西南交通大学学报2018，Vol.53Issue(1)：95-101,145,8.DOI:10.3969/j.issn.0258-2724.2018.01.012
水库蓄水对山区桥址风特性的影响
Influence of Reservoir Water Storage on Wind Characteristics over Bridge Site in Mountainous Area
摘要
Abstract
In this study,the influence of a hydropower dam built in a mountainous region on the wind characteristics of a bridge site in the reservoir area after storing water was examined. For this purpose, the example of a long-span suspension bridge over a deep-cutting gorge in a complicated mountainous area was considered. The numerical terrain model of the original site and that of the site after the reservoir was filled with water were built by Gambit and ICEM. Numerical simulations for the two models were performed by employing computational fluid dynamics commercial software FLUENT. Different cases were analysed to identify the influence of the reservoir water storage on the distribution of wind velocities along the vertical direction and along the bridge deck,and to identify the influence of water storage on the average velocity of the bridge deck,attack angle,and wind direction angle. The wind velocity at the bridge site clearly increases as compared to the velocity before the reservoir is filled with water,and the velocity amplification factor reaches up to 1. 14. However,the velocity amplification factor decreases significantly after the reservoir was filled with water. The average velocity of the bridge deck in most cases decreased to different extents,and the effect of the positive attack angle decreased significantly after reservoir water storage. The variation in the average wind direction angle is consistent with that in the original model. The wind profile shapes exhibit considerable changes in a low altitude range after water storage,but they gradually tend to be the same as the altitude increases. The conclusions of this study provide a basis for the wind-resistant design of bridges.关键词
山区/大跨度桥梁/风特性/水库蓄水/数值模拟Key words
mountainous area/long-span bridges/wind characteristics/reservoir water storage/numerical simulation分类
交通工程引用本文复制引用
王云飞,汪斌,李永乐..水库蓄水对山区桥址风特性的影响[J].西南交通大学学报,2018,53(1):95-101,145,8.基金项目
国家自然科学基金资助项目(51525804,51508480) （51525804,51508480）
四川省青年科技创新研究团队(2015TD0004) （2015TD0004）
