-
|
Hi there Does pynite do buckling analysis? If not, is there any plans to include it? Regards |
Beta Was this translation helpful? Give feedback.
Replies: 2 comments 7 replies
-
|
Yes and no. Not in the traditional sense of using an eigenvalue analysis to determine buckling modes. But yes if you are modeling buckling via the Direct Analysis Method using P-Delta/P-delta analysis. Frankly - the latter method is the method recognized by most modern building codes. Any analysis of buckling should consider fabrication imperfections, residual stresses, out-of-plumbness, and geometric non-linearity. Those eigenvalue analyses can be misleading. See the link below for more detail about how P-Delta/P-delta works in Pynite. |
Beta Was this translation helpful? Give feedback.
-
|
Haha, just saw @JWock82 comment saying the same thing 😅. Sorry! |
Beta Was this translation helpful? Give feedback.
-
|
Don’t be sorry at all. Always good to have a second opinion. |
Beta Was this translation helpful? Give feedback.
-
|
I am using Australian standard AS4100. As far as I know, unfortunately, it doesn't say anything about direct analysis. |
Beta Was this translation helpful? Give feedback.
-
|
I don’t have access to AS 4100, but I just did a quick Google search. It looks like it might be under Second-Order P-Delta Linear, Elastic Analysis in AS 4100 4.4.1.2 and/or Appendix E. It might have a different name in that code. Look for code provisions that require you to account for material imperfections (usually by reducing E about 20% during analysis), erection tolerances (via small notional loads), and P-Delta and P-little-delta effects. |
Beta Was this translation helpful? Give feedback.
-
|
As an alternative you can always use tables or, for more complex systems, alignment charts, to find K. |
Beta Was this translation helpful? Give feedback.
-
|
Have a look at this link: So You Want to Use K-Factors Do You? - AISC Webinar When using the Direct Analysis Method, you are essentially modeling the buckled geometry, allowing you to use K=1.0. |
Beta Was this translation helpful? Give feedback.
Yes and no. Not in the traditional sense of using an eigenvalue analysis to determine buckling modes. But yes if you are modeling buckling via the Direct Analysis Method using P-Delta/P-delta analysis. Frankly - the latter method is the method recognized by most modern building codes. Any analysis of buckling should consider fabrication imperfections, residual stresses, out-of-plumbness, and geometric non-linearity. Those eigenvalue analyses can be misleading. See the link below for more detail about how P-Delta/P-delta works in Pynite.
https://pynite.readthedocs.io/en/latest/PDelta.html