输电塔线体系中覆冰导线舞动数值模拟研究

Numerical simulation for galloping of iced conductors in a transmission tower-line system

利用ABAQUS有限元分析软件,建立输电线塔线耦合体系非线性有限元模型,对覆冰四分裂导线舞动进行数值模拟,获得塔线体系中各相导线舞动轨迹、振动幅值、频率特性等。经分析比较发现,杆塔变形对导线舞动轨迹与幅值影响明显,而对舞动响应频率特性影响较小。导线舞动过程中导线与杆塔应力响应表明,其最大应力均小于材料强度极限,因此导线舞动造成的导线断裂及杆塔破坏应以疲劳破坏为主。

Nonlinear finite element model of a transmission tower-line system was set up and galloping of iced quad bundle conductors in the system was numerically simulated by means of ABAQUS software. Based on galloping trajectories, vibration amplitudes and response frequency characteristics of iced conductors, it was shown that the deformation of towers in the system greatly changes trajectories and vibration amplitudes, but it has a little effect on frequency characteristics of galloping responses; the maximum stresses of conductors and towers during galloping are smaller than the material ultimate strength, so the failure of conductors and towers induced by galloping is usually a fatigue one.