基于等效刚度的输电杆塔简化方法研究

本文提出了一种基于等效刚度的输电线路杆塔简化等效方法，并利用算例验证了该方法的正确性。基于ABAQUS有限元软件，采用本文提出的简化等效方法、精细化杆梁混合模型以及传统固定约束等效方法分别模拟研究了典型大刚度直线塔和小刚度耐张塔在舞动条件下的动态响应。模拟结果表明：对于刚度较大的输电杆塔，三种等效方法模拟得到的舞动垂直位移、水平位移、扭转角度和振动频率结果十分接近，误差不超过3.3%；而对于刚度较小的输电杆塔，本文提出的等效方法与精细化杆梁混合模型研究获得舞动幅值、振动频率同样十分接近，最大误差不超过10%，而传统的固定约束方法的扭转角度最大误差达到60.58%。因此，本文提出的等效刚度方法能准确有效反映出杆塔对导线振动特征的影响，可用于各种动载条件下导线动态响应特征的快速简化研究。

Study on transmission tower simplification method based on equivalent stiffness

In this paper, a simplified equivalent method of transmission line towers based on equivalent stiffness is presented, and the correctness of the method is verified by an example. Based on the finite element software ABAQUS, the simplified equivalent method in this paper, the meticulous mixed truss and beam model and the traditional method of fixed constraint equivalent were adopted to simulate the dynamic response of typical intermediate tower and tension tower under dancing conditions. For transmission towers with large stiffness, the results of vertical displacement, horizontal displacement, torsion angle and vibration frequency simulated by the three equivalent methods were very close, with an error of less than 3.3%. For transmission towers with small stiffness, the galloping amplitude and vibration frequency by the equivalent method proposed in this paper were very close to these obtained by the refined mixed model of pole and beam, with the maximum error no more than 10%, while the maximum error of torsion angle simulated by the traditional fixed constraint method up to 60.58%. Therefore, the equivalent stiffness method proposed in this paper can accurately and effectively reflect the influence of tower on the vibration characteristics of the conductors, and can be quickly used to study the influence of dynamic response characteristics of the line under various working conditions.