I have tried to input the following stress-strain relationship for SOLID 65 Concrete material, but I keep on getting error messages saying I cannot input negative slopes in the data table. I need to specify the softening behavior of concrete after the ultimate strength, is there any other way to specify it? Thank you in advance for your help.
TB,MISO,1,1,6,
TBTEMP,0
TBPT,,0.00052948,fc*0.4
TBPT,,0.000796,fc*0.6
TBPT,,0.00121,fc*0.85
TBPT,,0.0015,fc
TBPT,,0.00154,fc*0.819
TBPT,,0.00161,fc*0.276
TB,MISO,1,1,6,
TBTEMP,0
TBPT,,0.00052948,fc*0.4
TBPT,,0.000796,fc*0.6
TBPT,,0.00121,fc*0.85
TBPT,,0.0015,fc
TBPT,,0.00154,fc*0.819
TBPT,,0.00161,fc*0.276