The effect of wind pressure is more predominant on
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can only think that as most transmission towers stand up to whatever Mother Nature throws at them it would need to be an exceptional weather event that caused several towers to collapse in South Australia recently. The towers do have a reasonable surface ares that would received the force generated by any constant wind. It would also have the forces at the suspension point generated by the wind on the transmission lines. The transmission towers have flat surfaces whereas the transmission lines are circular. Then there is the possibility of the wind being just at the right speed to cause the towers to oscillate a t a resonant frequency that caused catastrophic failure in a very short time. That is as far as my knowledge can help me. I have never seen an example of what happened in South Australia, and there is no video camera recording of that incident.
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