ABSTRACT
Here, the advantages of the software DIANA (deWitte & Wijtze 2005) in modeling discrete reinforcement and passing user-supplied subroutines for the definition of the constitutional material behavior in the thermomechanical analysis should be used without the loss of flexibility for the thermal analysis. To avoid the problems explained in the full paper, a multi-mesh approach with a microscale mesh for the thermal analysis and a macroscale mesh for the thermomechanical analysis was chosen.This approach is possible when meeting several requirements and basic estimates. Due to the uncertain nature lying in the description of fire scenarios, design fire curves in fire protection engineering are usually applied over the complete height or length of a building component. This assumption leads to a simplification of the thermal analysis where only the cross-section of a building component needs to be analyzed depending on the edges exposed to fire, e.g. a column centered in the compartment exposed from four sides or a beam located at the ceiling which is usually assumed to be exposed from one or three sides. The resulting temperature field is then transferred to the FE-model defined for the thermomechanical calculation and adapted over the whole height or length (see figure 1).
