topic Re: Arc Beam in Robot Structural Analysis Forum

Arc Beam

Anonymous — Fri, 23 Feb 2018 14:43:13 GMT

Dear All,

I would design an arc beam, but I do not know how to merge 9 bars in one. I have tried the Rafal.Gaweda addin ( merging bars) but it does not work for not aligned bars.

Could you suggest me something please?

Re: Arc Beam

Anonymous — Fri, 23 Feb 2018 15:48:47 GMT

Hello

why do you want to merge then.

Even not you can do the calculation you want as if you only have one single curved beam.

I dont think you can do it...You would have only two nodes...

Re: Arc Beam

Artur.Kosakowski — Fri, 23 Feb 2018 15:49:48 GMT

Hi @Anonymous

Please check this topic:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/rc-spiral-car-park-ramp/m-p/7380084/highlight/true#M57813

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: Arc Beam

Muhammed.OPERA — Sun, 25 Feb 2018 12:31:27 GMT

Hi @Anonymous

I may also have another thing you can do:

Model the stair or the curved thing that is supported on the beam then replace the beam by a linear hinged support.

Then you can take the integral value (longitudinal force / Unit length) of the linear support reactions in all directions and model the beam as line with those reactions as inverted loads upon the beam.

That way you can use the RC element design Module to design that beam with the loads.

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 08:55:02 GMT

@Anonymous I want to merge them because I would design it as it supposed to be: just one beam.

it is going to be hard for me design 9 small beams. Might @Artur.Kosakowski help show me how I could manage for calculating those beams! ( I'll appreciate a lot!).

@Muhammed.OPERA can you post a video how I can do that please?

If load are missed, add 200 daN/m2 in each panel!

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 09:01:53 GMT

Hi @Anonymous

To calculate required reinforcement you can try this approach but distribution of reinforcement bars or calculations of cracked deflection will not be possible.

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 10:28:06 GMT

I think is more convenient get the nodes aligned, in order to have a "normal" beam. What do you think @Artur.Kosakowski?

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 10:30:32 GMT

Hi @Anonymous

I'd say this depends on the actual bend radius of the beam and additional effects it creates (torsion).

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 11:13:46 GMT

@Artur.Kosakowski in order to make it easier what do you think if I create a beam linked in the extreme nodes, after that moving all the bottom nodes to the "new" aligned beam?

In pink the new beam

In green the nodes moved

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 11:19:40 GMT

Hi @Anonymous

Either will do. I can't see too much of the difference in the required actions.

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 13:59:22 GMT

Because in this way I can see distribution of reinforcement. In your post N. 6 it is not possible!

IMHO I would (when is possible) work with aligned bars!

@Artur.Kosakowski which method you can suggest to me?

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 14:06:13 GMT

Hi @Anonymous

It seems that I might have misunderstood your question. Do you ask me which method (required reinforcement for curved beam modeled as a chain of smaller bars vs. provided reinforcement for a straight beam) is better or which way of creating a straight beam with adjusted panels is better?

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 14:55:33 GMT

First one @Artur.Kosakowski

"which method (required reinforcement for curved beam modeled as a chain of smaller bars vs. provided reinforcement for a straight beam) is better"

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 14:59:21 GMT

Hi @Anonymous

If you want to have reinforcement bar distribution generated (and torsion is negligible) you may decide to 'replace' the curved beam with the straight one.

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 15:10:42 GMT

but what about if I put a panel below those nodes?

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 15:27:24 GMT

HI @Anonymous

I'm not sure if I understand what you mean. Is it that you want to connect panels with this straight beam?

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 15:33:29 GMT

now I'm wondering if is possible to link instead of using a beam, to use a panel or a floor, since the nodes on the bottom are not aligned

Re: Arc Beam

Artur.Kosakowski — Mon, 26 Feb 2018 15:49:33 GMT

Hi @Anonymous

You may consider moving the panel contour's corners to the positions along the defined straight bars.

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: Arc Beam

Anonymous — Mon, 26 Feb 2018 17:31:25 GMT

thank you so much @Artur.Kosakowski.

Can I ask you last thing? can you post a video about how do you achieve that please?

Re: Arc Beam

Artur.Kosakowski — Tue, 27 Feb 2018 08:58:10 GMT

Hi @Anonymous

First I created a straight beam between the end nodes of the arch beam. Then created the same number of nodes along its length as the number of nodes for the arch beam pieces and deleted the arch beam. Finally I moved the corners of the panel contours to the nodes I created along the straight beam by clicking two times on the panel corner and dragging it to a new location.

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.