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Dear Mr. John Doyle
 
Thank you for your advice.
 
The simulation setup simulates a typical compression test, so I don’t think there should be any problem, and I have confirmed that the model using CPT215 will converge.
(Reference for CPT215 model:
)
 
We also tried stabilization damping with various patterns and restart points, but again, we did not get a tendency for the stresses to soften.
 
It has already been discussed that the softening behavior of concrete is critical in simulating reinforced concrete.
Any further advice on this fundamental issue would be appreciated.