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Commercial Sign structure

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I am designing a  commercial sign where  a steel open frame tower
10'x10' with four legs and 90' tall supports a 30' high x 50'wide
billboard  like a cantilever beam.  The billboard  is framed with
several horizontal trusses connected to the four legs
of the tower. The wind load on the  billboard  produces  a large
torsional force on the tower.



                                    50'
                      nnnnnnnnnnnnnnnn
               30'     n
n                                                  50'
                      nnnnnnnnnnnnnnnn
xxxxOxxOxxxxxxxxxxxxxx
                         n
n                                            10'   x      x     x
x      x     x
                         n
n
xxxxOxxOxxxxxxxxxxxxxx
                         n    n 60'
                         n
n                                                                 Plan
                     __n__n __

                        Elevation


I am using RISA 2D only.  How do you create a 2D model for the open
frame tower taking into account the torsional forces from the billboard?
Is it possible to do this or do you need 3D analysis?

Thanks in advance.


Alex Nacionales, CE
anacio(--nospam--at)skyinet.net