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Robot Structural Analysis

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Valued Contributor
Jorgew09
Posts: 52
Registered: ‎01-11-2012
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unrealistic beams ?

403 Views, 10 Replies
03-29-2012 03:52 AM

Hi,

 

When I designing my steel beams which are supporting a hollow slab, I get unrealisticly small beams with small ratio. It seems like Robot do't understand that the beams are suppose to carry the slab or something.
Can I send the file by FTP, so that you can se if there is anything wrong? 

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Rafal.Gaweda
Posts: 4,984
Registered: ‎04-26-2010

Re: unrealistic beams ?

03-29-2012 03:52 AM in reply to: Jorgew09

Yes, please



Rafal Gaweda
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Valued Contributor
Jorgew09
Posts: 52
Registered: ‎01-11-2012

Re: unrealistic beams ?

03-29-2012 04:10 AM in reply to: Rafal.Gaweda

It seems my accunt is deleted, I get a error message from my ftp-client, which indiacate that mye username/password is rejected

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Valued Contributor
Jorgew09
Posts: 52
Registered: ‎01-11-2012

Re: unrealistic beams ?

03-29-2012 04:42 AM in reply to: Jorgew09

file sent :smileyhappy:

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Artur.Kosakowski
Posts: 4,592
Registered: ‎12-17-2010

Re: unrealistic beams ?

03-29-2012 05:11 AM in reply to: Jorgew09

I would consider a small change in the definition of the HD thickness :smileyhappy:

 

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.



Artur Kosakowski
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Valued Contributor
Jorgew09
Posts: 52
Registered: ‎01-11-2012

Re: unrealistic beams ?

04-11-2012 05:59 AM in reply to: Artur.Kosakowski

 I also have a model where the slabs are timber, and i have the same issue with the beams. But there isn't a "disregard stiffness of transvere bending" option for homogeneous timber panels. Any idea what may be wrong?

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Artur.Kosakowski
Posts: 4,592
Registered: ‎12-17-2010

Re: unrealistic beams ?

04-11-2012 06:10 AM in reply to: Jorgew09

Could you send the model and the picture that illustrates what you get and what you would like to see please?



Artur Kosakowski
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Valued Contributor
Jorgew09
Posts: 52
Registered: ‎01-11-2012

Re: unrealistic beams ?

04-12-2012 02:09 AM in reply to: Artur.Kosakowski

F. ex,in the attached picture, the indicated beam have a very low ratio..

I'm sending the file by ftp 

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Artur.Kosakowski
Posts: 4,592
Registered: ‎12-17-2010

Re: unrealistic beams ?

04-12-2012 02:50 AM in reply to: Jorgew09

Most likely the reason is that the beams are defined at the level of the floor (in reality they are below it so that thay 'attract more bending') . If you offset the beam under the panel you will get tension force rather than bending and this is not the solution in case you want to run the design of these beams. My proposal would be to define the panel as a cladding (no mesh) and use the triangular and trapezoidal load distribution method instead. In case you want to design the slab create another model with offseted beams and meshed panels.

 

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.

 

 



Artur Kosakowski
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Valued Contributor
Jorgew09
Posts: 52
Registered: ‎01-11-2012

Re: unrealistic beams ?

04-13-2012 01:51 AM in reply to: Jorgew09

When I try to add thickness to the claddings, it's automatically generated mesh when i calculate the modell. Must I add the wight from the floors manually?

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