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Bracing Members

12 REPLIES 12
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Message 1 of 13
graham.johnstone
4669 Views, 12 Replies

Bracing Members

Hi,

 

I was interested to know if there were any member types that could be used within Robot to define lateral bracing members in such a way as to prevent them from attracting any gravity loading and only allow them to attract wind loading? I am designing a steel structre which is stabilised laterally by tension only cross bracing. 

 

Thank you in advance for your help.

 

Graham 

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12 REPLIES 12
Message 2 of 13

Try to define them as tension only elements (and exclude them from self-weight load list).

 

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
Message 3 of 13

Artur,

 

Thank you for your reply. I have assigned the properties of a tension only member and as expected the utilisations have fallen to acceptable levels.

 

Another point with the model is that it reports a "Stability error (Type 3)". I have tried to attach a zipped version of the model without results but the file size is to large (2 MB). Can I further reduce the file size or send in another way?

 

Thanks,

 

Graham

Message 4 of 13
Message 5 of 13

Thank you Artur. The model is located at the following link:

 

http://www.filemail.com/dl.aspx?id=ZVPBEISHJOBAOKL

Message 6 of 13

1. Delete releases from truss bars

2. Correct roof using the detailed correction to planes.

 

https://www.filemail.com/dl.aspx?id=FVGPFTIEBDRPYCO

 

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
Message 7 of 13

Hi Artur,

 

I followed your instructions and now have the model analysing with no errors reported. I also chose to represent the bracing members as "truss bars" rather than tension only members.

 

Thank you for your help,

 

Graham 

Message 8 of 13

I also chose to represent the bracing members as "truss bars" rather than tension only members.
If they are supposed to transfer both compression and tension then this is correct. If you don't want them to work under compression then you should use tension only.

 

 



Artur Kosakowski
Message 9 of 13
Tuctas
in reply to: graham.johnstone

  Take a look at the topic: http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Collecting-phases/td-p/3505898

maybe it will also help you about your question.

Message 10 of 13
Ievgen
in reply to: Artur.Kosakowski

Can you please advise what's better in regard of robot's interpretation of braces: to define braces as truss members (tension\compression) or set end releases to the bracing member? 

Message 11 of 13
Rafal.Gaweda
in reply to: Ievgen

Up to you.
But in case of having convergence problems with tension \ compression only bars it is recommended to replace them by unidirectional relases:
http://help.autodesk.com/view/RSAPRO/2016/ENU/?guid=GUID-A65C66FB-20DA-4B7C-BFE2-3A7B0CF54F7E



Rafal Gaweda
Message 12 of 13
npron082
in reply to: Artur.Kosakowski

How would one go about excluding members from the self-weight load list?

 

Thanks

Message 13 of 13
gutitocal
in reply to: npron082

Hi @npron082

Hope this help 

 

 

 

Load_table.jpg

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