西部山区U型峡谷桥位处风场特性实测研究

Measured research on the characteristics ofwind field at the U-shaped canyon bridge in the western mountainous area

山区峡谷桥位处风场特性同沿海和平原地区有较大差异,为研究西部山区峡谷桥位处风场特性,选取西部山区一典型U型峡谷(拟新建桥梁)为研究对象,在桥址南岸设立高50 m和30 m的测风塔进行时长为一个月的现场实测,实测结果表明:主导风向与峡谷及河道走向一致,平均风速在每日呈现出周期的规律性变化,而桥位处风攻角随风速增大而减小,同时紊流积分尺度、紊流强度等风场参数与现行规范建议值有所区别,实测结果有利于同地形桥梁风场环境的研究。

The wind field characteristics of mountain canyon bridges are quite different from those in coastal and plain areas.In order to study the wind field characteristics of canyon bridges in western mountainous areas,a typical U-shaped canyon(planned to be newly built bridge)in western mountainous areas is selected as the research object.The wind measuring towers with heights of 50 meters and 30 meters were set up on the south bank for a month-long on-site measurement.The actual measurement results showed that the dominant wind direction was consistent with the direction of the canyon and the river,and the average wind speed showed periodic regular changes every day,while the bridge position The wind angle of attack decreases with the increase of wind speed.At the same time,the wind field parameters such as turbulence integral scale and turbulence intensity are different from the recommended values of the current code.The measured results can provide a reference for the research on the wind field environment of bridges with the same terrain.