Robot Structural Analysis Forum
Welcome to Autodesk’s Robot Structural Analysis Forums. Share your knowledge, ask questions, and explore popular Robot Structural Analysis topics.
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Separate structure_Tubes + Beams + Sheet piling

4 REPLIES 4
SOLVED
Reply
Message 1 of 5
Anonymous
761 Views, 4 Replies

Separate structure_Tubes + Beams + Sheet piling

Hello,

 

I'm modeling a sheet piling supported on several tubes through beams.

 

I find the error "Separate structure". I used the offset option for the beams, and Autocad to determine the exact place of the panels.

 

I've thought about using Rigid links, but I don't see how to use them in this case. 

 

Tubes + Beams + Sheet Piling.jpg

 

Could you please help me?

 

 

Thanks in advance 

4 REPLIES 4
Message 2 of 5
Rafacascudo
in reply to: Anonymous

If you want to use offsets , You should keep your panels in their exact position and your beams and columms should be modelled centered on the panels planes. Only then you should apply the bar offsets for beam and columms" moving" them to their real position.

 

Right now , in the model you sent ,panels are completely separated from the rest of the structure

 

But I would use rigid linksSmiley Wink

Rafael Medeiros
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.

EESignature

Message 3 of 5
Anonymous
in reply to: Rafacascudo

Hi and thanks for your responsiveness, 

 

I've just modeled a simplified structure with only 1 panel, 2 beams and 1 tube. 

 

I designed all the elements in the same plane and applied the "offsets" for the pile and the beams. 

 

For connecting the beams to the tube, I divided the beams in two parts, to generate an intermediate node in each of them.

 

Then I applied the rigid links between these intermediate nodes and the extreme nodes of the tube. 

 

I've attached some pictures to show several results. 

 

Please have some questions:

 

  • Picture 2: 
    • Is it necessary to use the rigid links to connect the beams with the tube, or are they already connected because of the offsets? 
    • In the red circles, why is the IPE crossing the tube? Is the IPE profile supported on the pile?
  • Picture 5:
    • Why is this deformation going upward (upper beam) and downward (bottom beam)? 
  • If we don't use "offsets", how could we connect the beams to the panel? Should we divide the beams in many parts to connect them to the mesh panel through rigid links?

 

1) Displacements + Mxx (General View).jpg2) Displacements & Mxx (cross section).jpg3) Deformation.jpg4) Diagrams for bars.jpg5) Exact deformation for bars.jpg

Many thanks!

Message 4 of 5
Rafacascudo
in reply to: Anonymous

Is it necessary to use the rigid links to connect the beams with the tube, or are they already connected because of the offsets? 

 

If you use offsets it´s not even necessary to divide the beam in 2 parts.If bars cross each other in the same plane and this below is marked on structure model(which is by default) , then Robot will automatically create an "invisible" calculation node

 

intersection node.jpg

 

In the red circles, why is the IPE crossing the tube? Is the IPE profile supported on the pile?

 

In the model you sent , Offsets are active(defined) and rigid links are incomplete(no slave nodes defined) , so they are useless . So ,yes Ipe profile is supported by pile.

 

Why is this deformation going upward (upper beam) and downward (bottom beam)?

 

It seems "exact deformation for bars" is a  different from what shows mesh displacement map

. I don´t know exactly why( maybe official support?). I would go with mesh displacements. Also check node displacement table. Uz(vertical) displacement shows only 3mm for both upper and bottom nodes

 

bar x mesh displacement.jpg

 

If we don't use "offsets", how could we connect the beams to the panel? Should we divide the beams in many parts to connect them to the mesh panel through rigid links?

 

Yes , divide(create nodes along, don´t need to divide the bar in pieces) the bars according to your mesh size . Then copy these nodes to the panel plane. Use full rigid links to connect them. Mesh the panel

 

You can use Romanich excelent Spider tool to make your job easier with the many rigid links. Search the forum for it

 

 

PS- Offsets are treated as rigid links internally

 

Rafael Medeiros
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.

EESignature

Message 5 of 5
Anonymous
in reply to: Rafacascudo

That was really helpful!

 

Thanks a lot!! 😉

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report