I am using ABAQUS/Explicit to model a push-out test comprising solid slabs and cold-formed steel (CFS) joist. The shear connector is a CFS stiffened angle. Load application is by displacement boundary condition (BC). The slip obtained from the experiment is 2.5 mm but my modeling result is about 0.3 mm. Both experimental and FE plots are similar. Below is a summary of the modelling parameters.
Concrete: CDP & C3D8R
Cold-formed Steel &shear connector: S4R
Interaction: surface-to-surface/frictionless contact for steel to slab, connector to slab (embedded constraint) & rebar to slab (embedded constraint)
BC: The slab is restricted at the base from moving in the direction of the load application and laterally.
Loading: a rigid body constraint (tie) is used i.e reference point to CFS)
Suggestions are appreciated.
Dear Silas,
Interesting subject!
Firstly, is there a reason that you are using the Explicit solver? wouldn't Abaqus/Standard be more appropriate?
If the experimental and numerical load-slip graphs are identical and only the slip is shifted, it might be that the strength of your connector or material is correctly modeled but their stiffnesses are not. Have you checked your material properties and interaction properties?
Lastly, you mentioned that you assigned a rigid body to the CFS part for loading purposes. this means that all of the nodes of that part will have the same motion and therefore there will be no deformation in your CFS part. Is that correct? and if it is, wouldn't this be affecting your slip?
Thank you so much Hooman Eslami
I'm using the Explicit solver to overcome convergence problems. I have checked material properties and interactions. As for loading, I tried using MPC constraints. The results were similar.
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