Shell calculus

Hello again,

I am writting about shell analysis (I posted my structural model and the associated grasshopper file).

Usually shells are not alone, they are stiffened by perpendicular metal sheets and that is my case.

When I analyse the displacements, it appears that my stiffeners are not sealed on the shel but (it seems) just pinned at some points and so they bend a lot.

How can solve this issue?

Thank you all!

Attachments:

Plaque raidie.3dm, 1.4 MB
plaque raidie.gh, 29 KB

Replies to This Discussion

Permalink Reply by Karamba3D on May 17, 2016 at 12:40am

Hello Brice,

in Karamba elements are connected only of they have coincident nodes. In case you want to connect several shell pathces use the 'MeshBrep'-component. It automatically assures that all input Breps are rigidly connected and lets you define points on the Breps which shall be nodes of the resulting mesh. With the latter it is possible to attach beam elements to shells.

Best,

Clemens

Permalink Reply by BRICE CANTENEUR on May 20, 2016 at 1:53am

Hello Clemens,

I totally agree with your explanation and this is what I did I my GH that I added to the discussion. However it seems the stiffeners on my shell bend in the wrong way and I can't understand why this behaviour.

I did the same calculus in SAP2000 and Robot and I find the same mapping of the utilization and displacement but the stiffeners don't react like in Karamba. And it is kibnd of a problem to write a calculus note with screenshots of stiffeners that react kind of like chewing-gum!

Thanks for your help!

Permalink Reply by Karamba3D on May 23, 2016 at 12:04am

Hello Brice,

do you have a small example where the problem you describe above occurs?

Best, C

Permalink Reply by BRICE CANTENEUR on May 23, 2016 at 2:01am

Hi Clemens,

I attached a rhino file and the related gh file in my first post. In those files you can see that the stiffeners (the red ones) don't bend in the "natural" way and they seem not to be attached to the shell.

Thanks for your help!

Permalink Reply by Karamba3D on May 24, 2016 at 11:56am

Hi Brice,

in Karamba shells are connected only if they have coincident vertices. For some of the stiffeners in the above example this is not the case. Try to use the 'MeshBreps'-component of Karamba. It automatically connects the input meshes.

Best,

Clemens

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