Karamba3D

Information

Karamba3D is a parametric structural engineering tool which provides accurate analysis of spatial trusses, frames and shells.

Current Version: 1.3.2 (July 9 2019)

Website: http://www.karamba3d.com
Location: Vienna
Members: 1116
Latest Activity: Oct 10

Karamba3D is an interactive, parametric finite element program. It lets you analyze the response of 3-dimensional beam and shell structures under arbitrary loads.

Karamba3D is being developed by Clemens Preisinger in cooperation with Bollinger und Grohmann ZTGmbH in Vienna.

Download a free trial now! Licenses for educational or commercial purposes can be purchased at www.karamba3d.com/buy.

downloads, manual:

https://manual.karamba3d.com/ or

www.food4rhino.com/app/karamba3d

examples (for Karamba3D 1.3.2):

www.karamba3d.com/examples/

release notes:
www.grasshopper3d.com/group/karamba3d/page/new-features-and-bug-fixes

scripting guide & examples:

https://www.karamba3d.com/download/#manual

repository with unit tests:

https://github.com/karamba3d/K3D_tests

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

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

This grasshopper discussion forum is no longer maintained - please post all questions on the McNeel Forum. Thank you

Discussion Forum

Karamba3D Joint Error 4 Replies

Hello. I’m trying to make scissor structure on grasshopper using karamba. When I want to define joints in assembly, it gives me an error. How can I define connection of the elements with revolute…Continue

Started by Atefeh Edy. Last reply by Ryyyker Oct 10.

Principal Stress Direction 6 Replies

Hello, I have a question about the principal stress direction analysis result from karamba.The first principal stress direction (PSD) is usually defined as the direction of the largest principal…Continue

Tags: direction, stress, principal

Started by X.Arthur.Ma. Last reply by Terry Austin Jul 24.

How to make a program and analysis? 7 Replies

Hello:I want to know how to make a program and analysis the structure of shell waffle welding with the steel plate.I want to create the load for the steel plate(6 mm thickness) welding with the steel…Continue

Tags: Karamba

Started by ma qingsong. Last reply by Terry Austin Mar 20.

How to define 3D Objects in Karamba 6 Replies

Hello. I have a problem in defining 3D Objects in Karamba. What I am trying to do, is that I have 3D scanned a few Irregular stones. So I have their 3D meshes in grasshopper. Then I am trying to…Continue

Tags: #irregular_object, #stones, #structural_analysis, #Karamba3D

Started by Amir Arsalan Tahouni. Last reply by George Metters Feb 28.

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Comment Wall

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Comment by Andrei Raducanu on April 18, 2015 at 3:03pm: What I don't get is why in the simply supported plate and beam examples one of the ends doesn't move horizontally when the beam/plate gets bent.

It does have the freedom to do so and in order to keep the length constant it should do so, yet it doesn't. Please answer if You can

Comment by Andrei Raducanu on April 18, 2015 at 9:44am: Can curved folding simulations be done using Karamba?
Something along these lines :

Comment by Karamba3D on April 15, 2015 at 12:03am: Elisa, you could try to place two elements in the same spot. One with, one without eccentricity and add corresponding loads to them.

Best, C.

Comment by Elisa Cheung on April 14, 2015 at 3:27pm: Clemens,

Thanks for your response. However, I'm still having trouble with the ecce-loc. I want to change ONLY the eccentricity of the prestress load , and not offset the other uniform loads. Is there a way to do that?

Comment by Karamba3D on April 13, 2015 at 11:45pm: Hi Elisa,

in Karamba 1.1.0 the post-tension load is attached to the eccentric beam element (see PreTensionLoad_EccentricBeam.gh).

The trapezoid cross section is filled (when rendered it looks hollow though). The box cross section is hollow.

Best,

Clemens

Comment by Elisa Cheung on April 13, 2015 at 6:33pm: Hey guys, I'm having two issues.

Is there any way to change the eccentricity of the post-tension load? I changed the ecce-loc input but that only changes the centroid of where the point load acts -- the post-tension load seems to be unaffected.

2. How do I get a filled trapezoid cross section? It appears to be hollow at the moment.

Thanks for your help in advance!

Comment by Nicholas Rawitscher on March 31, 2015 at 11:58am: Hey guys! do you know where to find the "point-load" component in the latest version of Karamba? thank you for your help

Comment by Karamba3D 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 Karamba3D 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