摘要
为研究山区地形对处于峡谷中桥梁风场特性的影响,以建设在某峡谷中的一座大跨度桥梁为研究背景,利用计算流体力学软件FLUENT,设计了数值模拟方法,对桥址处风场进行计算分析.在利用实验数据验证模拟方法可靠性的基础上,通过不同来流方向的计算结果,分析了山区地形对主梁上顺桥向和横桥向的风速、风攻角及桥位处的平均风剖面分布的影响,以及峡谷效应产生的风速放大系数.研究结果表明:桥位来流方向的高耸山体会影响该侧主梁上水平风速的分布,并在该侧产生向下的风攻角;峡谷内的风剖面下部会发生畸变;特定的来流方向会在跨中产生风速放大效应.
The influence of topographic features of mountainous area on the wind field distribution at bridge sites was investigated with a computational fluid dynamics software FLUENT by taking a long- span bridge crossing a deep valley as an engineering example. The simulation method was verified by comparing the numerical results with ones obtained from the wind tunnel testing. Through comparative analysis of cases with different wind directions, the distribution characteristics of wind velocity, wind attack angle and mean wind profiles at the bridge site under different flow directions were studied, and also the magnification factors caused by the effect of valley wind were discussed. The results show that the wind velocity distribution and wind profiles along the bridge deck would be influenced by the nearby mountains, and downward wind attack angle appears on this side; distortion of wind profile would happen at the lower part of the valley ; and wind velocity accelerations would happen at the midspan when the wind flow direction is aligned with the valley.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2016年第4期654-662,共9页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(51478402)
关键词
山区地形
深切峡谷
大跨度桥梁
桥位风场
数值模拟
mountainous area
deep valley
long-span bridge
wind field
numerical simulation
