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This grasshopper discussion forum is no longer maintained - please post all questions on the McNeel Forum.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
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 William Chec Sep 11.
Hi,I'm modelling steel warehouses for my thesis but I'm running into problems. When specifying that the beams elements should act as trusses, it shows very large deflections at certain locations. The…Continue
Started by Niels Hofstee. Last reply by Charlie Flint Jun 20.
Hey,I am going to analyze a kinetic structure that transforms by sliding movement like telescopic piston. However I failed to define the cirrect joint. In a simple explanation, imagin two beams (A,B)…Continue
Started by mahnaz bahremandi Feb 5.
please post here in case of karamba problems !Continue
Started by Karamba3D. Last reply by Abraham Shkolnik Dec 22, 2022.
Comment
Hello, I have a problem and couldn't find anything useful.
The problem is this:
1. There are 157 rigid body modes in the system. This means some parts can move freely without causing deformation.
Try to use the 'Eigen Modes'-component and activate the display of local coordinate axes: The first eigen-mode will be the rigid body motion.
If this does not help, check whether you have a pinned support directly attached to a hinge. A hinge introduces an extra node which may cause the problem.
When analyzing a flat shell structure one has to lock the rotation perpendicular to the plate in at least one node.
I saw that you recommended using "Connected Parts (Karamba3D)" or "Eigen Modes (Karamba3D), but it seems like I have only one branch on my list.
I hope20.12.3dmkaramba.gh you can help me with it:)
This plugin is developed by GeometryGym so please get in touch with them. Also, this forum is no longer maintained, so please post questions in the Rhino Forums.
Hey,
I'm trying to export karamba model to SAP but am aving some difficulties and have this error.
I've installed the ggkaramba from package manager. tried with all of them(karamba, ggSAP, ggkaramba) in older version still doesn't work. would much appreciate the help.
I can't see the ggSAP in karamba see below.
But it's visible in gg plugin,
Dear all, please use the McNeel Forum (see https://discourse.mcneel.com/c/grasshopper/karamba3d) to post your questions and not the comment wall.
-- Clemens
Hello, I am creating a parametric model of shell truss for evolutionary optimization. When applying Mesh Brep component on my model, the resulting mesh gets weirdly distorted and broken around the edges. Do you know what might be causing this issue? Here is my GH definition:5.Issue.gh
another questions about the initial strain load, from the cases provide, for example,the beam with initial strain load do not have shear force and bending monent. in my understand , pure axis force only is much more safe then shear force, bending moment, and axis force together(hope my understand is right)
not sure my understanding is right: this initial load is the results of axis-force we want it inside and a load affect.
my question is, 1. in reality projects where does this load come from? it is the results of load we want. then how to add this on?
2. if we can use initial strain load to replace other loads, then how to transfer other loads with initial load. for example the beam under gravity become an arch, but we want a pure axis force arch, no shear force, then how to transfer gravity G=10 equals initial strain load?
3 is there any case of projects use initial strain load help me understand?
hi, clements, thank you very much for your answer.
I learn this case about mesh load and have 3 questions
1. there are meshs and beam, but the mesh do not have material , only have load, what is that?
2. the mesh is not attached to beam, how to understand it?
in my understand the case is , for examble, mesh is floor , have dead load or live load, then under floor is attached beam, this floor and beam should have intersect part, then the load will transfer to the beam. but here, they are seperate.
3, the mesh load is z-direction, but it turns a x-direction affect on beam, why
pls help, i know you help alot already
keep safe from virus hope vienna is ok
jiaxing lu
Hi, Jiaxing,
the eigenmodes and eigenvalues result from the solution of the eigenvalue problem (see e.g. here) of the stiffnessmatrix S. The eigenmodes show in ascending order those deformation modes which the structure can take on most easily. The eigenvalues are the ratio between the internal forces and the corresponding eigenmode displacements.
The eigenvalues and eigenshapes as calculated in Karamba3D have nothing to do with stability or vibrations. For the buckling modes one has to solve the general eigenvalue problem which involves the stiffness matrix and the geometric stiffness matrix. For the vibtration modes it's the general eigenvalue problem involving the resultant stiffness and mass matrix.
-- Clemens
hi, clements, i read karamba manual again, during that, the eigenmode and eigenvalues still troubles me to understand, it seems to test vabration and get eigenvalues by eigenmode.
what is the funcion of eigenmode, and what does the eigenvalue mean?
stability? do the eigenvalues has standard to show whether it is safe or not?
sorry, it seems a basic structure knowledges,
right sorry for that, and thanks
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