Shape-Thin 9 Analysis of built up cross sections per Eurocode 1993-1-3

[Jovan Andjelkovic]

Hi,

I'm dealing with a portal frame with a built-up cross-section made of two C channels oriented back to back (see attached picture), made of cold-formed steel. I'm wondering, how does this not connected cross-section need to be modeled in the Shape-Thin?

Can RFEM use those results in either check of the cross-section and member in the RF-STEEL EC3 module?

One more thing that I noticed is when I run the calculation for the cross-sections, when the c/t parts and effective cross-section properties module is activated, in the printout report, in the part of section classification for the limit values for section class (λi) there are zeroes, and the cross-section is classified as a class 1 which is not correct.

Kind regards,
Jovan

[Frank Faulstich]

Hi Jovan.

I'm dealing with a portal frame with a built-up cross-section made of two C channels oriented back to back (see attached picture), made of cold-formed steel. I'm wondering, how does this not connected cross-section need to be modeled in the Shape-Thin?

To do this, you need to use null elements. Here is a video that shows how this works:

https://youtu.be/skys2CfVJ0w

In this FAQ you will find more information:

https://www.dlubal.com/en/support-an...ort/faq/002389

Can RFEM use those results in either check of the cross-section and member in the RF-STEEL EC3 module?

Yes, you can.

One more thing that I noticed is when I run the calculation for the cross-sections, when the c/t parts and effective cross-section properties module is activated, in the printout report, in the part of section classification for the limit values for section class (λi) there are zeroes, and the cross-section is classified as a class 1 which is not correct.

Can you please upload the appropriate file here so I can take a closer look.

Frank Faulstich