基于CFD的双幅桥梁气动干扰效应数值仿真  

Numerical Simulation on Aerodynamic Interference Effects of Twin Deck Bridges Based on CFD

作　　者：李黎[1,2] 叶醒[1,2] 李素杰[1,2] 彭元诚[3] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点实验室,湖北武汉430074 [3]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《湖北工业大学学报》2013年第2期9-14,共6页Journal of Hubei University of Technology

基　　金：贵州省交通厅科技项目资助;中央高校基本科研业务专项资金(2011QN181)

摘　　要：与孤立的单幅桥主梁相比,双幅桥梁的主梁气动特性发生改变,这在桥梁抗风设计中不容忽视.针对此问题,基于计算流体力学方法,以主跨径290m、最大墩高141m的北盘江特大桥为工程背景,对双幅桥主梁三分力系数气动干扰效应进行了数值仿真分析.首先,采用FLUENT建立了主梁和流域计算模型,并与风洞试验进行对比,验证模型及计算方法的准确性;然后,改变主梁间距、风速和风攻角等参数,研究其对双幅桥主梁三分力系数干扰效应的影响,得到了气动干扰因子随风速变化的曲线.研究结果表明:下游主梁气动干扰效应比上游主梁显著;主梁间距越小气动干扰效应越大;风攻角和风速对气动干扰效应有着复杂的影响.The aerodynamic characteristics of the main girder of twin deck bridge are different compared with the isolated single deck bridge, which can not be ignored during wind resistance design. For this rea- son, the numerical simulation of aerodynamic interference effects between main girders of twin deck bridg- es, in the background of the 290m main span and 141m pier height Beipanjiang Grand Bridge, was opera- ted based on the computational fluid dynamics （CFD） methods in this paper. First, the models of main girder and flow fields were established with FLUENT and the numerical simulation results were contrasted to the wind tunnel test results to verify the validity of the models and methods adopted by this paper. Then, the values of such parameters as girder clearance, wind speed and wind attack angle were changed to investigate their influences on aerodynamic interference effects of aerostatic coefficients and the curves of interference factor following the wind speed variation were drawn at last. The results of the study show that the aerodynamic interference effects of leeward girder are more remarkable compared with the wind- ward girder and the aerodynamic interference effects amplify as the girder clearance decreases; the wind speed and wind attack angle also affect the aerodynamic interference effects intricately.

关 键 词：双幅桥梁 气动干扰 计算流体力学 三分力系数 数值仿真 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]