Concrete frame analysis

[martino81]

Hello everyone,

I have built a 3D reinforced concrete frame in ABAQUS. The model is built in SI(m) units. I have also implemented a Damaged Concrete Plasticity model in my material definition and I have specified a compression stress of 51000000 N/m² and a tensile stress of 2333333.33 N/m². The model seems to have run fine. I have some beams aligned with the X axis which mainly bend in the plane XZ. If I look at the S11 stress (parallel to the X axis) the positive stresses (i.e. tensile stresses) at the beam midspan are greater than the tensile stress specified in the material definition. I am a little bit puzzled and I think there is something I am not interpreting correctly here as the model can only reach plasticity in tension at the tensile stress specified in the Damage Concrete Plasticity model or it can miss convergence if the loading is too onerous and internal equilibrium cannot be reached. I attach a picture below showing the beam I am talking about with a probe tensile stress value shown too. You can see how the tensile stress is greater than the 2.33333333 N/mm²

Does anyone have any suggestion on what I should double check in my model?

Thank you.

Martino

 

[Mustaine3]

I'm not familiar with that material model, but I think by definition S11 is not a tensile stress. It's a stress in a speific direction. A tensile stress can be found in the principal stresses.