*CONCRETE TENSION STIFFENING

Optional parameters

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of the postcracking behavior, in addition to temperature. If this parameter is omitted, the postcracking stress depends only on the cracking strain, the strain rate, and, possibly, on temperature. See Material Data Definition for more information.

TYPE

Set TYPE=STRAIN (default) to specify the postcracking behavior by entering the postfailure stress/cracking-strain relationship.

Set TYPE=DISPLACEMENT to define the postcracking behavior by entering the postfailure stress/cracking-displacement relationship.

Set TYPE=GFI to define the postcracking behavior by entering the failure stress, $σ_{t 0}$ , and the fracture energy, $G_{f}$ .

Data lines if the TYPE=STRAIN parameter is included (default)

First line

Remaining direct stress after cracking, $σ_{t}$ . (Units of ${FL}^{- 2}$ .)
Direct cracking strain, ${\tilde{ε}}_{t}^{c k}$ .
Direct cracking strain rate, ${\dot{\tilde{ε}}}_{t}^{c k}$ . (Units of $T^{- 1}$ .)
Temperature.
First field variable.
Second field variable.
Etc., up to four field variables.

The first point at each value of temperature must have a cracking strain of 0.0 and gives the failure stress value, $σ_{t 0}$ .

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)

Fifth field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of the postcracking behavior on temperature and other predefined field variables.

Data lines if the TYPE=DISPLACEMENT parameter is included

First line

Remaining direct stress after cracking, $σ_{t}$ . (Units of ${FL}^{- 2}$ .)
Direct cracking displacement, $u_{t}^{c k}$ . (Units of L.)
Direct cracking displacement rate, ${\dot{u}}_{t}^{c k}$ . (Units of ${LT}^{- 1}$ .)
Temperature.
First field variable.
Second field variable.
Etc., up to four field variables.

The first point at each value of temperature must have a cracking displacement of 0.0 and gives the failure stress value.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)

Fifth field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of the postcracking behavior on temperature and other predefined field variables.

Data lines if the TYPE=GFI parameter is included

First line

Failure stress, $σ_{t 0}$ . (Units of ${FL}^{- 2}$ .)
Fracture energy, $G_{f}$ . (Units of ${FL}^{- 1}$ .)
Direct cracking displacement rate, ${\dot{u}}_{t}^{c k}$ . (Units of ${LT}^{- 1}$ .)
Temperature.
First field variable.
Second field variable.
Etc., up to four field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)

Fifth field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of the postcracking behavior on temperature and other predefined field variables.