topic Re: making simply supported span in Robot Structural Analysis Forum

making simply supported span

Anonymous — Mon, 25 Jan 2016 15:03:23 GMT

does robot consider the beam in this structure as simply supported beam?

I'm not getting the bending moment as it's a simply supported beam WL2/8 = 4.5KNm

Re: making simply supported span

Artur.Kosakowski — Mon, 25 Jan 2016 15:13:53 GMT

You need to define pinned connections among bars and "disregard" stiffness of the slab.

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Re: making simply supported span

Anonymous — Mon, 25 Jan 2016 15:19:46 GMT

Do I go to releases diaglog and make the beam pinned-pinned ?

Re: making simply supported span

Anonymous — Mon, 25 Jan 2016 15:26:36 GMT

how can I "disregard" stiffness of the slab.

Re: making simply supported span

Artur.Kosakowski — Mon, 25 Jan 2016 15:46:27 GMT

@AliJBH wrote:

Do I go to releases diaglog and make the beam pinned-pinned ?

As by default all connections among bar elements are assumed as rigid you need to assign pinned-pinned releases to the beams that are not intended to transfer bending moments at their connections with columns.

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Re: making simply supported span

Artur.Kosakowski — Mon, 25 Jan 2016 15:48:17 GMT

@AliJBH wrote:

how can I "disregard" stiffness of the slab.

You may define it as a cladding (surface intended for load distribution only).

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Re: making simply supported span

Anonymous — Mon, 25 Jan 2016 17:03:43 GMT

@Artur.Kosakowski wrote:
@AliJBH wrote:
how can I "disregard" stiffness of the slab.
You may define it as a cladding (surface intended for load distribution only).

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Thank you that helped

So the cladding if I'm corred is the slab for example will distribute the load, if this option is not applied then the slab will carry some load?

Re: making simply supported span

Artur.Kosakowski — Tue, 26 Jan 2016 07:33:51 GMT

In case you want to include slab as a structural part of the model you need to mesh it. To have a similar behaviour as for the cladding you need make it to work in one direction only.

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Re: making simply supported span

Anonymous — Wed, 27 Jan 2016 11:50:54 GMT

Thank you Artur

Re: making simply supported span

Anonymous — Fri, 29 Jan 2016 01:40:57 GMT

I created a new thickness as you said and released supports for beam and slab and bending moment My is excactly as excpected

but I have two question:

1) Why I'm getting the warrning (Separate structure)

2) Is it possible to view the distributed load on the beam? I can view the shear force and make a forumla 2V/L to get the distributed load but it there a direct way to do that?

Re: making simply supported span

napooil — Fri, 29 Jan 2016 02:55:40 GMT

1.I think.Robot show separate structure due to structure not connect as picture.

2.robot can.you can check box as picture.

Re: making simply supported span

Anonymous — Fri, 29 Jan 2016 13:32:43 GMT

Thank you I am now able to see the loads generated by calculation

but why the columns are not connected (I'm getting a value of 10KN for Fx), the way I used to draw them : Geomerty >> Columns >> height: 3.5 (down), and click on the location of column

Re: making simply supported span

Artur.Kosakowski — Fri, 29 Jan 2016 14:06:09 GMT

The warning is displayed as both frames are not connected neither by other bar elements nor surface elements generated during meshing of a panel.

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Re: making simply supported span

Anonymous — Fri, 29 Jan 2016 14:27:59 GMT

How can avoid that ?

Re: making simply supported span

Artur.Kosakowski — Fri, 29 Jan 2016 16:07:29 GMT

The display of the warning for such model is as designed. Just ignore it.

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