T-Beam CDP

[mrcastel]

Hi,

I'm trying to model a concrete T-Beam in Abaqus CAE. I'm using the Concrete Damage Plasticity with these parameters:

Dilatation Angle: 36
Eccentricity: 0.1
fb0/fc0: 1.16
K:0.666
Viscosity Parameter: 0

Compressive Behavior:
24 0
25.05 4E-005
32.59 7.6E-005
39.6 0.000128
45.93 0.000199
51.42 0.000293
55.84 0.000418
58.85 0.000582
60 0.0008
58.56 0.001091
53.42 0.001486
42.67 0.002041
22.87 0.002852

suboptions
0 0
0 4E-005
0 7.6E-005
0 0.000128
0 0.000199
0 0.000293
0 0.000418
0 0.000582
0 0.0008
0.024 0.001091
0.11 0.001486
0.289 0.002041
0.619 0.002852

Tensile Behavior

4.8 0
4.03 0.0064
3.27 0.0127
2.5 0.0191
1.73 0.0254
0.96 0.0318
0.72 0.0635
0.48 0.0953
0.24 0.1271
0.01 0.1588

Suboptions
0 0
0.16 0.006
0.32 0.013
0.48 0.019
0.64 0.025
0.8 0.032
0.85 0.064
0.9 0.095
0.95 0.127
0.99 0.159

For the 4-points bending test, the T-Beam is over reinforced underneath the neutral vibre, because I want the beam to fail in pressure. I'm using a static, General step and C3D20R elements.
The model now only calculates till 60 Mpa. This is the maximum load of the stress/strain diagram. Then Abaqus need too many attempts to make the next increment. Does anyone can solve this problem or help me?

Thanks!