复杂山区水库蓄水影响下的库区桥址风特性数值模拟研究王云飞1汪斌.docVIP

复杂山区水库蓄水影响下的库区 风特性 王云飞 (1. 西南交通大学桥梁工程系，四川成都610031) 摘要：为研究山区水电大坝蓄水库区桥位风场特性。本文以某复杂深切峡谷大跨度悬索桥为工程背景，通过Gambit和构建了蓄水后的地形，。分析。研究表明，。研究结果为桥梁的抗风设计提供一定的依据。 关键词：；复杂山区；大跨度桥梁；风场特性；数值模拟 Numerical simulation of wind characteristics over bridge site in complicated mountains under the influence of reservoir water storage Wang Yunfei Wang Bin1 LiYongle1 (1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China) Abstract : To investigate the influence of mountain hydropower dam on wind characteristics for bridge site over reservoir area after water storage, a long-span suspension bridge over a deep-cutting gorge in complicated mountain area is regarded as an example. The numerical terrain model after reservoir water storage is built by Gambit and ICEM. Numerical simulation of the wind field distribution of the bridge site is carried out by employing CFD commercial software FLUENT. According to comparative analysis of 36 cases of different wind directions，the variation of average wind velocity，wind attack angel，wind profile，and wind velocity amplification factor along bridge deck in different flow directions are discussed. The result shows that the mountain wind characteristics over the reservoir area is very complex. Transverse average wind velocities of bridge deck change a lot in different flow directions, and a big negative attack angel is found on bridge deck. Transverse wind velocities decline along the bridge deck from north shore to the south shore in typical cases. Distribution of wind profile is complex in most cases，which is far different from the general exponential law. The bridge site has a relatively obvious acceleration effect with a wind velocity amplification factor up to 1.06. The research conclusions provide a basis for wind-resistant design of long-span mountain bridges over reservoir area. Keywords: reservoir water storage；complicated mountain； long-span bridge； wind characteristic；numerical simulat 引言 悬索桥因其超强的跨越能力被广泛