| Transmission line is an important project, which plays an importan role in Chinese economical construction. Based on the background of the 220kV large span transmission tower project in Zhoushan, the paper, using finite element method, makes a detailed research on the tower's earthquake-resistant performance and its subsequent performance when insulator ruptures abruptly.Firstly, the FEM model of transmission towers is established.The dynamic properties of transmission line under various wind angle situations, is analysised by delicate FEM model. Two different models to evaluate the effect of FEM on dynamic properties of transmission tower are carried out. By decomposing the effects of transmission line's stiffness and mass on transmission tower, the mechanics of how transmission line influences transmission tower is discussed.Secondly, the conventional seismic response spectrum method is employed to obtain the seismic response on transmission tower. The effect of seismic wave import direction on the transmission tower's seismic responses is analysised by the method. Futhermore, the multi-support response spectrum method is also carried out to obtain the transmission tower-lines coupled system's seismic response.Then, the time domain analysis method is used to explore the relationship between the properties of seismic waves' spectrum and the effect of conductors on transmission towers.The trave effect is discussed on transmission tower-lines coupled system's seismic response.Finally, the transmission line's motion of dropping and transmission tower's dynamic response are observed when insulator ruptures abruptly during the period of a good conditions and earthquakes. |
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