Loads or displacement issue

Hi, I am a beginner to use Karamba3D.

In these couple days, I watched and practiced the whole tutorial videos on the official web pages. So I tried to modify gh file from Shell and Beams tutorial to analyze my structural design. I face a problem is that whenever I want to give the structure "Gravity Force " or "MeshLoad Const Force" then the displacement will go crazy.

Literally, have no idea.

I tried to put extremely low value for force and see some collapse pattern, but still can't fix it.

Besides, for the "MeshLoad Const Force", can I put different levels of mesh surface to a single "MeshLoad Const Force"? Seems not. But I wonder how should I give MeshLoad for each floor?

//Shell and Beams tutorial

https://www.karamba3d.com/tutorials/tutorials_basics/simple-shell-a...

Attachments:

Model_Analysis.3dm, 234 KB
Model.gh, 57 KB
Capture.PNG, 342 KB

Replies to This Discussion

Permalink Reply by Matthew Tam on December 14, 2018 at 12:43am

Hi Chen,

it seems that your columns are not split at the intersection to the beams. Therefore when you do the analysis, Karamba interprets the beams as not connected to the columns. Split all the columns at the intersections before you convert them into Beam Elements and this should solve your high displacement issues.

best,

Matthew

Permalink Reply by Chen Chih Yuan on December 14, 2018 at 3:00am

Hi, thanks for your reply.

But I still can't fix it.

I make sure all the lines are all separated before I set them in grasshopper.

best,

Chen

Attachments:

Model.gh, 62 KB
Model_Analysis.3dm, 104 KB

Permalink Reply by Chen Chih Yuan on December 14, 2018 at 10:38am

Hi, I want to update my question.

I found that right after I assign "Mesh to Shell", the displacement went unpredictable huge. I think it might because the shape of my surface is not a rectangle. I tried on the tutorial gh code, it can totally handle one more floors problem, but I can not figure it out how to deal with the non-rectangle mesh surface. I think it might cause some error when using "Mesh Surface" in my problem which may lead Karamba hard to define the support on the Mesh shell.

It's seems fine when I do not apply any "Mesh to Shell" in my case.

Attachments:

Permalink Reply by Karamba3D on December 19, 2018 at 1:04pm

Hi Chen Chih Yuan,

you have to connect the shell to the edge beams (see attached files): subdivide the edge beams, then use their end-points as inclusion points for the shell mesh via Karamba3D's 'MeshBreps'-component.

Best,

Clemens

Beam_Match_cp.gh

Model_Analysis.3dm

Permalink Reply by Chen Chih Yuan on December 22, 2018 at 3:32pm

Thank you so much!!!!

It works!

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