I am also trying for the correct values of properties of steel and concrete in Abaqus to modeling a post-fire behavior of reinforced beam.

Hi dear Ali Mirzaee,

Thank you for your question regarding the material properties of steel and concrete for modeling the post-fire behavior of CFST columns in Abaqus. This is a specialized topic, and several key references provide validated material models and property values specifically for post-fire conditions.

Please Refer to Key References and Resources:

2. Tao, Z., Uy, B., Han, L. H., & Wang, Z. B. (2008) "Post-fire behavior of concrete-filled steel tubular columns." Journal of Constructional Steel Research, 64(1), 37-48. This is a highly cited study specifically on CFST columns' residual strength and stiffness after exposure to elevated temperatures.

3. EN 1994-1-2: Eurocode 4 (2005) "Design of composite steel and concrete structures — Part 1-2: General rules — Structural fire design." This code provides temperature-dependent material properties for both steel and concrete, suitable for fire and post-fire simulations.

4. Lie, T. T., & Kodur, V. (1996) "Thermal and mechanical properties of steel and concrete for structural fire engineering." National Research Council of Canada, Report No. NRCC-38943. This report offers comprehensive property data such as thermal conductivity, specific heat, strength, and modulus degradation of steel and concrete.

Modeling Tips in Abaqus

• For steel, use temperature-dependent elastic modulus, yield strength, and thermal expansion.
• For concrete, implement damage plasticity models (CDP), considering the degradation of strength and stiffness post-fire.
• Utilize *Temperature Dependent Material Properties in the material definition.