algorithmic modeling for Rhino
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):
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This grasshopper discussion forum is no longer maintained - please post all questions on the McNeel Forum.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
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Comment
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.
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?
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
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!
Hey guys! do you know where to find the "point-load" component in the latest version of Karamba? thank you for your help
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
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
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
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
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
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