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自然风特性研究是桥梁抗风设计的基础,但是目前国内对大气湍流特性的现场观测研究工作开展得还极少,针对这一情况,结合山西省禹门口黄河公路大桥,在桥址处建立了一座60 m和两座30 m的风观测站。利用自行编制的程序对实测风速数据进行了分析,得到了平均风速和风向、风剖面、湍流强度和阵风因子等强风特性。分析结果表明:桥位处的风场比较复杂,风剖面属于山区风速剖面,不完全遵守幂指数分布;桥位处出现28.3 m/s大风机率很大,应进行主桥最大双悬臂状态抗风安全性能的风洞试验,以确保主桥悬臂施工期间的安全;还应进行长期观测,得到更多详实资料,为掌握同类地形处的风场特性提供资料。
The research on natural wind characteristics is the foundation of bridge wind resistance design. However, at present, there are few domestic field observations on atmospheric turbulence. In view of this situation, combining with Yumenkou Yellow River Highway Bridge in Shanxi Province, A 60 m and two 30 m wind stations. The measured wind speed data were analyzed by self-programmed program, and the strong wind characteristics such as mean wind speed and wind direction, wind profile, turbulence intensity and gust factor were obtained. The results show that the wind field at the bridge site is rather complicated, and the wind profile belongs to the mountain wind speed profile, which does not comply with the power exponent distribution. The 28.3 m / s wind speed is very high at the bridge site, and the maximum double cantilever wind resistance Safety wind tunnel test to ensure the safety of the main bridge during cantilever construction; long-term observation should also be conducted to obtain more detailed information to provide information on the characteristics of the wind field at the same terrain.