topic Re: Member stability check in Robot Structural Analysis Forum

Member stability check

vitor.teixeiraHKKZG — Wed, 21 Feb 2024 12:32:23 GMT

I have created a structure with 2 floors with same load applied at each floor. After calculation I have some beams with member stability check and others not. What is the explaine for this? The member type is the same for the beams.

Re: Member stability check

Simau — Wed, 21 Feb 2024 14:09:11 GMT

Hi @vitor.teixeiraHKKZG

insufficient informations
Share your model (zipped) and specify the concerned beams

Re: Member stability check

vitor.teixeiraHKKZG — Wed, 21 Feb 2024 15:20:49 GMT

The example of beams are 24 (no estability checked) and 33 (stability checked)

Re: Member stability check

Simau — Wed, 21 Feb 2024 16:36:23 GMT

@vitor.teixeiraHKKZG

None of them are checked. The slightly difference in the ratio is du to the offset you added to member 33

Re: Member stability check

vitor.teixeiraHKKZG — Wed, 21 Feb 2024 17:26:06 GMT

That's correct but my question is why in the beam 33 you have the stability checked and on the beam 24 not checked?

Re: Member stability check

Simau — Wed, 21 Feb 2024 19:07:39 GMT

@vitor.teixeiraHKKZG

It's because member type viga is not correct.

Use instead viga_V1

Re: Member stability check

vitor.teixeiraHKKZG — Thu, 22 Feb 2024 09:00:04 GMT

Even if I make the change on the member type still don't have the buckling parameters in one of the beams (24).

Why can't have the same parameters in both beams?

Thanks!

Re: Member stability check

Simau — Thu, 22 Feb 2024 10:03:28 GMT

Update member type viga as in the picture below and save it.

Model attached

Re: Member stability check

vitor.teixeiraHKKZG — Thu, 22 Feb 2024 11:58:55 GMT

I made the changes and the result is this...

Re: Member stability check

teixeiranh — Thu, 22 Feb 2024 23:00:50 GMT

Hello,
The reason why you have that extra buckling verification is because you have compression in the beam.

Take a look at the axial forces, for the one with the verification you have compression, for the other you have tension. Tensioned elements do not buckle.

BTW: you have a beautiful surname hehehe

Re: Member stability check

vitor.teixeiraHKKZG — Fri, 23 Feb 2024 09:06:25 GMT

Hi Teixeira

Understood now!

Great name you have!

Thanks 😎

Re: Member stability check

umut.akparlar — Wed, 06 Mar 2024 13:49:27 GMT

You need to make sure assign the correct beam parameter to the beam in question then re analyse it to see the results.