What boundary constraint should I assign to reinforcement embedded in 3D solid element in Ansys or any other FEM software? I have to model reinforced concrete beam. I have used a 3D solid element for cocnrete beama nd a line element for reinforcement. If its a simply supported beam so what boundary condition should I assign on reinforcement?
Dear Sumaira,
The key is that the concrete and the reinforcement are perfectly bonded such that there is no relative motion between them.
Regards,
Jose
If you attach the reinforcement line element to the nodes of the concrete solid elements (so they would have coincident nodes), you wouldn't need to assign any boundary conditions to the reinforcement - they would be perfectly bonded. You just assign the "normal" BCs on the beam itself.
Just to mention in case you don't know: If you use ANSYS, you could assign the reinforcement directly in the concrete Solid65 elements (as a "smeared" reinforcement) without using the additional line elements.
I hope this helps.
Regards,
Vladimir
U dont need to give any boundary conditions specially for reinforcements. The only thing to take care is the bond between the steel and concrete. If ur using a line element u can connect the line elements between the nodes of the corresponding solid elements. This will not ensure the complete bond but it can be used as an approximation.
I am using TNO Diana. It means if beam is modeled as solid element and reinforcement is embedded as a line element, then I must ensure that the reinforcement nodes must corresponds to solid element nodes. Thankyou Sumaira and all others. great question :)
In Abaqus i make embedded but i didn`t ensure that the reinforcement nodes must corresponds to solid element nodes. Is this right ??
I am not familiar with Abaqus, but I think that in general, you need to "couple" the reinforcement with the concrete in order to achieve realistic beahavior of your model. This coupling can be achieved, besides using coinciedent nodes, in other ways, depending on the purpose of the analysis. (for example, if you need to examine the bond behavior, you could use special elements to model the bond).
How can I model stirrup in 3D beam? Do I need to ensure that the reinforcement nodes must corresponds to solid element nodes?
You can also use REINF264 element: 3-D Discrete Reinforcing. In this case, reinforcement in bonded in the based element to provide additional axial stiffness. So you do not have to use additional line element
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