New to Karamba

[viju81062]

Hi,

I am wanting to make a set of parallel bridges and want to analyse the beams and trusses of it. Please see below.
I have made the bridge set in just rhino. Want to develop something similar to the image using karamba. The analyse component shows an error everytime I increase he number of division points. How do I understand an arc like structure with trusses so that I get minimum displacement and maximum utilisation. Thank you!

assignment3_karamba.gh (42.5 KB)

[Joseph_Oster]

@viju81062

I kindly need help for something super easy for everyone out here but quite tricky for beginner like me.

Assuming that something is “super easy” is a bit of an insult to anyone who has put in their ten thousand hours to master a skill. Hardly a day goes by on this forum when someone doesn’t start a post with some variation of “I’m sure this is very simple but I can’t figure it out”.

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Specifically, what is your question?

[viju81062]

I hope my post makes more sense after editing it. I am trying to understand a simple bridge design that I made in rhino(image). I am wanting to use karamba to recreate and make iterations where the displacement is minimum. My attached grasshopper file can be checked if you want. Basically, how do I get iterations that show minimum displacement.

[christopher.ho]

You have forgotten to internalise the geometry. Either reupload with the geometry internalised or supply the .3dm file.

[viju81062]

Thanks for your reply. You can just put 0,0,0 for point location and it will work. Thanks!

[christopher.ho]

The error you are getting, if you hover over the red bubble in the corner is the limitation of a free version of karamba. The full version will allow more elements.

If you want to build a bridge with multiple vertical elements and compare their results:
assignment3_karambav2.gh (38.9 KB)

The component to optimize the solution is the following:

it will take a list of cross sections and replace your cross sections with the optimal one. More information is found in the karamba tutorials.
https://www.karamba3d.com/examples/
The following would be what you are looking for:
https://www.karamba3d.com/examples/simple/optimization-of-truss-diagonals/

[viju81062]

Thank you so much for your solution! I will go through the links too that you sent. Thanks again!

[viju81062]

I am trying to plugin all the listed cross sections to this component. Do I have to plug in other information like elem?

[johnharding]

I would say go and read the Karamba user manual, there is an example for using the cross section optimisation component.

A bridge like this will also need one end support released in the X axis to get anywhere close to reality, like a real bearing.

[christopher.ho]

Download and play with all the examples they give first.