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坝陵河特大桥位于地形特殊的山区,桥址风环境非常复杂,是我国西部山区桥址的典型代表,为了正反映桥址处风的实际状况,探索通过地形模拟风洞试验来确定桥梁设计基准风速和相关的风特性参数的方法和可靠性,为将来类似桥梁提供参考。试验研究结果表明:坝陵河特大桥在横桥向来流作用下,跨中桥面高度处风速受到“峡管效应”的增速作用;峡谷内平均风剖面的分布具有明显的不均匀性,桥面高度处平均攻角范围为±4.7°,高于规范要求的±3°;桥面高度处的水平和竖向脉动风速功率谱与规范谱在高频区吻合较好,在低频区有较大差别,本文采用较为接近的Von Karman脉动风速功率谱。
Baling River Bridge is located in a special mountainous terrain, the bridge site wind environment is very complex, is a typical representative of the western mountainous bridge site in order to reflect the actual situation of the wind at the bridge site to explore through the topography simulation wind tunnel test to determine the bridge design Method and reliability of reference wind speed and related wind parameters to provide references for similar bridges in the future. The experimental results show that the wind speed at the bridge deck height is affected by the “channeling effect” under the effect of the lateral flow of the bridge. The distribution of the average wind profile in the valley is obviously uneven The average angle of attack at the deck height is ± 4.7 °, which is ± 3 ° higher than the specification; the horizontal and vertical pulsating wind speed power spectrum at the deck height is in good agreement with the canonical spectrum in the high frequency region, There is a big difference in the region, this paper uses a closer Von Karman pulsating wind power spectrum.