CFD在桥梁断面静力三分力系数计算中的应用  

APPLICATION OF CFD IN CALCULATING STATIC COEFFICIENTS OF BRIDGE SECTION

作　　者：谭红霞[1,2] 陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,湖南长沙410082 [2]湘潭大学土木工程与力学学院,湖南湘潭411105

出　　处：《工程力学》2009年第11期68-72,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50478051)

摘　　要：采用CFD软件CFX模拟了风对桥梁的静力作用,计算了广州白沙河大桥拱肋断面和主梁断面?3o、0o和+3o风攻角情况下的静力三分力系数,并与风洞试验数据进行了比较。结果表明:用CFX数值模拟的计算结果与风洞试验结果基本吻合,各攻角情况下拱肋断面的阻力系数的误差分别为3.5%、1.3%、3.8%;对于主梁断面,0o攻角的三分力系数的误差分别为4%、2%、3%,而+3o攻角的阻力系数和升力矩系数的误差分别为0.1%和0.6%,可见CFD能够较为精确地模拟计算出桥梁断面的静力三分力系数。Taking BAI SHA Bridge in Guangzhou as an example, aerodynamic force on the bridge is simulated by CFX, and then, the static force coefficients of the arch section and main beam section are obtained under -3 °, 0° and ＋3° attack angle. Comparing calculation results with experimental results from wind tunnel test, it is found： 1） the difference in the resist coefficient of arch section is 3.5%, 1.3% and 3.8% respectively under the three attack angles; 2） the difference in the static force coefficients of main beam is 4%, 2% and 3% respectively under 0°attack angle; 3） the difference in the resist coefficient and ascend coefficient is 0.1% and 0.6%. Therefore, aerodynamic force Coefficients of bridge section could be simulated accurately by CFD.

关 键 词：桥梁 静力三分力系数 CFD 数值模拟 风洞试验 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]