Castellated/perforated/cellular beams in Karamba

Grasshopper Karamba3D
1

Hello,

I would like to analyse castellated/ perforated or cellular beams in Karamba. I could not find any cross section types for it in Karamba. So how can I analyse those beams?

Using 2D analysis in karamba? or is there any other effective solution? Please help!

2

Hello Greatsaiyamandbz,
in my opinion there are to possible approaches with beam-elements:

  1. In case of small openings choose an equivalent web-thickness.
  2. For larger openings use beams which simulate the upper and lower part of the perforated beam and thus constitute a local Vierendeel system. Connect them to the beams forming the non-perforated regions via stiff springs or eccentricities.

Best,
Clemens

3

Hello Clemens,

Thank you very much for the solution.

But is there any example for point 2 you made. It will be more clear once I see a simple definition explaining it.

4

Hello Greatsaiyamandbz,
sorry for my late reply. I do not have a an example on this topic which I could send you.

Split the beam into an upper and a lower part like this:

          |------------|
 ---------|            |---------
          |------------|

The vertical pieces can be either springs or eccentricities at the upper and lower parts (see manual regarding these).

Best,
Clemens

5

Hello Clemens,

Sorry for asking this and late reply. Is that a section or along beam length which you have drawn?

If its a section upper and bottom horizontal small dotted lines represent flanges for I section or you drawn section of rectangular beam? and what does small dotted horizontal lines on outside of vertical lines represent?

If its along length then it seems bad geometry.

6

Hello Greatsaiyamandbz,
it is a vertical section along the beam length.
The dotted lines left and right represent the continuous beam. The upper and lower dotted lines in the middle the parts of the beam above and below the opening. The vertical lines represent the eccentricities or springs which connect the parts.
Best,
Clemens

7

Hi Great Saiya,

I was looking in to the same problem to use a Castellated beam in karamba 3d. Did you in the end figure out the way Clemens explains or did you find another way? I am curious to your solution.

Regards,
Elmar

8

Hi Elmar88,

I also want to create this. Have you managed to figure that out perhaps?

Thanks,

Duco