Stucture

Replies to This Discussion

Permalink Reply by Karamba3D on November 2, 2016 at 1:45pm

Hi Jason,

you can change the slenderness of a beam by either changing its length or its moment of inertia. For the latter you use the 'Cross Sections'-component which lets one define arbitrary cross sections (for details see the manual).

The nodal displacements can be output via the 'Nodal Displacements'-component. Then determine the absolute values of the nodal translations (output-plug 'Trans') and cosort them with the list of nodes of the structure. The list of nodes comes out from e.g. the 'Disassemble Model'-component.

In order to disable the wireframe preview go to 'Display' in the Grasshopper menu and select 'Preview Mesh Edges'.

Best,

Clemens

Permalink Reply by Jason Chen on November 2, 2016 at 9:20pm

thank you for your reply timely!

now,I still have some confusing problems ,please help me solve these problems.

 first ,Is karamba  able to consider load combinations  when it analyse the Model？Because the output result of the 'NodeDisp 'component correspond to the LoadCase , it didn't take account of  all load combinations  to calulate  the max displacements.

second, I use the 'OptiCroSec' and 'galapagos'to optimize the space truss，but i find the optimization result didn't take account of the bar slenderness.

Permalink Reply by Karamba3D on November 3, 2016 at 2:39pm

The 'Disp'-ouput of the Analysis component is the maximum displacement of all load cases.

In Karamba 1.2.2 the  results of the 'Nodal Displacements'-component come out as a data tree which contains the data of all load cases (see the help text which pops up when the mouse pointer hovers over the corresponding output plug).

For members under compression the 'OptiCroSec'-component should take account of the slenderness. Did you have a look at the examples which come with Karamba in '..Rhinoceros 5.0 (64-bit)\Plug-ins\Examples\TestExamples\Optimize_Cross_Section?

Best,

Clemens