Buckling modes component and RSBuck comparison

Hello,

I'm trying to check the differences between Buckling modes component and RSBuck in RStab to obtain buckling load factors for my thesis.

In many models the results are the same, but in one specific case RSBuck shows many more "modes": first mode in Karamba is like the 61. mode in RSBuck (see figure). It looks like Karamba shows some specific modes in that case. Do you have an idea why in that specific model there is a difference between these two softwares? Just in case: model is exported from Karamba to RStab without any changes, beam forces are the same in both softwares.

Best regards,

Attachments:

buck.png, 297 KB

Replies to This Discussion

Permalink Reply by Karamba3D on November 13, 2018 at 12:36pm

Hello Wojciech,

without the Karamba3D model is is hard to guess what could be the reason for the difference of results.

In the RStab model it looks like there is local buckling in some of the members. Did you use truss elements in the Karamba3D model? If yes try to switch the elements in RStab to 'Truss N only'.

Best,

Clemens

Permalink Reply by Wojciech Radaczyński on November 17, 2018 at 1:50pm