For the transmission line tower with a big span

the ice formed by frozen rain coating on transmission line will arouse system response

which is liable to cause dynamic collapse of the tower-line system.Although some achievements have been obtained at present on the research of power transmission tower vibration under ice load

further efforts need to be made in order to acquire dynamic properties of power transmission tower on the same loading condition.In this paper

an analytical-numerical model of long-span transmission tower-line system is founded based on an actual project.The influence of meshing precision of transmission line finite element model on the dynamic properties of transmission tower-line system is analyzed

and analysis of dynamic properties of the system with iced transmission line is carried out.It is shown from the results that mesh accuracy of transmission lines has an obvious effect on dynamic properties of power transmission tower.Additionally

ice coating on transmission lines affects not only natural frequency of transmission tower-line system but also the mode shapes

especially vibration of cross-arms.