Numerical Simulation of Wind Field at Canyon Bridges with High Precision Inlet Boundary

被引：0
|
作者：
Shen L. [1 ,2 ]
Hua X.-G. [2 ]
Han Y. [3 ]
Cai C.-S. [4 ]
Wei C.-L. [1 ]
机构：
[1] School of Civil Engineering, Changsha University, Changsha, 410022, Hunan
[2] School of Civil Engineering, Hunan University, Changsha, 410082, Hunan
[3] School of Civil Engineering, Changsha University of Science & Technology, Changsha, 410076, Hunan
[4] Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, 70803, LA
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2020年 / 33卷 / 07期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Bridge engineering; Inlet boundary; LES; Mountain canyon wind field; Multi-scale coupling;
D O I：
10.19721/j.cnki.1001-7372.2020.07.012
中图分类号：
学科分类号：
摘要：
Wind fields in mountain canyons are complicated due to the influence of topographical conditions and terrain. Large-span bridges established in these areas face prominent wind-induced vibration problems. The wind-resistance design of a canyon bridge is thus not yet clear. In this study, multi-scale coupling technology was used, between Weather Research and Forecasting (WRF) and Computational Fluid Dynamics (CFD), to analyze the wind field of a gorge-bridge site. Accordingly, the average wind speed at the inlet boundary was obtained by polynomial interpolation, while the fluctuating wind speed at the inlet boundary was acquired from the field measuring station. The Weighted Amplitude Wave Superposition (WAWS) method was then utilized to generate random fluctuating wind velocities. Using the User Defined Function (UDF) program, the target wind-field dates were assigned to the inlet boundary of Large Eddy Simulation (LES). The results showed that the rationality of the wind filed distribution improves while under the fluctuating wind speed. The standard spectrum utilized in China is not suitable for complex mountain gorge areas. If the existing codes are used to design mountain gorge bridges, the design results will be unsafe. The complex local topography of the upper canyon is the main reason for the diversity of the wind field at the canyon bridge site. When the inflow is along the gorge trend, the acceleration effect may occur inside the gorge, which is more apparent when the inflow wind passes through the complex mountain. Results from related research can provide references for the wind-resistance design of large-span bridges in mountain valleys. © 2020, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：114 / 123
页数：9
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