concrete damaged plasticity

Hi All,

I am trying to model a simply supported reinforced concrete beam with longitudinal reinforcement. I am using 8-node solid elements for the concrete, and 2-node truss elements for the longitudinal reinforcement bars. I have embedded the reinforcement bars in the concrete using an Embedded Region constraint. I am then applying a displacement at the midspan (deflection control). I am using the Concrete Damaged Plasticity model for the concrete. My model begins to run but will not converge. Some of the error messages that I get are:

I'm trying to develop yield surface of a material for a particular value of hydrostatic stress(since CDP model uses drucker-prager hypothesis).. In user manual, it is given that, for Kc value of 1, i should get a circle, and for Kc value of 0.667, i should get a shape of inverted triangle in deviatoric plane.. But I have tested for 3 values of Kc, 0.667, 0.9 and 1, for all, i'm getting the same inverted triangle in the deviatoric plane. 

*Concrete Damaged Plasticity 
22., 0.33, 1.16, 0.667, 0. 

Hi, we're trying to model with ABAQUS a reinforced concrete beam under a rolling load. We want to investigate the compressive low cycle fatigue of reinforced concrete elements under a variable bending moment. We are using a Static Step (total step time: 18000 sec) and a concentrated force applied on the middle cross section with the following load history*:

Hi all,

I'm trying to solve a frame structure in ABAQUS. I'm using 3D beam elements (B31) so that shear and bending stresses may appear. This is ok for an elastic analysis, but I also want to perform a failure analysis of this frame. Therefore, I'm trying to use the "concrete damaged plasticity" material in ABAQUS.  But I've read in the manual I can't use B31 elements with this material.

 Does anyone know how to combine the "concrete damaged plasticity" material in a 3D beam analysis? Any other suggestions?