Structural safety of transmission towers is directly related to the reliability of the state grid.In fact

wind loading is taken as one of the main harmful factors.Until now

how to consider the tower-line coupled problem in dynamic response analysis has not been fully resolved

although many researchers have studied this problem.In this paper

based on typical transmission tower design in a 500 kV transmission line

a finite element model of a multi-tower-line coupled system

including three towers and two-span lines

is established using the development environment of international finite element method program ANSYS. Then

the classical spectral representation method based on power spectrum density functions is applied

and Davenport spectrum is used to generate wind speed histories of a given field.Finally

this generated wind field is applied in wind-induced dynamic response analysis of the coupled system

and the dynamic response results of the middle transmission tower in the above coupled system are compared with quasi-static analytical results of the solo tower.It is found that the horizontal displacement response of the tower top increases 9% and the increment of axial compressive stress of some elements can reach 84.6%.It can be concluded that the results by the current wind resistant design method for the transmission towers are unreliable and the design method needs to be modified.