topic Re: How to model Beam bearing over column in Robot Structural Analysis Forum

How to model Beam bearing over column

Anonymous — Mon, 29 Oct 2018 13:48:05 GMT

I found this post:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/seated-connection-beam-on-top-of-column/td-p/7077446

Which helps with connection design. I'm wondering how to model the beam bearing on a column for building design. Whether it's a beam running over a column with a cantilever, or continuous beam with multiple posts. I tried searching all over these forums and google, but with little luck.

Thanks for any help!

Re: How to model Beam bearing over column

Artur.Kosakowski — Mon, 29 Oct 2018 14:06:44 GMT

Hi @Anonymous

Such connection type is not implemented in Robot. The post you indicated shows the possible workaround with replacing the beam with the column for correct forces being taken from the model. You need to decide if such approach is applicable for your situation.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

Re: How to model Beam bearing over column

Anonymous — Mon, 29 Oct 2018 14:31:53 GMT

Thank you Artur. Is there a work around for this? As in, would I block any degrees of freedoms, or any other techniques in order to get the correct reaction forces to the connection design?

Would compatible nodes work?

Thank you for the quick response

Re: How to model Beam bearing over column

Artur.Kosakowski — Mon, 29 Oct 2018 16:03:50 GMT

Hi @Anonymous

What is it that you are after:

- correct behavior of a connection in a model (correct load transfer among connecting elements)

- design of a connection in the steel connection module of Robot?

Re: How to model Beam bearing over column

Anonymous — Mon, 29 Oct 2018 16:23:51 GMT

I'm looking to actually model the condition (integrated with an entire roof structure), and have the reactions from the beam to post act accordingly.

Also to give appropriate results where the connection will be so when I do the connection design.

The connection design I'm ok with from your answer to the post I mentioned, but if it's possible to get correct reactions from the model for the connection design.

I am wondering if it is possible to model this in a larger scale, as in model the whole roof structure with one of the conditions and do an accurate steel design and structural design.

I have similar conditions to these two pics:

Re: How to model Beam bearing over column

Artur.Kosakowski — Mon, 29 Oct 2018 16:32:25 GMT

Hi @Anonymous

Could you attach a sketch showing the intended bending moment diagrams for the column and the beams in this connection? What I'd t find out is which you considered as having no, which partial and which full bending moment transfer to decide on use of compatible nodes and releases.

Re: How to model Beam bearing over column

Anonymous — Mon, 29 Oct 2018 16:47:16 GMT

This moment diagram is for beam supported with various posts under the span

This moment diagram would be for the condition of a simply supported beam, with a cantilever overhang at one end.

Re: How to model Beam bearing over column

Artur.Kosakowski — Mon, 29 Oct 2018 17:05:10 GMT

Hi @Anonymous

The upper diagram is too complex to understand being separated from a model but for the lower one you have two options:

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

Re: How to model Beam bearing over column

Anonymous — Mon, 29 Oct 2018 17:16:52 GMT

Artur, this is exactly what I needed for the cantilever condition. Thank you so much!

As for the other condition, it would be if there were more columns between the two columns you have, but these columns would be under the beam, so the beam would be continuous and run over these intermediate columns.

I assume though, the method you just described could be applied to these intermediate columns as well to emulate this multiple post condition?

Re: How to model Beam bearing over column

Artur.Kosakowski — Mon, 29 Oct 2018 17:25:46 GMT

Hi @Anonymous

Correct however the diagram you inserted indicates some sort of elastic support conditions in some locations.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.