山区峡谷大跨度桥梁桥址风场试验  

Experiment of Wind Field in Long-span Bridge Site Located in Mountainous Valley Terrain

作　　者：徐洪涛[1] 何勇[1] 廖海黎[2] 马存明[2] 鲜荣 

机构地区：[1]北京交科公路勘察设计研究院,北京100088 [2]西南交通大学风工程试验研究中心,四川成都610031 [3]广东省公路建设有限公司,广东广州510600

出　　处：《公路交通科技》2011年第7期84-89,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50808148)

摘　　要：坝陵河特大桥位于地形特殊的山区,桥址风环境非常复杂,是我国西部山区桥址的典型代表,为了正反映桥址处风的实际状况,探索通过地形模拟风洞试验来确定桥梁设计基准风速和相关的风特性参数的方法和可靠性,为将来类似桥梁提供参考。试验研究结果表明:坝陵河特大桥在横桥向来流作用下,跨中桥面高度处风速受到"峡管效应"的增速作用;峡谷内平均风剖面的分布具有明显的不均匀性,桥面高度处平均攻角范围为±4.7°,高于规范要求的±3°;桥面高度处的水平和竖向脉动风速功率谱与规范谱在高频区吻合较好,在低频区有较大差别,本文采用较为接近的Von Karman脉动风速功率谱。Baling river grand bridge is located in special mountainous area with very complicated wind field which is the representative case in west China.The particular terrain model,which can simulate the practical status of wind field in bridge site,was tested in wind tunnel to confirm the design norm wind speed and the related wind characteristic parameters to give reference to future similar bridge designation,and the test method was researched to identify the correctness and reliability at the same time.The test result shows that（1） the wind speed increases obviously at the height of mid-span girder because of the effect of narrow under cross wind;（2） the distribution of wind profile is nonuniform,the average attack angle range is ±4.7° degree,obviously lager than the required ±3° in criterion;（3） the power spectra of lateral and vertical fluctuant wind speeds at the high frequency part are close to those listed in criterion,while there exists clear difference at low frequency part.The Von Karman fluctuant wind speed power spectrum was used in this research.

关 键 词：桥梁工程 风场 地形风洞试验 山区峡谷 桥址 风荷载 

分 类 号：O35[理学—流体力学] U44[理学—力学]