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中文摘要：
采用二维大涡模拟方法对雷诺数为Re=3.73×105的某大跨度斜拉桥主梁断面成桥状态和施工状态三分力系数进行了数值模拟,并与风洞试验结果进行了对比;在此基础上针对防撞护栏对桥梁主梁断面的三分力系数的影响进行了数值模拟和试验研究。结果显示：该桥主梁断面成桥状态、施工状态三分力系数数值模拟结果与风洞试验结果吻合良好。风攻角为α=0°时,主梁断面成桥状态的阻力系数、升力系数、升力矩系数的数值模拟结果比试验结果分别偏小约6.84%、1.39%、7.42%;主梁断面施工状态阻力系数数值模拟结果比试验结果偏小约0.72%,而升力系数、升力矩系数数值模拟结果与试验结果相对误差较大。钢防撞护栏对本文所研究的主梁断面阻力系数的贡献率约为30%左右,而对升力系数和升力矩系数的影响则不明显。
英文摘要：
The aerostatic coefficients of the main girder section of a long-span cable-stayed bridge（Re=3.73×105） with/without barriers were simulated using 2D large eddy simulation（LES）.The numerical simulation result was compared with the wind test result.Furthermore,the effect of barriers on aerostatic coefficients of the main girder section was investigated by numerical and experimental methods.The research results show that（1） The numerical simulation result of aerostatic coefficients of the main girder section agree well with the experimental result.For the attack angle of 0°,the numerical results of the drag,lift and pitch moment coefficients of the main girder section with barriers are less than the experimental results of those by 6.84%,1.39% and 7.42% respectively.（2） The numerical result of drag coefficient of the main girder section without barriers are less than the experimental results by 0.72%,while there are great relative errors between the numerical results and experimental results of lift and pitch coefficients of the main girder section without barriers.（3） The contribution ratio of steel barriers on the drag coefficient of the main girder section is about 30%,while it has no significant effect on the lift and pitch coefficients of the main girder section.
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