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

Issue:

2025年03期

Page:

147-157

Research Field:

桥隧工程

Publishing date:

Info

Title:

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

Author(s):

SONG Jiaman

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

Keywords:

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

PACS:

TU311

DOI:

10.19815/j.jace.2024.12116

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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Memo

Memo:

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Common functions

Last Update: 2025-06-01