how to define the damage of concrete damage plasiticity

[yywxy2003]

i do some research on concrete damaged plasticity,but i have some
questions that how to define damage,such as dt and dc.
in the abaqus verification manual 2.2.22, they define the compression
behavior and the tension behavior including the damage as following:

Compression behavior:

Stress Inelastic strain Damage Inelastic strain
24.019E+6 0.0000 0.0000 0.0000
29.208E+6 0.0004 0.1299 0.0004
31.709E+6 0.0008 0.2429 0.0008
32.358E+6 0.0012 0.3412 0.0012
31.768E+6 0.0016 0.4267 0.0016
30.379E+6 0.0020 0.5012 0.0020
28.507E+6 0.0024 0.5660 0.0024
21.907E+6 0.0036 0.7140 0.0036
14.897E+6 0.0050 0.8243 0.0050
2.953E+6 0.0100 0.9691 0.0100


Tension recovery factor = 0.0.

Tension behavior:

Stress Cracking strain Damage Cracking strain
1.780E+6 0.0000 0.0000 0.0000
1.457E+6 0.0001 0.3000 0.0001
1.113E+6 0.0003 0.5500 0.0003
0.960E+6 0.0004 0.7000 0.0004
0.800E+6 0.0005 0.8000 0.0005
0.536E+6 0.0008 0.9000 0.0008
0.359E+6 0.0010 0.9300 0.0010
0.161E+6 0.0020 0.9500 0.0020
0.073E+6 0.0030 0.9700 0.0030
0.040E+6 0.0050 0.9900 0.0050


Compression recovery factor = 1.0.

I want to know how to calculate the damage in the compression and
tension behavior.thanks a lot.







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