[Gmsh] Representation of moment of beam

[corra85 at tiscali.it]

Christophe Geuzaine
wrote:


Corrado
Chisari wrote:
  

  Christophe Geuzaine wrote:
    

    

    Corrado Chisari wrote:
      

      There's a possibility to plot the real
moment of a beam, without linear interpolation? when a distributed load
acts on the beam, the representation should be parabolic, not linear. I
thought I could use the plugin "evaluate", but it works for nodes,
while I need to change the interpolation, not node values.
        

      
use 2nd order interpolation (3-node line elements)?
      

      

      

      Thank you for your wonderful program,
especially for geometry module which is much much better than
everything I saw in commercial FEM programs!
        

Corrado Chisari
        

        

Michele Mocciola wrote:
        

        / I would like to represent moment of a
beam like a
          

        
/>/ curve line referred to the beam ( points on the beam
        

/>/ are zero values and distance between the curve and the
        

/>/ beam is the moment value ).
        

/>/ How can I get it?
        

/
        

In recent nightly builds you can use the "Normal raise" option (in
Options->View->Offset)
        

        

        

        

        / Thanks.
          

        
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I can't use 3-node line elements in my solver (Code Aster)...by all
means, it shouldn't be necessary to use 2nd order beam elements,
because 1st elements are exact in static linear analysis. Any other
suggestions?
    

  
  

Maybe I don't understand your question. If you have a single line
element with vector nodal values (1 vector associated with each
extremity), we cannot represent anything else that the linear
interpolation over the element...
  

  

  

  

  

  Thank you,
    

Corrado Chisari
    

    

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Ok, I'll try to explain my goal better. We know that when a distributed
load acts the correct moment of a beam is parabolic; I'd like to see a
parabola when I use "Normal raise" option to represent the moment.

Is it possible with gmsh?

You suggested to use 3-node line elements: I try to write a simple file
.msh but probably I'm wrong in something...

$MeshFormat

2 0 8

$EndMeshFormat

$Nodes

3

1 0 0 0

2 5 0 0

3 2.5 0 0

$EndNodes

$Elements

1

1 8 3 0 1 0 1 2 3

$EndElements

$NodeData

1

"Prova"

1

0.0

3

0

1

3

1 0.0

2 0.0

3 12.0

$EndNodeData



Sorry, for I still annoy you, but it's quite important for me!

Corrado Chisari 
   _______________________________________________________________
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