Concrete tension damage

Hi everyone

Does anyone know about tension stiffening of concrete. Actually I have a problem with getting these values. i have an example of it and I wanna show you to clarify. So, the given information is as follows:

E= 31027 mpa

V= 0.15

Density= 2663 kg/m3

Compressive initial stress= 13 mpa

Compressive ultimate stress= 24.1 mpa

Tensile failure stress= 2.9 mpa

Therefore, for mentioned above "tensile behavior" in terms of dis. is as following: ( concrete damage plasticity )

Yield stress.               Displacement

2900000                      0

1943930                     6.6185E-005

1303050                     0.00012286

873463                       0.000173427

585500                       0.00022019

392472                       0.000264718

263082                       0.000308088

176349                       0.00035105

118210                       0.000394138

79238.8                      0.000437744

53115.4                       0.000482165

Hence, for tension stiffening ( concrete tension damage ) following values are taken:

 Damage parameters.              Displacement

0.                                                    0

0.381217.                                 6.61E-005

0.617107.                                 0.00012286

0.76307.                                   0.000173427

0.853393.                                 0.00022019

0.909282.                                 0.000264718

0.943865.                                 0.000308088

0.965265.                                 0.00035105

0.978506.                                 0.000394138

0.9867.                                     0.000437744

0.99177.                                   0.000482165

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So my properties are as following:

E= 23000 mpa

V= 0.2

Density= 2386 kg/m3

Compressive initial stress= 13 mpa

Compressive ultimate stress= 20 mpa

Tensile failure stress= 2.5 mpa

Please help me to find the values.

KHALED GHAEDI