Hello Team Karamba,

I am relatively new to Karamba. I was wondering if Karamba can deal with pretension problems, or support settlement problem where the initial displacement of certain amount takes place that causes forces developed in the truss or frame members. 

Kind Regards.

Hello Earth,

use the 'Prescribed Displacement'-component and 'InitialStrain' from the 'Loads'-component to define support settlements and pretension in elements respectively. For details see the manual. It can be downloaded from http://www.food4rhino.com/ or http://www.karamba3d.com/downloads/. Please open a new discussion in case of further questions.

Regards,

Clemens

Hello:

I want to know how to make a program and analysis the structure of shell waffle covered with the steel plate.

I want to create the load for the steel plate(6 mm thickness) to check the displacement of the waffle structure.

I uploaded the schematic diagram and part of the program. Any suggestion? 

Please help me.

Thank you very much

Ma

ma20170129.gh

Hello Qinsong,

Do you have the steel plate mesh? If you do so you can use the Mesh Load component, setting the vector force to global in negative Z direction (the amplitude of the vector will be the mesh load (kN/m²).

In the component you can set the points of the mesh witch the load will be accounted, try to insert there only the upper nodes of your waffle structure.

Márcio

Hello Márcio,

Hello Márcio,

Thank you for your answer.

Normally I have done as you said. But it's no relate to the thickness of the steel plate. I want to change the thickness of the steel plate to check the displacement of the waffle structure. I uploaded the part of the program. Could you help me finish the program? Thank you very much.

ma20170129.gh

Hello Qisong,

See attached the changes I made. To parametrize the thickness of the plate you just need to multiply its material density with the thickness (going from kN/m³ to kN/m², or just from volume to surface load).

ma20170129.gh

Dear Márcio:

You are very friendly. Thank you so much.

I'm sorry about that I did not describe the problem right. My English is bad.

I means the waffle structure and 6mm steel plate are Welded together. They become the overall structure, and I give the strong power to the overall structure to check the displacement. As it is shown in the image, the green plate is the steel plate, the yellow is the waffle structure. The overall structure is the waffle structure and steel plate are Welded together. How to analysis? Could you help me finish the program again?

Thank you very much.

Hello everyone! 

I'm doing my final project to graduate in engineering. What I'm trying to project is a footbridge that sail along the coast supported with puncheons. I am new in Karamba. When I considerate loads I had problems how to considerate wave, wind loads and the deck weight. how can I simulated all these loads?

bordo%20linea%20strada.3dm

FootbridgeKaramba.gh

Dear all,

could you please add a new discussion in case of questions? Postings on the comment wall are hard to follow and not easy to find by others.

Best,

Clemens

Hello Silvia,

For deck weight you should model a mesh of it and add a Mesh Load component including the nodes you want to consider (See Karamba manual for details, also in the previous comments I helped ma qingsong with a similar problem).

For wind and wave analysis you should first check for the structure vibration modes (For wind the first frequency should be >1.5Hz, i'm not sure what frequency band you need for waves). Grater stiffness and less mass helps to increase the frequencies. Once you achieved those results you can make a statical analysis considering these loads, again i'm not sure what to do for wave loads, but for wind I normally use the method used in this video: https://www.youtube.com/watch?v=-t3yE1xxMUo (it's a very simplified method, but do it's job).

I can take look on your GH definition tomorrow.

I going to have a look! thank you Marcio Sartorelli! I have added a new discussion for my problem as Clemens suggested! I will write you under my new discussion later

Hi!

I just downloaded Karamba trial about an hour ago, and I cant get going with my model. I have an interlocking structure (eggcrated, see picture: there is an error in that the long beams should rest on the arcs, not the other way around as it is now) that is to be glued together. How would I set up an analysis like this? 

Hi Martin,

you could use short connector beams with corresponding joint definitions at their ends.

Please open a new discussion if you want to discuss the matter further. The comment wall is not so well suited for that.

Best,

Clemens

Hi all, is it possible to run 100 karamba analysis automatically using different values of variables? and record the results? Thank you.

Hi Earth, if you wish to run multiple analyses automatically, you can look at either optimisation processes such as Galapagos or Octopus or you can simply use a Data Recorder to record your results.

Best,

Matthew

Hello, 

I am encountering a problem with the optimize cross section.

I just download example file from http://www.karamba3d.com/examples/hard/large-deformation-of-a-shell/, but there is an error when I open it, like"151 cross sections need to be bigger than their biggest family member", so what should i do to correct it?  .....I am new...

Thank you

Hello Wanggian,

in order to make the warning disappear you could change the upper limit of the cross section height from 65cm to some larger value.

Best,

C.

Hey there

I am quite new to Karamba and would really need your help.
I am trying to analyze the structure for a new priject and I am struggeing with the supports (always the error: could not find node at ...)
Could someone have just a short look on that?

Thank you

Niklas

Tragwerk.3dm

Tragwerk.gh

Hi Niklas,

you have to make sure to split the lines into segments at their intersections otherwise Karamba will out put errors. Also make sure to flatten the input for the Elements in the Model-component. Please see the attachment.

MatthewTragwerk_MT.gh

Hello,
I have trying to analyze a Truss Structure with Karamba3d.

My problem is whenever I recompute my definition, Karamba Analysis result changes significantly.

Karamba%20Problem.gh

Dear Mahdiyar,

your system is kinematic in three modes. This causes the problems. Please add an new discussion (see above) in case of further questions.

Best,

Clemens

Hello, 

I am a complete nube here and want to know how to analyze a space frame using karamba unfortunately I don't even know where to begin and the videos are not much help to me. If someone could lead me in the right direction that would be great. Like I said I am a beginner and have never worked with the program before so any help I can get would be great. 

Hi Joe,

you can start by first creating your geometry in Grasshopper or manually drawing it in Rhino. Afterwards you can follow the Parametric Truss of Buckling Bridge example on our website to guide you how you can set up your line geometry as beam elements to bring it in Karamba.

best,

Matthew

Hello,

I am trying to create stress lines on a modified enneper surface,

however the stress lines are not being equally distributed, the support are taken at 3 points where the surface is meeting the ground...i have already given the points in the grasshopper file...

i hope i can get equal distribution of stress lines...

thank you, ishan

surface%20cleaning%2021-4-2018.3dm

stress%20lines_enneper%20surface.gh

Hi Ishan,

at first glance, it seems that you used random points to draw the shell lines. Did you try inputting points that are exactly equally distributed in all three directions on the surface to see if the line outputs are equal?

best,
Matt

Hello,

I'm new to Grasshopper and Karamba. I have created a simple scissor stucture in Grasshopper and wanted to do a structural analysis using Karamba. I am working on my PhD thesis. The model which is in attachment shows double joints at the end of scissor elements, because there are two of coincident points /the end of one beam is the start of another one/.

I do not know the way to fix this.

Could anyone help me with this, please?

Amela scissorstructuretestwithjoints2.gh

hello matt,

i have re made the surface with equal point distribution..but still the stress line distribution is not that equal...can you have a look once.

thank you

enneper%20surface%20part%202.3dm

stress%20lines_enneper%20surface.gh

Hello Karamba, I need to optimize sections of steel truss with the norm AISC 360-10 standard, Karamba optimiza with the Eurocode-1993, was reviewing the hacker guide and I need to see the operation of the "optimize cross section" component, but I can not find the file karamba.dll, Where i can find it? , I have the version of Karamba 1.3.0 for Rhinoceros 6. Thanks!

Hi Ishan,

your geometry is still not symmetrical in three directions, also the input points for the shell lines need to be also symmetrical.

Matthew

hello matt,

i have changed the surface and tried to run the analysis on it to get the stress lines. The output is very much pleasing however i wanted to verify whether the methodology is correct or not ?The support conditions are where the surface meets the ground and the load is gravitational

thank you.

enneper%20surface%20stress%20lines%20trial.3dm

stress%20lines_enneper%20surface_trial.gh

hello!

I have aB question about utilization. As shown in this image, utilization of element sometimes comes to be 2001.19 ( to be exact, utilization/100), in spite of not so big stress. Could somebody tell me the reason for this?

Dear Takuma Kawakami,

could you please open a new discussion on the issue below? The comment wall is not a good place for technical questions, since discussions here are hard to follow and hard to find by others.

Best,

Clemens

hello, Karamba, i am learning karamba, and I need to remove assemblies, I added the karamba.dll and karamba.gha files, but I think that only the karamba.gha file was necessary, how can I delete those assemblies? . I also have another problem because of the aforementioned and that is not open the example 'TenComElim', the script turns red and does not work, does not recognize the following code: Karamba.Models.Model model = (Karamba.Models.Model) inModel;
Add the karamba.gha file that is also in the example but it does not help much, that is why I want to eliminate the assemblies and replace the necessary ones.

I have Karamba 1.3 and Rhinoceros 6

Hi Jhoseph,

why do you need to remove the Assemblies? Can you simply uninstall Karamba and reinstall it so that all the files are replaced?

Is it correct to place the 2 assamblies: karamba.gha and karamba.dll ?, I added the 2, I read in the manual that karamba.gha should be added, maybe that is why the example of the component "TenComElim" does not work. I just reinstalled Karamba and those 2 assamblies keep appearing. Why does the "TenComElim" component not work? It does not recognize the code Karamba.Models.Model model = (Karamba.Models.Model) inModel; does not recognize the classes !!!

Hello Karamba,

I have a question about how I could create a printable model from cross setion optimized structure? I have optimized beams but those are tubes not solid meshes. 

I have an idea how I can get some closed meshes. If I can get somehow the cross section radius data from the algorithm I could generate meshes with cocoon component. Which is the easyest way to get a printable model?

Thank you! 

Hi Ollé,

you can use the DiassembleModel and then the DisassembleBeam to extract the cross section sizes of the beams and you can create the meshes in Grasshopper for printing.

Matthew

Thank you very much Matt! This solution is working. You saved my life! ;)

Dear Karamba Team, 

I have a question concerning a Problem in my studies with Karamba.

I have a "voxel system" (Bounding boxes for a later on Geometry)(01_Image). I took the upper and lower edge curves from the the boxes to apply in between some optimized diagonals(optimization of the position of the points on the lines) for that I am using the Idea of Element Felting and the mapper component(+ the different stich possibilities). For one Box(02_Image) it works totally fine but by applying it on all my voxels it does not work how I imagine. So the aim for me is that every box has its own diagonals. Concerning the set up I just set up a fast Karamba model the supports and the loads will be than later on in a more detailed way defined. 

Could someone help me applying the system on all voxels ?

Thank you!

All the Best,

Leonie 

I uploaded two scripts the one for one voxel where the system works and the "multiple Voxels" scripts where it doesnt work.

The Images should show the one voxel and the Idea and the other image the basic voxel massing.

180531_stitchedsystem_multipleVoxels_LE.gh

180531_stitchedsystem_onetestobject.gh

Dear Leonie,

the problem in your definition with multiple voxels is, that you provide one mapping only. This means that all upper and lower voxel boundaries are handled like one upper or lower girder of a truss. Due to this there are voxels with no connections at all (see attached definition 180531_stitchedsystem_multipleVoxels_LE_CP.gh) which cause rigid body modes. In order to solve the problem reduce its complexity and start with two voxels only.

Please open a new discussion on the subject since it is easier to follow and find for others as compared to a comment on the comment wall.

Best,

Clemens

Hello Karamba team!!!

How could I perform the following load combinations in karamba?

Thank you! 

Dear Jhoseph,

In these situations I usually generate loadcases for each type of Load, as Karamba analysis is linear is not a problem to magnify the design loads after the analysis.

To test diverse load combinations I generate scripts that take the caractheristic values from the analysis and returns all the design combinations. My undergraduation thesis is the creations of plugins that apply Eurocode 5 for verification of timber structures and i'm using this a lot, please fell free to contact me for further explanation.

Cheers.

Hello,

i seem to have a problem with my beam view not working and i just cant seem to understand why. Your help will be much appreciated. Also is there a way of how i can reduce the number of the yellow lines representing the mesh load so that they don't seem so dense for visual appeal? Basically, i need to reduce them and space them and possibly increase the arrow size showing the direction of the mesh load.

Thank you

Hi Kudrah,

i see that you are working with millimeters in your file. One thing is that Karamba interprets all units in meters. Therefore if you input geometry that is in your model 4000mm, it will interpret this as 4000m. This can be one issue causing the load densities. You can also increase the Length Segments slider in the Render Settings tab of the Model View to reduce the number of visible loads in the Model View.

best, Matthew

Hey there, 
I am trying to get familiar with the cross section optimization of bridges, but when I want to open the example from the Karamba website I got an error: 

Component Octopus {f0913905-0d71-4c22-b63d-60d6e6cf4cf6} failed to deserialize itself: Die Datei oder Assembly "HelixToolkit.Wpf, Version=2013.1.10.1, Culture=neutral, PublicKeyToken=52aa3500039caf0d" oder eine Abhängigkeit davon wurde nicht gefunden. Das System kann die angegebene Datei nicht finden.

What am I doing wrong?
Did I open it with the wrong version of Octupus?

Thanks a lot, 

Niklas

03_Optimization_ShellBridge.gh

Hi Niklas,

as this relates to an Octopus issue, you should post this query on the Octopus forums. Unfortunately we are unable to help with this specific issue.

Best,

Matthew

Hi Vincent, it should not make a difference. Simply send us the machine-id file as is and if you encounter any issues, just email us.

best,

Matthew

Hi, Karamba,

I purchased a student license a few hours ago, I'm aware that it might take 2 days for you to handle the process, but I have an assignment due next Monday, can you help me accelerate my request please? I'm really in a hurry.

The machine ID and payment credential were send to info@karamba3d.com.

Thank you so much!

Dear Jhoseph=),

could you please add a new discussion on the topic below? The comment wall is not a good medium for technical discussions.

Best,

Clemens