Kangaroo Bending Analysis

Hello,

I would like create a display of bending stresses for a gridshell being bent with kangaroo.

I have looked at the live structural feedback definition on smart geometry...

http://smartgeometry.org/index.php?option=com_community&view=gr...

But im wondering if there is a way of appliying this to my definition for the bending of a gridshell in various steps of progression until its resting position is achieved.

I can see that the components upon which the stress display is calculated are the start length of the structural members minus the rest length. If the length remains constant as the lathes are bent into shape - is there an alternative method or a way or applying this kind of feedback analysis to this process?

Thanks,

Chris I

Attachments:

GRIDSHELL TEST MODEL 01.gh, 32 KB

Replies to This Discussion

Permalink Reply by Daniel Piker on October 19, 2011 at 5:55am

Hi Chris,

You could use the script in the definition I posted here:

http://www.grasshopper3d.com/xn/detail/2985220:Comment:449639

to get the bending angles of the deformed shape

and similar to how the difference in rest length/deformed length can be used to calculate axial stress, you could get the bending stress.

There is also an intention to include bending moment and torsion outputs in Kangaroo eventually.

Permalink Reply by Chris Ingram on October 19, 2011 at 7:32am

Hi Daniel thankyou,

I have been having a look - would you use a second instance of the script component to collect the angle of the lines post simulation and subtract one from the other?

Or would i need to rebuild the input polylines for the comparison? to compare the points from input and outputs with the standard angle component. Im not sure - it seems that due to the irregular shape of the grid the order of the points is diffucult to manage if this is the case.

Thanks

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