Hello
I'm trying to model a reinforced concrete frame in Abaqus using CDPM for concrete material. I have entered damage parameters as well. Longitudunal rebars were modelled as 3D solid elements. Their interaction with concrete was defined as embedment. The force does not decrease after some point. What can be the reasons for that? I will upload the material properties and the force - displacement curve. According to experimental results, force decreases after 120 mm. The results are compatible up to this point.
Thank you for your answers.
-Mehmet Ali
Please check the failure mode of the experimental program and the numerical model. Also please check all the units of the data in the numerical model to ensure all the data are in the same unit system.
Shaojun Zhu
The units of the all data are correct. I couldn't understant what you mean in the first sentence.
For example, member A fails in the experimental program.
So please kindly check the stress/strain of member A, and the material properties, and meshing conditions related to member A. Maybe that will provide you some clue on how to modify the model.
Shaojun Zhu Concrete at the bottom section of the columns crushes, and a rebar ruptures at the same section. In the numerical model, stress values for concrete element at this section increases more than the defined stress. Element size is very small at this section.
Which element have you chosen for the concrete?
Maybe C3D8R would be better.
Shaojun Zhu I have chosen C3D8R element for both the concrete and the longitudinal rebars. For stirrups (3D wire), i have chosen T3D2 element.
Is your model using a displacement controlled test or a load-controlled test ? In the latter case, you will not get a descending branch in the load-displacement curve.
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