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Connecting Beam Element and Solid Element

Posted Feb 17, 2019, 12:25 a.m. EST 2 Replies

DINESH KUMAR DEVENDIRAN
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Hi,

I am trying to simulate four point bending load test on a beam. I modelled reinforcement as beam element instead of truss and concrete as solid elements. Can anyone suggest me how to define connection between beam and solid element.

2 Replies Last Post Feb 18, 2019, 5:12 a.m. EST
Dan Bence
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Posted: 5 years ago Feb 17, 2019, 6:37 p.m. EST

1) In the geometry, make the solid and beam touch 2) In the physics menu, add multipysics 3) right click on the multiphyics node and add "Solid Beam Connection" 4) make a fine mesh around the connection

I found that I had to remake the Solid Beam Connection if the topology changes. I also found it tricky to get solver convergence in some circumstances

1) In the geometry, make the solid and beam touch 2) In the physics menu, add multipysics 3) right click on the multiphyics node and add "Solid Beam Connection" 4) make a fine mesh around the connection I found that I had to remake the Solid Beam Connection if the topology changes. I also found it tricky to get solver convergence in some circumstances
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago Feb 18, 2019, 5:12 a.m. EST
Updated: 5 years ago Feb 18, 2019, 5:12 a.m. EST

Hi,

If you are using the beams as reinforcement bars inside the concrete, the best method is to do exactly as in

https://www.comsol.com/model/concrete-beam-with-reinforcement-bars-10440

Note that you must constrain the beam from rotation around its own axis somewhere, in order to avoid a singular stiffness matrix.

The Solid Beam Connection is not intended for this situation.

Regards,
Henrik

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Henrik Sönnerlind
COMSOL
Hi, If you are using the beams as reinforcement bars inside the concrete, the best method is to do exactly as in Note that you must constrain the beam from rotation around its own axis somewhere, in order to avoid a singular stiffness matrix. The **Solid Beam Connection** is not intended for this situation. Regards, Henrik

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