arbitary cross section

Hi
I want optimize cross sections of a dome with cross over elements, but the cross section I want apply to model isn't usual (as you can see in attachment) and the thickness of all parts are variable, how I can make it possible in karamba?(my karamba version is 1.2.2)

Attachments:

dome.PNG, 628 KB
custom_profile.gh, 14 KB

Replies to This Discussion

Permalink Reply by Karamba3D on May 15, 2017 at 12:42pm

Hi Shabnam,

at the moment (version 1.2.2) Karamb can only handle beams with constant cross section. As a workaround for variable cross sections you could split the beam axes into small segments and then give each segment a different cross section.

For non standard cross sections I recommend this: calculate the cross section properties either by hand or using e.g. INCA2 (see http://www.u-pfeiffer.de/inca2/inca2-09.html). Then select a Karamba cross section that comes close to what you want to have (in your case e.g. an I-profile). Either select its geometric properties such that you get the same area, resistance moments, moments of inertia,... of use 'Modify CrosSecs'-to adjust the values.

Best,

Clemens

Permalink Reply by shabnam lotfian on May 16, 2017 at 2:12am

Hi Clemens

Thank you for the suggestion, I have one more question, if I use results of INCA2 as input for Modify cross section as you say, can karamba optimize my cross section for the dome structure or the primary cross section will apply to all parts of it?

Best regards,

Shabnam

Permalink Reply by Karamba3D on May 22, 2017 at 12:27pm

Hi Shabnam,

you can use such cross sections for optimization (see manual for details).

Best,

Clemens

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