Staad pro Electrical transmission tower modeling tutorial-hindi/english
Tower Design (this is from Nptel)
Once the external loads acting on the tower are determined, one proceeds with an analysis of the forces in various members with a view to fixing up their sizes. Since axial force is the only force for a truss element, the member has to be designed for either compression or tension. When there are multiple load conditions, certain members may be subjected to both compressive and tensile forces under different loading conditions. Reversal of loads may also induce an alternate nature of forces; hence these members are to be designed for both compression and tension. The total force acting on an individual member under the normal condition and also under the broken- wire condition is multiplied by the corresponding factor of safety, and it is ensured that the values are within the permissible ultimate strength of the particular steel used.