Buckling deformation in use Robot Structural Analysis Professional

[Gotzman]

Hello, colleagues!

I want to continue the theme of the affected here in this thread http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Non-linear-analysis-P-delta-analysis/td-p/36...

1. choice of combinations to analyze the overall stability, it is necessary to form some by what criterion

2. selection criteria buckling

3. which depend on the coefficient of participation buckling

4. how and to what standards are specified here these maximum strain

5. that means random deformations. the robot detects them and do not take into account.

6. whether to form a pairing of buckling? if so by what rule?

Correctly I understand the use of this function?

7. Only rod systems?
8. Before use, creating loads of promptness?
9. Analyze the overall sustainability?
10. Run the last tab for each combination ask determining buckling (as she choose?)
11. Get the length of the robot ispol machine design process?

P.S. You can please reply with detailed case studies and references Eurocodes 3 ?

[Pawel.Pulak]

Buckling Deformation was implemented as the feature not related to any specific code.

The description is given in this help topic.

It contains the following note: "This option applies only to bars; you cannot use it for shell or solid elements."

"Buckling deformation" help topic contains also the information concerning the possible combining of  more than one buckling modes.

As concerns using thise feature in relation to some specific code: for instance "maximum displacement" in Buckling Deformation" tab may be identified with eta_init from the formula (5.9) in p. 5.3.2(11) of EN 1993-1-1.

Regards,

[YarUnderoaker]

Hi Gotzman.
As far as you progress in this matter?
Did you try to calculate eta_init ?

[YarUnderoaker]

I found this simple example

But it require second derivative of the elastic critical buckling mode. I think this is not possible in Robot.