[1]高广中,徐兆升,薛晓锋,等.来流大攻角下小宽高比H型断面的涡振特性[J].长安大学学报(自然科学版),2025,45(4):118-128.[doi:10.19721/j.cnki.1671-8879.2025.04.010]
　GAO Guang-zhong,XU Zhao-sheng,XUE Xiao-feng,et al.Vortex-induced vibration characteristics of H-shaped cross-section with small aspect ratio under large attack angles[J].Journal of Chang’an University (Natural Science Edition),2025,45(4):118-128.[doi:10.19721/j.cnki.1671-8879.2025.04.010]
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来流大攻角下小宽高比H型断面的涡振特性()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年4期
页码:
118-128
栏目:
桥梁与隧道工程
出版日期:
2025-07-30

文章信息/Info

Title:
Vortex-induced vibration characteristics of H-shaped cross-section with small aspect ratio under large attack angles
文章编号:
1671-8879(2025)04-0118-11
作者:
高广中1; 徐兆升1; 薛晓锋1; 马腾飞2; 严庆辰3; 李加武1
(1. 长安大学 公路学院,陕西 西安 710064; 2. 华设设计集团股份有限公司,江苏 南京 210014; 3. 苏交科集团股份有限公司,江苏 南京 210000)
Author(s):
GAO Guang-zhong1;  XU Zhao-sheng1;  XUE Xiao-feng1;  MA Teng-fei2; YAN Qing-chen3;  LI Jia-wu1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Design Group Co., Ltd., Nanjing 210014, Jiangsu, China; 3. JSTI Group Co., Ltd., Nanjing 210000, Jiangsu, China)
关键词:
桥梁工程;  涡振;  同步测压测振试验;  H型断面;  Scruton数;  紊流风场;  气动升力
Keywords:
bridge engineering;  vortex-induced vibration;  synchronous vibration-pressure test;  H-shaped cross-section;  Scruton number;  turbulence wind field;  aerodynamic lift force
分类号:
U443.35
DOI:
10.19721/j.cnki.1671-8879.2025.04.010
文献标志码:
A
摘要:
为探究质量-阻尼参数(Scruton数)和来流紊流风场对小宽高比H型断面在大攻角下涡振(VIV)特性的影响,以曾家岩嘉陵江大桥刚性吊杆为工程背景,基于宽高比为1.9的H型断面设计了弹性悬挂节段模型,并开展了同步测振测压试验; 通过测振试验研究了Scruton数和来流紊流风场对大攻角下H型断面涡振特性的影响规律,结合测压试验获取的H型断面风压系数分布,从微观气动力的角度解释了来流紊流对H型断面的涡振性能影响机理。研究结果表明:宽高比为1.9的H型断面在30°攻角下出现了横风向涡振,增大Scruton数可有效减小H型断面在大攻角来流下的涡振稳定振幅,其减幅近似呈指数衰减,且涡振锁定区间随之缩窄,但仅依靠增大Scruton数无法完全抑制振动; 来流紊流会显著增大横风向涡振响应,紊流风场中的脉动成分使静止绕流状态下的模型周围出现规律且剧烈的涡脱,形成波动规律、频率单一的气动升力,且其卓越频率接近模型基频,从而引发涡振。由此可见,小宽高比H型断面的大攻角涡振响应须考虑来流紊流的不利影响。
Abstract:
To investigate the influences of mass-damping parameter(Scruton number)and incoming turbulence on vortex-induced vibration(VIV)characteristics of an H-shaped cross-section with small aspect ratio under large attack angles, the rigid hanger of the Zengjiayan Jialing River Bridge was taken as the engineering background, an elastically suspended segmental model of an H-shaped cross-section with an aspect ratio of 1.9 was designed, and synchronous vibration-pressure tests were conducted. The vibration tests were performed to examine the effects of Scruton number and incoming turbulence on VIV characteristics of the H-shaped cross-section under large attack angles. Combining with the wind pressure coefficient distribution of the H-shaped cross-section obtained from the pressure test, the influencing mechanism of incoming turbulence on the VIV characteristics was explained from the microscopic aerodynamic perspective. The research results indicate that the H-shaped cross-section with an aspect ratio of 1.9 exhibits crosswind VIV under a 30° attack angle. Increasing the Scruton number can effectively reduce the stable VIV amplitude of the H-shaped cross-section under large attack angles, with an approximately exponential decay trend, and the VIV lock-in range is narrowed. However, the vibration can not be fully suppressed only by increasing the Scruton number. The incoming turbulence significantly amplifies the crosswind VIV response. The fluctuating components in the turbulence wind field induce regular and intense vortex shedding around the model under static flow, generating a fluctuating aerodynamic lift force with a single dominant frequency close to the model's natural frequency, thereby triggering the VIV. It can be seen that the adverse effect of incoming turbulence must be considered in the VIV response of H-shaped cross-section with small aspect ratio under large attack angles.2 tabs, 16 figs, 30 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-01-30
基金项目:中央高校基本科研业务费专项资金项目(300104240923,300102214914)
作者简介:高广中(1988-),男,河南商丘人,副教授,工学博士,E-mail:ggz@chd.edu.cn。
通信作者:薛晓锋(1976-),女,河南许昌人,副教授,工学博士,E-mail:xuexiaofeng@chd.edu.cn。
更新日期/Last Update: 2025-07-25