Steel design - automatic consideration of instability

Hi!

I am trying to figure out the steel design part.
Is there any way to automatically consider the results of buckling analyses / imperfection analyses into the design?

Here is my GH-file. Currently, it only gives utilization ratios for default beta-values equal to 1.0.

LHB_MOTVIKT_UPPSTÖTTNING.gh (57.6 KB)


Try the following.

You will need to manually specify the beta factor but it should work.

Unfortunately, we do not have access in setting the beta factor automatically through the API

Ok! But I am still curious about automizing the design, so I have the following questions (a mix of FEM-Design questions and GH-API questions):

  1. An alternative to the “beta-method” is second order analysis, as you can see in my GH-file, I try to activate 2nd-order analysis, but nothing happens. Am I doing something wrong?
    image

  2. How is the sway-functionality supposed to work? Because it seems like running “Bar” through “BucklingData.SetOnSteelBar” results in much more realistic beta-values than default, however, this is irrespective of if Sway is True/False. Unfortunately, the beta-values are still not reliable in terms of correctness.



  3. One last resort is to use Bar Shell. This is a fantastic function that allows for the consideration of the real buckling lengths. However, it results in some other challanges, which we can maybe discuss later.


ehi @Poja

  1. I can not reproduce the bug related to setting the 2nd order analysis. Can you double check that you are using the latest version of the API?

try to run my file and see it is working as expected.
2ndORder.gh (63.8 KB)


  1. I need to do some research. I will ask to a colleague of mine to help us out
1 Like

@Poja

The sway attribute has effect only when you click on “Automatic beta calculation” but we can not run that “feature” throught the API unfortunately.

You can learn more about the functionality/theory in the following link.

https://strusoftgroup.sharepoint.com/:b:/s/FEM-DesignKnowladgebase/EcVu26gzIxtAh4d7aMSYYV0BVMcVozYHn2UuqkLYhnvHjg?e=aHk8EH