Abstract: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.