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

发布时间：2018-05-24 00:16

本文选题：水库蓄水 + 复杂山区　；参考：《福州大学学报(自然科学版)》2017年04期

【摘要】：以某复杂深切峡谷大跨度悬索桥为工程背景,构建桥址区水库蓄水后的地形数值模型,对桥址区进行区域地形风场数值模拟研究.通过36个不同来流工况的对比分析,探讨水库蓄水后的主梁平均风速、风攻角、风剖面以及风速放大系数在不同来流风向下的变化规律.研究表明,山区库区桥址风场特性分布比较复杂:主梁横桥向平均风速随来流风向变化较大,主梁出现较大负攻角效应;典型工况下横桥向风速沿主梁由北岸向南岸递减;多数工况下,桥址区风剖面分布复杂,远不同于常规指数律;桥位出现较明显的峡谷风效应,风速放大系数最高达1.06.研究结果为水库库区大跨度桥梁的抗风设计提供一定的依据.
[Abstract]:Taking a large span suspension bridge of a complex deep gorge as the engineering background, the terrain numerical model of the reservoir after impoundment in the bridge site area is constructed, and the regional topographic wind field numerical simulation of the bridge site area is carried out. Based on the comparative analysis of 36 different incoming flow conditions, the variation law of average wind speed, wind attack angle, wind profile and wind speed magnification coefficient of main beam after reservoir impoundment are discussed. The results show that the wind field characteristics of the bridge site in the mountainous area are quite complicated: the average wind velocity of the main beam crossbridge changes greatly with the incoming wind direction, and the main beam has a large negative angle of attack effect, and the wind velocity in the transverse bridge direction decreases from the north shore to the south bank under typical working conditions. In most cases, the wind profile distribution in the bridge site area is complex, which is far different from the conventional exponential law, and the canyon wind effect is obvious at the bridge site, and the maximum wind speed magnification factor is 1.06. The results provide some basis for wind-resistant design of long span bridges in reservoir area.
【作者单位】：西南交通大学桥梁工程系;
【基金】：国家自然科学基金资助项目(51525804,51508480) 四川省青年科技创新研究团队资助项目(2015TD0004)
【分类号】：U442.59

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