Reinforced Concrete Columns

[21513367]

Hi All, 

I am trying to carry out an FEA on reinforced concrete columns on Autodesk Inventor Nastran 2025. My analysis consists of reinforced concrete columns. I have modelled each of my columns and have set my loads and constraints. However, when I run the analysis, it does not run as expected. The problem is that the steel and concrete are being treated as two separate components and don't work together (the steel rebars should strengthen the concrete).

Would anyone be able to help with this problem? It would be much appreciated.

Thanks and Regards,

Dani

[John_Holtz]

Hi Dani,

1. Did you define bonded contact between the steel rebars and the concrete? See section 6 in the PDF document attached to my forum post Suggested Reading - Tips and Tricks on the Inventor Nastran forum.
2. Did you make holes in the concrete for the rebars? (They cannot occupy the same volume! Plus, you need the surface of the hole in the concrete in order to select the faces that are in contact with the outside of the rebars.)
3. Or if you did not create the rebars using solids, what element type are you using and how did you connect it to the concrete?

John

[21513367 · Accepted solution]

I made holes in the concrete for the rebars and constrained them to the concrete! But I’m not sure how to connect them so that they work together. I will have a look at the PDF and see if that helps,

Thank you!,

Dani

[21513367]

Just a quick update, if anyone else has this same issue. Defining contact between the steel rebars and concrete solved my problem!

Thanks 

[mdmanik_mia]

How did you solve this problem? Could you please share your ideas here?
I am also planning to model reinforced beam where I want to add rebar there. But not sure how I can do that. Do I need to create hole inside and then create solid (circular rebar) there and then attach bonded contact there?