山区峡谷桥梁抗风设计风速的确定方法  

Determination Method for Wind-resistant Design Wind Speed of Mountainous-valley Bridge

作　　者：庞加斌[1] 宋锦忠[2] 林志兴[2] 

机构地区：[1]同济大学汽车学院,上海200092 [2]同济大学桥梁工程系,上海200092

出　　处：《中国公路学报》2008年第5期39-44,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金重点项目(90715031);国家西部交通建设科技项目(200431800028)

摘　　要：首先通过分析四渡河峡谷大桥桥位周边地区标准气象站的基本风速数据,拟合基本风速和海拔的变化关系,用海拔修正确定山区峡谷大桥的基本设计风速;然后通过地形模型风洞试验研究影响山区峡谷风速的主要因素。结果表明:山区峡谷风速主要受峡谷风、越山风和遮挡三大类地形效应影响,相应风向的设计风速大小可用地形系数修正;山区峡谷桥梁的设计基本风速受海拔影响很小,随着海拔增高,基本风速略有增大;山区峡谷桥梁的抗风设计风速等于桥位的基本风速乘以地形修正系数,而平坦地貌的平均风速剖面模型已不再适用。First, through analysis of the basic wind speed data from the standard meteorological observatory stations around Siduhe Valley Bridge site, the variational relationship between basic wind speed and the altitude beight was fitted. The basic design wind speed of tbe mountainousvalley bridge can be determined by using altitude beight correction. Then. by using topographic model wind tunnel experiment, the main factors of influencing wind speed in mountainous valley was studied. Results show that the wind speed wind. over hill wind and the shielding effects. by topographic correction coefficients. The resistant affected by altitude height design is in mountainous valley is mainly affected by valley Corresponding effect wind speed can be corrected basic wind speed for mountainous valley wind rather weakly. With the altitude increasing, the basic wind speed increases slightly. The wind-resistant design wind speed for mountainous-valley bridges equals to the product of basic wind speed and topographic correction coefficient. While, the mean wind speed profile models for homogenous terrain are not applicable .

关 键 词：桥梁工程 山区峡谷桥梁 风洞试验 抗风设计风速 地形修正系数 遮挡效应 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]