Grasshopper

algorithmic modeling for Rhino

Hi Every one, 

Recently, I try to analysis frame structure with certain "O" shape crossection beam. If I change the crossection dimension, the solver will report the the singular stiffness matrix report.

However, if I use the default dimension of crossection, the solver can generate calculation results.

So, is there anyone know what's the reason for this.

Best Regards,

Yunlong

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Hi Yunlong,

Is your grasshopper and rhino files the right ones? Tried to open them but it apparently looks like there are no properly referenced curves....See screenshot below.

Best,

Rafael

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Hi Rafael,

Thanks a lot for your help. Sorry for the problem. I just update the upload. Can you download it again to see errors. If it cannot match again. You can directly select all the curves in the Rhino model. These are the frame I want to analysis.

Thanks again for your help.

BEST REGARDS,

yUNLONG 

Hi YunLong,

Apparently, 2 of your lines are not connected to the others, and I think this is why Karamba shows an error.

You could always use the "Connected Lines" component to see if all the lines are properly connected. In these case, it shows that 2 lines are not.

Attached comes a modified version of your script that demonstrates the point and makes a sphere in the middle of those "disconnected" lines for easier identification.

A screenshot also comes so you can see what I mean :) See if by reimporting your lines and skiping these two your model works.

Furtheremore, it is always good practice to set your Rhino file units to meters. Otherwise, Karamba will yield strange results!

Hope this helps :)

Rafael

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