Femap mesh beam and tetra 1

[zeljko2]

Hi,

I have problem with Femap.
Cann I mesh beam and tetra element in same solid.
Beam and tetra must have same node.

 

[rb1957]

i think you have to explain your problem better ...

a beam is a 1D element between two nodes,
a tet is a 3D element with four nodes.

Quando Omni Flunkus Moritati

 

[zeljko2]

This is problem of reinforced concrete.
I have tetra element (concrete) and beam (bar) elements reinforcement(steel).
Beam is 1D element, and tetra is 3D element, but they must have same node.

Some nodes must be same for beam and tetra.

 

[rb1957]

ok, you have a solid mesh (for 3D elements). if you planned things, you'd have a line of nodes that you could make into a beam.

two things,
1) i'd suggest modelling the column as a single beam with the properties of the composite concrete and rebar(?)
2) at a minimum i think the "beam" should be modelled as a rod (if it is rebar). if it is something substantial (like an I-beam) then modelling as a beam Might be ok ... remember the solid elements only have translational freedoms so you'll need to think about constraining the bending freedoms in the beam (maybe only the torsion, Mz).
3) consider posting in the structural forum, they deal with this type of structure more often.

Quando Omni Flunkus Moritati

 

[AlRobertson]

Femap's mesher has been able to acount for internal and branching faces and curves within a solid since version 10. A consistent mesh can be created exactly for this kind of example for beam elements within a solid tetra mesh.

 

[zeljko2]

Thanks for answer.
I know that Femap 10 cann work with beam and tetra in same solid, but I do not know which command must use, I need example(video) too.

 

[AlRobertson]

Starting from a geometry model which includes solds in which there are curves, the workflow is as follows:

- If the curves touch the bounding surfaces of the solid, make those points mesh points
(Mesh / Mesh Control / Mesh Points on Surface...)
- Mesh the curves to create beam elements
- Mesh the outside surfaces of the solid to create triangle elements (nodes should conicide with the mesh points)
- Ensure that there are no duplicate nodes, which are likely to be at the mesh points
- Mesh the interior of the solid (Mesh / Geometry / Solid from Elements...), selecting both triangle and beam element types

The resulting tet mesh should conform to the interior beam elements.

 

[zeljko2]

I have still problem with tetra-beam mesh, all is in file.

 

[zeljko2]

I above link (files.zip)is model which still have problem with same node for tetra and beam elements.
In file is modeel in Femap 8.1, and stap by step procedure in Word.

This is cube with length 10, and one line. All line was modelled with 2 element.
Model must have same node for tetra and beam elements.

 

[AlRobertson]

It seems that you are using Femap 8.1. We established earlier in this thread that you need to use Femap version 10 or later.

 

[zeljko2]

Thanks AlRobertson, with Femap 10 it works, this is great possibility for Femap 10, and me too.