Study on Finite Element Model Construction and Load Response Characteristics of Transmission Tower

In this paper, the digital mechanical model of transmission tower is constructed by finite element method. The node coordinates, layered quadrant number and APDL command flow are established by segments. Beam188 space beam element is used to simulate the angle steel section, and the performance and rigid connection characteristics of Q235, Q345 and Q420 steel are comprehensively considered. The modal analysis shows that the first-order natural frequency of the model is 1.56 Hz, which is consistent with the calculation results of the specification and the theoretical formula. Aiming at the problem that the local vibration mode is too early, the local vibration mode is delayed to the sixth order after strengthening the local stiffness. Under the condition of 396 m span, 21 mm icing thickness and 7 m/s wind speed, the maximum stress is 53.5 MPa (less than the allowable value), and the deformation in the out-of-plane direction is dominant and controllable, which provides a basis for the safety assessment of transmission towers.