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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年03期

页码:

147-157

栏目:

桥隧工程

出版日期:

2025-05-30

文章信息/Info

Title:

Study on coherent structure of separated section vortex-induced vibration flow field using double vertical stabilizing plates

文章编号:

1673-2049(2025)03-0147-11

作者:

宋家满

(中国铁建大桥工程局集团有限公司,天津 300300)

Author(s):

SONG Jiaman

(China Railway Construction Bridge Engineering Bureau Group Co., Ltd., Tianjin 300300, China)

关键词:

分离式双箱梁;  涡振;  风洞试验;  数值模拟;  逆序结构

Keywords:

separated double box girder;  vortex vibration;  wind tunnel test;  numerical simulation;  coherent order structure

分类号:

TU311

DOI:

10.19815/j.jace.2024.12116

文献标志码:

A

摘要:

以某实际大跨分离式双箱梁桥为研究背景,结合风洞试验与数值模拟方法,研究了设置双竖向下稳定板这一气动措施对主梁涡振响应的影响; 在此基础上,引入动模态分解(DMD)技术与拉格朗日拟序结构(LCS)方法,从拉格朗日视角下对主梁断面周围流场结构及示踪粒子的输运行为进行了深入分析。结果表明:原始主梁断面在不同攻角条件下均表现出显著的涡振现象,当采用双竖向下稳定板后,涡振幅值显著降低,结构响应得到有效控制; 数值模拟结果表明,优化后的断面能有效将中央开槽处的大尺度涡旋打散为小尺度结构,耗散掉原大尺度涡结构能量,并显著减小作用于下游断面的表面压力; 动模态分解显示优化后断面的平均流场在双竖板位置处存在着明显的涡结构,其流场主模态能量幅值和空间结构发生了明显改变,并改变了高阶流场结构; 从拉格朗日视角下显示出优化后中央开槽处的示踪粒子将明显增加,周围拉格朗日结构数量增多,形状变得相对扭曲且模糊,对周围流体粒子的吸引程度降低,导致下游箱梁所受的气动力减弱,尾流难以形成周期性、规律性的涡脱落行为,从而有效抑制涡激振动的发生。

Abstract:

Taking the actual large-span separated double box bridge as the study background, combined with wind tunnel tests and numerical simulation methods, the influence of aerodynamic measure of setting double vertical stabilizing plates on the vortex-induced vibration response of the main beam was studied. On the basis, dynamic mode decomposition(DMD)technology and Lagrangian coherent structure(LCS)method were introduced to conduct in-depth analysis of the flow field structure around the main beam section and the transport behavior of tracer particles from Lagrangian perspective. The results show that the original main beam section exhibits significant vortex-induced vibration under different attack angles. When double vertical stabilizing plates are used, the vortex-induced vibration amplitude is significantly reduced, and the structural response is effectively controlled. The numerical simulation results show that the optimized cross-section can effectively disperse the large-scale vortices at the central slot into small-scale structures, dissipate the energy of original large-scale vortex structure, and significantly reduce the surface pressure acting on the downstream cross-section. The dynamic mode decomposition shows that there is a significant vortex structure in the average flow field of the optimized section at the position of double vertical plate, and the main mode energy amplitude and spatial structure of the flow field have undergone significant changes, as well as the high-order flow field structure. From Lagrangian perspective, it is shown that the number of tracer particles at the optimized central slot will significantly increase, the number of surrounding Lagrangian structures will increase, and their shapes will become relatively distorted and blurred. The degree of attraction to surrounding fluid particles will decrease, resulting in a weakened aerodynamic force on the downstream box girder. The wake will be difficult to form periodic and regular vortex shedding behavior, effectively suppressing the occurrence of vortex-induced vibration.

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相似文献/References:

[1]李加武,朱长宇.基于表面风压分析的分离式双箱梁流场特性研究[J].建筑科学与工程学报,2021,38(02):69.[doi:10.19815/j.jace.2020.09081]
　LI Jia-wu,ZHU Chang-yu.Study on Flow Field Characteristics Around Separated Twin-box Girder Based on Surface Wind Pressure Analysis[J].Journal of Architecture and Civil Engineering,2021,38(03):69.[doi:10.19815/j.jace.2020.09081]

备注/Memo

备注/Memo:

收稿日期:2024-12-28
基金项目:中国铁建股份有限公司资助项目(2023-B10)
作者简介:宋家满(1980-),男,高级工程师,E-mail:20762214@qq.com。
Author resume: SONG Jiaman(1980-), male, senior engineer, E-mail: 20762214@qq.com.

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更新日期/Last Update: 2025-06-01