摘要
为考虑复杂地形地貌区大跨度桥梁不同构件处风特性的差异,在对地区相关气象站历史实测风速资料进行统计分析的基础上,推算了地区基本风速.通过对地区气象站和桥位风速观测点同步实测风速资料相关性的分析,建立了桥址区风速与地区气象台站风速间的订正关系.基于桥址区地貌特征并结合CFD分析结果,确定了主梁及各桥塔的设计风速,提出了复合风速标准的概念.研究结果表明,与常规桥梁单一的风速标准不同,深切峡谷区大跨度桥梁宜采用考虑主梁及各桥塔风特性差异的复合风速标准.
To consider the difference of wind characteristics for different members of a long-span bridge in complex terrains,the basic wind speed for the region was calculated on the basis of the statistical analysis of historical observation records of wind speed from meteorological stations involved.From the simultaneous observation data from the meteorological stations and observation points in a bridge site,the revision relationship between wind speeds at the bridge site and at the meteorological stations was established by the analysis of correlativity.By considering the terrain feature of the bridge site and combining the results of computational fluid dynamics analysis,the design wind speeds were determined for bridge deck and each pylon,and the concept of integrated wind speed standard was presented.The results show that the integrated wind speed standard instead of the uniform wind speed standard takes the differences among wind characteristics for bridge deck and each pylon into account,and it is fit for long-span bridges over a deep-cutting gorge.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2010年第2期167-173,共7页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(90915006)
教育部新世纪优秀人才支持计划资助项目(NCET-06-0802)
四川省杰出青年学科带头人计划资助项目(2009-15-406)
关键词
大跨度桥梁
复杂地形
桥址区
相关性
复合风速标准
long-span bridge
complex terrain
bridge site
correlativity
integrated wind speed standard
