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Abaqus: PROBLEMS with coupled temp-displacement analysis of reinforced concrete column

Abaqus: PROBLEMS with coupled temp-displacement analysis of reinforced concrete column

Abaqus: PROBLEMS with coupled temp-displacement analysis of reinforced concrete column

(OP)
Hi,
I am trying to make a model in Abaqus of reinforced concrete column 25/25cm with 4 longitudinal rebars with diameter 20mm and sirrups - 8mm/20cm exposure to fire, but I have several problems.
I model concrete with Concrete Damaged Plasticity material and reinforcement with truss elements with elastic and plastic material. Conductivity, Expansion and specific heat is inport in model for 20,100,200,...,1100 degrees Celsius. Elastic characteristics for concrete are 30GPa and for steel - 500MPa. I am import standart fire curve of outer surfaces of column.
I use coupled thermal-stress analysis. In first step is made initial load in 20 degrees Celsius. In second step is modeled fire exposure at outer surfaces of concrete. My difficulties are the following:
1) when i make only thermal analysis of column with reinforcement, temperature distribution in concrete is absolutely true, but in truss element the temperature is constant durring all fire exposure -20 degrees Celsius or less(node armirovka-20e+01). I don't understand why this is so.
2) The second problem is that i am introduce in Abaqus 3MPa tension in concrete in CDP material, but in results the value reaches 15MPa tension.
I do not know how to show or send you more complete information. If it is possible i can send you the hole model. I hope somebody can help me for this problems.

Best Regards

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