The Transmission Tower with Angles Composed by the Variable Cross-Section is Studied Modal Analysis and Secondary Stress

In order to study the mechanical properties of the angle variable cross-section transmission tower against the corner of a 500kV transmission line tower, it becomes a node by node plate tower slope at a single angle and dual angle connected to a total of ten bars, dozens of bolts. The entire tower was built finite element model, the model is modal analysis, the results of the analysis of compliance with regulatory requirements. In the most unfavorable conditions, the tower each node variable slope rod internal forces are extracted, come times of stress accounted main material angle of principal stress ratio is large, need to be considered in the design.