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Modeling a 3D truss

Modeling a 3D truss

Modeling a 3D truss

(OP)
I am trying to model a 3D truss in STAAD.  The forces in the members do no match the hand calculations I was given.  Does anyone have any ideas why they aren't matching up?  (I tried to model the truss by specifying the diagonal bracing as truss members.)

RE: Modeling a 3D truss

Is this truss a true 3D truss such as a space frame or is it really a 2D plane truss with top and bottom chord bracing diagonal bracing to the adjacent trusses on each side?

If it the latter, then why are you modeling the braces?

RE: Modeling a 3D truss

(OP)
My truss is like a space frame.

I am relatively new to using STAAD, so any advice you have is greatly appreciated.  Thank you!

RE: Modeling a 3D truss

You might want to check out the STAAD example problems with space frames. Open the Help file and search "space frame".  There are a few examples.

Steve

RE: Modeling a 3D truss

Most truss examples in textbooks have one end support as a roller and the other end support pinned. Be sure you are using the same boundaey conditions.

RE: Modeling a 3D truss

Maybe you've been using self-weight load... Sometimes this let your model not matching hand calculations!

Alessio Spigarelli
Structural Engineer

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