CFD Study of Effect of Elliptical Baffle Wind Barrier on Traffic Wind Environment of a Bridge

被引：0

作者：

Wen Y. ^{[1
,2
]}

He Q.-Y. ^{[1
,2
]}

Yan L. ^{[1
,2
,3
]}

He X.-H. ^{[1
,2
,3
]}

Kang X.-M. ^{[1
,2
]}

机构：

[1] National Engineering Research Center for High-speed Railway Construction, Central South University, Hunan, Changsha

[2] School of Civil Engineering, Central South University, Hunan, Changsha

[3] Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures, Hunan, Changsha

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2024年 / 37卷 / 05期

基金：

中国国家自然科学基金;

关键词：

bridge engineering; CFD; crosswind reduction factor; porosity; traffic wind environment of bridge; wind barrier;

D O I：

10.19721/j.cnki.1001-7372.2024.05.019

中图分类号：

学科分类号：

摘要：

A detailed computational fluid dynamics (CFD) study was conducted to investigate the influence of an elliptical baffle wind barrier (EBWB) on the traffic wind environment of a bridge with a composite double - sided box section. The independence of the turbulence model, time step, and grid density was first analyzed. The crosswind reduction factors of the bridge with EBWB and a conventional rectangular baffle wind barrier (RBWB) on a 1. 71 m high crash barrier were compared, and the traffic wind environments with and without RBWB were also obtained. The effects of the porosity and height of the EBWB on the traffic wind environment of the bridge were analyzed using the crosswind reduction factor, wind profile curve, and flow field structure. A comprehensive index that takes into account the static drag coefficient was introduced to determine the optimal wind barrier design. The results show that the difference between the calculated static aerodynamic coefficients of two turbulence models, SST k-oj and RNG k-z, is small, with only a 4. 02% difference for drag coefficient at zero wind a ttack angle, indicating that the current numerical simulation method is reliable. The EBWB has a satisfactory wind reduction effect, similar to that of the RBWB, and the bridge with the EBWB has a smaller crosswind reduction factor and a larger drag coefficient. The traffic wind environment of a bridge can be improved by reducing the EBWB porosity or increasing the EBWB height; however, wind loading increases proportionately. For the bridge with a composite double-sided box section in this study, an optimal EBWB design is considered to be one with 52% porosity and a 1. 486 m high wind barrier (3. 196 m high total barrier), taking into account the traffic wind environment and wind loading. © 2024 Chang'an University. All rights reserved.

引用

页码：289 / 299

页数：10

共 28 条

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