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双河大桥桥址位于云贵高原昭通市西北,地处乌蒙山石漠化片区,金沙江亚热带河谷深切割地带,其地形地貌复杂多变,但同时也是亚热带河谷山区桥址的典型代表。此类地形处的风环境十分复杂,而现有规范中的风特性参数并不能很好的反映出桥梁实际所受到的风荷载情况,因此探索通过地形模拟风洞试验来确定相应的参数,为双河大桥抗风性能研究提供可靠参数,包括风速剖面,地表粗糙系数,风速系数,紊流强度等。
Shuanghe Bridge is located in the northwestern part of Zhaotong City, Yunnan-Guizhou Plateau. It is located in the rocky desertification area of Wumeng Mountain and the deep cutting zone of the Jinsha River subtropical river valley. Its topography is complicated and changeable, but it is also a typical representative of the bridge site in the subtropical valley. The wind environment at such terrain is very complicated. However, the wind parameters in the existing norms do not reflect the actual wind load on the bridge. Therefore, the wind tunnel test to determine the corresponding parameters through the topography is The research on wind-resistance of Shuanghe Bridge provides reliable parameters including wind speed profile, surface roughness coefficient, wind speed coefficient, turbulence intensity and so on.