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基于ANSYS FLUENT12.0,采用任意拉格朗日-欧拉(ALE)方法和弱耦合方法搭建了求解气动弹性问题的数值计算模型,提出了零风速下桥梁断面气动力的理论表达式,模拟了薄平板断面和大贝尔特桥主梁断面在零风速下的自由振动响应.基于所提出的气动力模型识别出了相应的气动力系数,进而计算出模型的振动频率和阻尼比,并分析了气动力对零风速下桥梁断面的自由振动响应的影响.结果表明:零风速下模型在振动时,对周围空气的干扰作用最小的是侧弯,其次是扭转,最大的是竖弯.当模型在竖弯振动时,若忽略周围空气的气动干扰作用,将会带来较大的误差.
Based on ANSYS FLUENT12.0, a numerical model for solving aerodynamic elastic problems was established by using arbitrary Lagrange-Eulerian (ALE) method and weak coupling method. The theoretical expression of the aerodynamic forces of bridges at zero wind speed was proposed. Thin slab section and the large Bertel bridge girder section at zero wind speed.According to the proposed aerodynamic model to identify the corresponding aerodynamic coefficient, and then calculate the model of the vibration frequency and damping ratio, and analyzed Aerodynamic force on the free-vibration response of the bridge section under zero wind speed.The results show that the model with the minimum wind speed is the side bending, the second is the torsion and the second is the vertical bending when the model is under zero wind speed.When the model Vertical vibration in the vertical, if ignored air aerodynamic interference, will bring greater error.