山区复杂地形下高墩多跨连续铁路钢桁梁桥的风场特性研究  

Numerical simulation of wind field for high-pier truss girder continuous bridges at complex terrain

作　　者：吴广 WU Guang(China Railway and Construction Major Engineering Group Co.,Ltd,Tianjian 300308,China)

机构地区：[1]中国铁建大桥工程局集团有限公司,天津300308

出　　处：《铁道科学与工程学报》2019年第1期129-136,共8页Journal of Railway Science and Engineering

基　　金：铁道部科研计划资助项目(2016030)

摘　　要：以在建的蒙华铁路三门峡黄河公铁两用大桥为工程背景,研究复杂山区桥址的风参数问题。采用中国科学院地理信息的高精度地形,通过逆向工程软件拟合出桥址地形曲面。通过形成以该曲面为底面的长宽高分别为100,100和20 km的计算域并实施网格划分,采用大涡模拟(LES)数值模拟不同来流条件下计算域内的流动特征,重点分析各风向角下桥轴线上平均风特性、湍流度和风攻角等参数。数值仿真表明:与远方来流风速相比,桥轴线上部分位置处的风速增加可达到20%,但是沿桥轴线平均的风速并不存在加速效应,因此,平均风速取值无需考虑加速效应。地形效应附加的风攻角在1°～2°左右。In this study,the wind field at the Sanmenxia Bridge carrying both railways and highways was investigated by large eddy simulation.The high-precision terrain data at discrete locations was first obtained in Geospatial Data Cloud,and the discrete data was processed with the Imageware to form a smooth terrain surface from which the grids were generated.A computation domain with 100 km long,100 km wide and 20 km high was employed for numerical simulation,and the wind field within the computational domain was numerically simulated with LES turbulence model.The mean wind velocity,turbulence intensity,and wind attack angle at different incoming wind condition were obtained.Compared to the incoming flow velocity,a 20%speed-up of mean wind velocity is observed at several locations along the bridge axis.However,the mean wind velocity averaged over the bridge axis don't have speedup effect,which imply no additional correction is necessary for choosing the design wind velocity.The supplemental wind attack angle is about 1°~2°.

关 键 词：风场特性 LES 山区桥梁 数值模拟 

分 类 号：U441[建筑科学—桥梁与隧道工程]