基于CFD对某大跨斜拉桥静力三分力系数研究

Research on Static Three-Component Force Coefficient of A Long-Span Cable-Stayed Bridge Based on CFD

随着桥梁跨径的增大,使得结构变得更轻柔,桥梁结构对风荷载的敏感性也随之增加,而静风三分力系数的计算是抗风研究的基础。目前研究桥梁抗风问题的主要手段是风洞试验,但该试验周期长,而且需要消耗大量的人力和物力,风洞试验无法得到大力推广。本文基于计算流体力学,用CFD软件对某斜拉桥双边箱梁截面进行静态绕流模拟,求出不同风攻角下的三分力系数,以期为双边箱梁截面桥梁抗风研究做出贡献。

With the increase of bridge span,the structure becomes more flexible,and the sensitivity of bridge structure to wind load also increases.The calculation of static wind three-component force coefficient is the basis of wind resistance research.At present,the main method to study the wind resistance of bridges is the wind tunnel test,but the test period is long and requires a lot of manpower and material resources,so the wind tunnel test cannot be vigorously promoted.Based on computational fluid dynamics,this article uses CFD software to simulate the static flow around a bilateral box girder section of a cable-stayed bridge,and obtains the three-component force coefficient under different wind attack angles,in order to contribute to the research on the wind resistance of the bilateral box girder section bridge.