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Re: commercial sign structure

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>     ASCE 7 is available from ASCE at 1-800-548-2723 or
>     On the analysis part of your question, torsion in a 4 sided truss 
>     tower can be approximated by resolving the moment portion into 
>     reactions on the 4 sides rotating about the center of stiffness, 
>     probably the tower center.  

        You can eliminate the torsion by adding diagonals across the center
of the four frames to form a truss internal to the perimeter ones if you do
not need the center to be open.

Just an idea.
Norb Volny PE