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Transmission Line Tower Foundations

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Transmission tower towers are designed with "overload factors" (which 
differ for different loading conditions and tower type, and range from 1.0 
to 2.54) using the allowable stresses prescribed specifically for 
transmission line towers. The ASCE Manual No.52 is the reference, in my 

My question is regarding the design of tower foundations. Are we supposed 
to further multiply the tower reactions (already multiplied with overload 
factors) with additional load factors  (such as 1.4 and 1.7) prescribed by 
the concrete codes? Also what would be strategy while checking stability 
against uplift?

I would be extremely grateful for a prompt reply.

Rizwan Mirza