输电塔线体系导线舞动过程中的振幅和张力

建立3条四分裂线路段塔线耦合体系有限元模型,利用ABAQUS有限元软件对导线舞动过程进行数值模拟,得到各档各相导线舞动过程中的振动幅值和张力变化,将数值模拟结果与现有理论简化公式和经验公式的计算结果进行比较分析。结果表明：导线舞动过程中耐张档的舞动幅值明显大于直线档的舞动幅值,并且认为理论简化公式适用于耐张档的舞动幅值估算。以往所提出的经验公式适用于直线档的舞动幅值估算,以及提出的简化公式可以用于估算导线舞动过程中动张力的变化。此外,导线舞动过程中耐张塔的应力远大于直线塔的应力,特定风速下导线和耐张塔上的最大应力超过其许用应力,可能造成断线和杆塔破坏。

Vibration Amplitudes and Tensions of Conductors during Galloping in Transmission Tower-Line System

The finite element models of three typical transmission tower-line systems are set up by means of ABAQUS software, and the galloping processes are numerically simulated, based on which the vibration amplitudes and tensions of the conductors in different span and different phase during galloping are obtained. Based on the comparison of the numerical results with those determined by the theoretical simplified and empirical formulas, it is found that the simplified formula presented by Hunt and Richards is suitable for galloping amplitude estimation of dead-end span; the empirical formula presented by Lilien and Havard is suitable for galloping amplitude estimation of suspension span, and the simplified formula by Baenziger is suitable for dynamic tension estimation of conductors in both dead-end and suspension spans. Moreover, the stresses in the dead-end towers are larger than those in the suspension towers. The max stresses in the conductors and dead-end towers exceed the allowable stress of materials under some wind speed, which may cause the rupture of conductors and damage of towers.