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concrete damaged plasticity

concrete damaged plasticity

concrete damaged plasticity

(OP)
please help me,I am confused.
I modeled two shear wall with a steel beam coupled them under cyclic loading.

but i have a problem.i am going to verify my model with a test program. i must control beam "force - displacment" curve (that is a hystersis curve)With that obtained from testing,but my curve   (obtained abaqus) haven't any degradation at consecutive cycles .what reasons are for this problem? why i have'nt any stiffness degradation in my model.
i define damage parameter :dt=1 - ft/ft0 and dc=1 - fc/fc0.

what i should devote to stiffness recovery ( compression and tension recovery).i sent my curve and  testing curve at following picture.
 http://files.engineering.com/getfile.aspx?folder=73917273-3329-42f3-b003-68a97126db5f&file=control_curve.JPG

RE: concrete damaged plasticity

(OP)
please help me

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