高架栈桥断面气动导数的数值识别

Numerical simulations for aerodynamic derivatives of trestle bridge deck

为了缩短高架栈桥的设计周期并降低成本,采用CFD技术计算桥梁的气动导数。应用CFD方法研究了某型高架栈桥断面绕流场,用强迫振动法结合动网格生成技术识别了栈桥断面的气动导数。各折算风速下的高架栈桥气动导数计算值与Theodorsen理论值大小相近,变化趋势相似,在苏通大桥断面的气动导数计算中,本方法也取得了较好的效果。结果表明,使用强迫振动法结合动网格技术识别高架栈桥气动导数是可行的,为该型栈桥设计时考虑风载的影响提供了一种新的方法,可作为风洞试验的一种有力的辅助工具。

In order to shorten the designing time and the lower the testing cost,Computational Fluid Dynamics technique was used to analyze the attribution of wind field around the trestle bridge.Aerodynamic derivatives of the trestle bridge deck were identified by using the forced-vibration method and the moving-mesh technology.Under different converted wind speeds,aerodynamic derivative values of the elevated trestle from calculation and from Theodorsen theory,which are close to each other,have similar change trends...