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Re: Guyed Tower

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Guy wires must be modeled as "Tension" member with pin connections at tower 
end.  However, at the ground end it should be fixed because of unsymmetrical 
load condition.  StaadPro gives reasonable results.
A better analysis is obtained using MSC NASTRAN and performing a "NONLINEAR" 
analysis.
There is a "TOWER" software produced in ENGLAND which is best for tower 
analysis.
Beware of wind input which is tricky. "EIA/TIA" code (Tower Design ) requires 
you to check wind in several directions.  Some of these codes are outdated 
and wind forces are based on "Fastest Mile" data which have not been 
collected in last 10 years.  Use ASCE 7-95 to calculate wind force inputs.
I hope this helps some.
L.H.K.Sharan, P.E.