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目前国内跨越峡谷等复杂地形的大跨度桥梁建设日益增多,而现有的抗风规范对于复杂山区地形风速剖面的计算没有明确的规定,也没有地形影响修正方法。针对山区地形地表类别不易确定,风环境复杂这一问题,结合山西省禹门口黄河斜拉桥这一实际工程,利用自行开发的桥梁风场特性分析系统对桥址处一年多实测风速数据进行分析计算,得到了桥址处平均风速和风向、湍流度、湍流积分尺度、功率谱密度等强风特性,并将分析结果与FLUENT的数值模拟结果进行对比,验证了程序的可靠性和有效性,为主桥风洞试验及颤振、抖振分析和结构分析时风荷载计算提供了依据。
At present, the construction of long-span bridges across complex valleys and other complex terrains is increasing. However, the existing wind resistance norms have no clear rules for the calculation of the topographic wind velocity profiles in complex mountainous areas and there are no corrections to the terrain effects. Aiming at the problem that mountain topography is not easy to be identified and the wind environment is complex, combined with the actual project of Yumenkou Yellow River cable-stayed bridge in Shanxi Province, the self-developed bridge wind field characteristics analysis system is used to analyze wind velocity data of more than one year at bridge site The wind speed, wind direction, turbulence degree, turbulent integral scale and power spectral density at the bridge site are obtained by analysis and calculation. The results of the analysis are compared with the numerical results of FLUENT, and the reliability and validity of the program are verified. Wind tunnel test for the main bridge and flutter, chattering analysis and structural analysis provide a basis for wind load calculation.