山西禹门口黄河大桥实测风特性分析  

Analysis of Field Measurement of Wind Characteristics on Yumenkou Yellow River Bridge in Shanxi Province

作　　者：张玥[1,2] 胡兆同[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,西安市710064 [2]西安科技大学建筑与土木工程学院,西安市710054

出　　处：《公路》2008年第11期77-82,共6页Highway

摘　　要：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 study on the characteristics of natural wind are the base of wind-resistant design of bridges. Considering the phenomenon that the study on field measurement of turbulence characteristics has not yet been developed and combining this actual engineering--Yumenkou Yellow River Bridge in Shanxi Province, an 60 m height wind observation tower and two 30 m ones are established on the bridge site to get wind gradient datas. Using the personal developed program, the measured wind data are analyzed in this paper to obtain the mean wind velocity and direction, wind profile, turbulence intensity, gust factor. The result of analysis shows that the wind field of bridge location is complex and not completely suit power exponent distribution; the probability of wind velocity greater than 28.3 m/s is high, so wind tunnel test of anti-wind performance in its cantilever construction stage should be done to ensure cantilever construction security; long-term observation on the field should be done to get more detailed data for learning characteristics of wind fields on the similar topography.

关 键 词：风特性观测 风剖面 湍流强度 阵风因子 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]