基于风洞试验的板桁分离及板桁结合梁颤振性能对比研究[J]. 振动与冲击, 2023, 42(20): 48-57.
CHEN Chen1,2, WU Bo2,3, LI Zhiguo1,2, LIAO Haili1,2. A comparative study on the flutter stability of long span bridges with plate-truss separated and composite girders through wind tunnel tests. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(20): 48-57.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I20/48

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