|Table of Contents|

Influence of wind barrier structural parameters on traffic wind environment of twin-box girder(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年2期
Page:
46-59
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Influence of wind barrier structural parameters on traffic wind environment of twin-box girder
Author(s):
LI Jia-wu1; 2;  LIU Xin-yu1; 2;  XU Min-jian1; 2; 3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Wind Tunnel Laboratory,Chang'an University, Xi'an 710064, Shaanxi, China; 3. Traffic Engineering Management Center of Quzhou City, Quzhou 324003, Zhejiang, China)
Keywords:
bridge engineering;  traffic wind environment;  numerical simulation;  wind barrier;  windproof ratio;  height ratio;  crosswind reduction coefficient
PACS:
U441.3
DOI:
10.19721/j.cnki.1671-8879.2025.02.005
Abstract:
To investigate the influences of wind barrier windproof ratio and height ratio on the bridge deck traffic wind environment of the twin-box girder, a twin-box girder of a viaduct in a sea-crossing channel was selected as the research object, and a computational fluid dynamics(CFD)numerical simulation study was conducted. Firstly, a static flow numerical model was established and the grid independence was verified. Secondly, the influence of wind barrier on the wind profile of the bridge deck was studied using the numerical simulation method. An analysis was conducted on the variation patterns of wind profiles at upstream and downstream lane positions and windproof height with changes in wind barrier structural parameters. A comparative analysis was conducted with the original cross section without wind barriers. Finally, the impacts of wind barrier windproof ratio and height ratio on driving safety on the bridge deck were assessed through the equivalent wind speed and crosswind reduction coefficient. Meanwhile, based on the three-component coefficients, a comprehensive evaluation index for wind barrier was introduced, and the recommended values for the wind barrier windproof ratio and height ratio were provided. The research results show that wind barriers with different windproof ratios and height ratios will significantly alter the wind profile of the bridge deck lanes, with the lanes closer to the wind barrier structure experiencing a more pronounced effect. The increases in the wind barrier windproof ratio and height ratio can enhance the wind reduction effect and improve the traffic wind environment for bridge deck. However, this also leads to an increase in the drag coefficient, resulting in higher wind loads on the bridge. Considering both the wind reduction effect of the wind barrier and the impact of wind load on the bridge, a 75% windproof ratio and a 0.45 height ratio are recommended to ensure the driving safety of container trucks and passenger cars on the twin-box girder.4 tabs, 17 figs, 32 refs.

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Last Update: 2025-04-01