Hello,
I am trying to model a four point bending for RCC beam using abaqus CDP model. I used displacement control type. The issue is whenever I change the value of the applied displacement, it results in different load-deflection behavior.
Knowing that:
1) I applied the displacement and supports on a line
2) I used coupling constrain to gather all reaction to one point on the support line
Attached are different load deflection curves corresponding to different displacement values applied. "green one represent experimental results"
Thanks in advance.
It looks ok to me. All three curves shows equal initial stiffness. Expectedly, numerical stiffness is higher than the experiment. Also check your rebar stress strain output to verify the ultimate capacity of beam which should be close the experimental result.
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