Mechanism and Control on Vortex-induced Vibration of Main Deck of Long-span Cable-stayed Bridge with Double-level Decks for Highway and Railway

被引：0

作者：

Liu Z. ^{[1
,2
,3
]}

Zhou W. ^{[1
,2
,3
]}

Liu Z. ^{[1
,2
,3
]}

Yan A. ^{[4
]}

Xia Z. ^{[4
]}

Chen Z. ^{[1
,2
,3
]}

机构：

[1] State Key Laboratory of Bridge Engineering Safety and Resilience, Hunan University, Changsha

[2] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha

[3] College of Civil Engineering, Hunan University, Changsha

[4] China Railway Siyuan Survey and Design Group Co.,Ltd., Wuhan

来源：

Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2024年 / 51卷 / 01期

基金：

中国国家自然科学基金;

关键词：

aerodynamic control measures; bridge engineering; computational fluid dynamics; double-level decks truss girder; VIV mechanism; wind tunnel test;

D O I：

10.16339/j.cnki.hdxbzkb.2024001

中图分类号：

学科分类号：

摘要：

Based on a cable-stayed bridge with a main span of 808 m and double-level decks for highway and railway,the vortex-induced vibration(VIV)performance of the double-level decks of truss girder section under different wind attack angles and the vibration suppression effects of five aerodynamic control measures were studied by the section model wind tunnel tests. Combined with the static flow simulation via computational fluid dynamics (CFD),the VIV mechanism and control method of the double-level deck truss girder section were compared and analyzed,respectively. The research results show significant vertical and torsional VIV of the original main deck at +3° and 0° wind attack angles,and the amplitudes exceed the allowable values of the code. The torsional vortex vibration of the main girder can be effectively suppressed by enclosing the upper deck railings at intervals or adding flaps. However,the amplitude of the vertical VIV of the main girder exceeds the allowable values of the code. Furthermore,adding wind fairing at the outside of the upper chord can effectively suppress the vertical and torsional vortex vibration of the main girder. However,the main girder vortex vibration cannot be effectively suppressed by adding the wind fairing at the outside of the lower chord. Moreover,after the air flow is separated from the upper deck of the original design section of the main girder,periodic large-scale vortex shedding on its upper and lower surfaces is formed,and then attached to the rear of the upper deck,which is the main cause of the vertical VIV of the main girder. The wind fairing located at the outside of the upper chord can guide the airflow smoothly through the upper deck,eliminating periodic vortex shedding. Additionally,an along and narrow reattachment zone is formed on its upper surface. As a result,this effectively suppresses the VIV of the main deck. © 2024 Hunan University. All rights reserved.

引用

页码：1 / 13

页数：12

共 36 条

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