Abstract: Aerodynamic interference effects between the windward and the leeward deck of twin-deck were simulated by computational fluid dynamics( CFD) method through Fluent． Results indicate that due to the shelter effect，static component coefficient of rear axle was greatly influenced; resistance coefficient reduced by 74% compared with single bridge; lift coefficient decreased by 88%． The aerodynamic interference effect decreased gradually with rear axle space increasing; when space reached 8b ( b was the ratio of beam height and double deck bridge space) ，there remained certain aerodynamic interference phenomenon，which could not be ignored．

Key words: twin decks, aerodynamic coefficients, aerodynamic interference, numerical simulation

摘要： 采用计算流体动力学( CFD) 的方法，利用Flunet 软件对某双幅桥面桥梁三分力系数的气动干扰效应进行数 值模拟。结果表明: 由于前桥对后桥的遮挡作用，后桥的静力三分力系数受到较大影响，阻力系数与单桥相比减小 了74%，升力系数减小了88%; 随着前后桥间距的增大，双幅桥梁之间的气动干扰效应逐渐减小，但双幅桥面达到 8b( b 为梁高与双幅桥间距的比值) 间距时仍存在一定的气动干扰现象，不可忽视。

关键词: 双幅桥面, 三分力系数, 气动干扰, 数值模拟