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karamba

Karamba is an interactiv, parametric finite element program for shell and beam structures.

Current Version: 1.0.5 (February 14th 2014)

Website: http://www.karamba3d.com
Location: Vienna
Members: 506
Latest Activity: Jan 18

karamba is an interactive, parametric finite element program. It lets you analyze the response of 3-dimensional beam and shell structures under arbitrary loads.

karamba is being developed by Clemens Preisinger in cooperation with Bollinger-Grohmann-Schneider ZTGmbH Vienna.

Download the free version for non-commercial use only. In case you want to purchase a commercial license contact us via info@karamba3d.com or read the manual for details.

 

download, manual:

http://www.karamba3d.com/downloads or

http://www.food4rhino.com/project/karamba

examples (require GH 0.9.0014):

http://www.karamba3d.com/category/examples/

update report/known bugs: 
http://www.grasshopper3d.com/group/karamba/page/new-features-and-bug-fixes

Here a beam structure based on stream-lines with bending moments:


 

More details, manual, examples and download ....

 

 

Discussion Forum

Analyse weaving structural performance 2 Replies

Hi all,I am trying to feed different weaving pattern into Karamba to analyse their structural performance, but error message occurs :1. Singular Stiffness-matrix: Can not solve static system.Make…Continue

Started by wilson kwan. Last reply by wilson kwan Jan 14.

Modeling hinges in simple beam scenario 2 Replies

Hello,I am trying to model a simple beam scenario where a beam clamped on two sides has a hinge in the middle. I modeled this after the Karamba Shear Hinge definition, as two beams with a free vertex…Continue

Tags: beam, karamba, hinge

Started by Yannis Chatzikonstantinou. Last reply by Yannis Chatzikonstantinou Jan 12.

Karamba Exporter to GSA, Robot, SAP2000, Sofistik etc 14 Replies

Hi all Karamba users,I've been discussing with Clemens (and advancing on) a utility to extract the Karamba Structural Analysis model so that it could be verified or advanced in alternative commercial…Continue

Started by Jon Mirtschin. Last reply by Jon Mirtschin Jan 9.

installation problem, karamba does not appear in grasshopper 1 Reply

I've run the latest karamba_1_0_5.msi exe. file, and dragged the karamba.gha to component library, however karamba does not show up when I run grasshopper. there was no error message as such.P.S. I…Continue

Started by Shelley Xu. Last reply by karamba Dec 30, 2014.

Comment Wall

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You need to be a member of karamba to add comments!

Comment by karamba on January 8, 2015 at 11:14pm

Leonardo:

in Karamba 1.0.5 the cross section optimization algorithm only considers normal forces for buckling. The next version (Karamba 1.1.0) takes full account of the EC3 formulas including lateral torsional buckling and interaction values according to annex B.

Best,

Clemens

Comment by Leonardo on January 8, 2015 at 3:53pm

Clemens, thanks for your quick answer.

I have carefully read the appendix and the way for calculating the buckling length is clear. However I have still one questions:

seems to be that adopting Eurocode3 (eq. 6.47) only the normal forces are compared with the critical buckling load. Am I right?

Can we want take into account both, bending and axial compression, as suggested by Eurocode3 (Eq. 6.3.3)? 

Many thanks,

Leonardo

Comment by karamba on January 7, 2015 at 11:02pm

Hi Leonardo,

the Cross Section Optimization component takes into account buckling for members (see the appendix of the Karamba manual). The assumed buckling length is the distance between two nodes that connect to more than three beams or to a support or double that distance in case one end is free. The buckling lengths can be set manually via the 'ModifyBeam'-component.
If you have 'huge' bending moments in your structure then buckling will have little effect on the result. 

Sometimes so called global buckling can govern a design (think e.g. of a compressed girder of a truss structure). In such cases one has to guess the buckling length or do a buckling analysis (which will be possible in Karamba 1.1.0). 

Best,

Clemens

Comment by Leonardo on January 7, 2015 at 3:56pm

Hi Clemens,

I need your help! I have a very simple curved geometry, like an arch, composed by several beams. This is a not funicular geometry and there are huge bending moments. I do not understand:

1) if the Cross Section Optimization component takes into account buckling for members in bending and axial compression (6.3.3 - Eurocode 3).  

2) if the buckling length corresponds to each beam or to the length of the whole arch or to the distance between supports (local or global buckling.

If instead of an arch, there is a more complex structure, i.e. an arch bridge with tendons and deck, what is the buckling length of the arch adopted by the Cross Section Optimization component?

Many thanks,

Leonardo

Comment by Llordella Patricio on October 22, 2014 at 12:40pm

Dear clemens

Thanks for the help, I just created a topic discussion and add any comments that we have done so far.

Best regards

Patricio

Comment by karamba on October 21, 2014 at 12:00pm

Dear Patricio,

try to increase the number of shell elements. As mentioned in the manual they are linear elements. A mesh that is too coarse leads to a response which is stiffer than the real structure. 

Best,

Clemens

P.S.: Could you please open a new discussion on the topic? These discussions are easier to find and follow for other people who face a similar problem.

Comment by Llordella Patricio on October 15, 2014 at 3:41pm

Dear clemens

I was doing a rough estimate of the deformation, and I can not achieve the same result with Karamba.
When I make a rough estimate of the result with Karamba beams and mine are very similar, I think the problem is when I connect the shell, because there are no similar results.

I sent the GH file, and an image of the calculation

The structure is concrete
The result I get is 0.58cm

thank you

Patricio

15-10-14%20Example.gh

Comment by Llordella Patricio on October 10, 2014 at 8:43am

Perfect, that is just what I needed, thank you very much for your help, I'll keep working and any questions write again, it is very useful for students to understand the structural performance.

best regards

Patricio

Comment by karamba on October 9, 2014 at 10:46am

You could use the 'Mesh Edges'-component to retrieve the naked edges and turn them into beams - see attached file: 91014Example1_cp.gh

Best regards,

Clemens

Comment by Llordella Patricio on October 9, 2014 at 8:35am

Hello, succeeds in creating the mesh to the slab, and built the beam segment, but when I see the deformations are not expected because the beam is deformed as the slab.

Thanks for the help

PS: maybe I'm using the program for a type of structure that is not the most appropriate, as I saw in the examples of other structures. But this type of structure is that students taught

best regards

Patricio

9-10-14%20Example%201.gh

 
 
 

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