Does Robot provide both P-Δ and P-δ analysis?

[raried]

Hi,

See attached image that shows difference between P-DELTA and P-delta.

The AISC 360-10 code requires both are accounted for in the design unless the P-δ can be shown to be negligible (which I am studying on my current project now). Curious to know if Robot can do this anyway. I have looked through the analysis type parameters, the forum and google searches and have not found an answer. Any help appreciated, Regards, Rob

[Rafal.Gaweda]

See this thread:
http://forums.autodesk.com/t5/robot-structural-analysis/non-linear-analysis-p-delta-analysis/m-p/364...

[raried]

Hi Rafal,

Thanks for your quick response.

I have read through those links (actually read before posting). You're right. The beam with fixed supports does indicate that P-δ is included.

So I cannot choose between 1 and 2 below as Robot does 1 as standard. Is that correct?

1. P-Δ and P-δ

or

2. P-Δ

Many thanks, Rob

[Rafal.Gaweda · Accepted solution]

P-δ

http://forums.autodesk.com/t5/robot-structural-analysis/geometric-non-linear-analysis/m-p/4429461#M1...

[raried]

Further question. From the diagram shown on this page:

http://knowledge.autodesk.com/support/robot-structural-analysis-products/learn-explore/caas/CloudHel...

And the comment on this page:

http://forums.autodesk.com/t5/robot-structural-analysis/non-linear-analysis-p-delta-analysis/m-p/364...

regarding needing more nodes along beam for increased accuracy.

If I have a space frame with nodes only at framed locations (i.e. no nodes along the length of the individual members) would this effectively be P-Δ only?

Rob

[raried]

Thank you Rafal, that link answers my question.

Rob

[Rafal.Gaweda]

If I have a space frame with nodes only at framed locations (i.e. no nodes along the length of the individual members) would this effectively be P-Δ only?

Yes.