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Re: Commercial Sign structure

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In a message dated 98-04-03 09:52:14 EST, you write:

 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?


I wouldn't recommend RISA-2D for this model, as it will not include torsional
effects, even if you break it up into several 2D models. You really need to do
a 3D analysis; also be aware that you need to consider warping stress as well
(in addition to pure  torsional shear) if your legs are not pipe shapes.

Bruce Bates
RISA Technologies