Example 03. Temperature Dependent properties

This example demonstrates how temperature dependent properties are described in FAHTS .

The BOX profile to the left of the vertical wall is thermal insulated (PFP) and exposed to a standard Hydrocarbon fire (HCFIRE, 200 kW/m²), and is simulated 1 hour (60 minutes). The part of the BOX member to the right of the wall is unprotected and unexposed to fire.

Due to the sharp temperature gradient at the wall, the Member is given a high mesh density in the longitudinal direction, (MESHBOX).

Figure 1 FAHTS temperature field after 60 min.

Following temperature dependencies are modelled:

• Heat Capacity (see Figure 2)
• Heat Conductivity (see Figure 3)
• Insulation Resultant Conductivity, U-value, (see Figure 4)

The dependencies (general command) are defined using the command TEMPDEPY.

The different thermal properties of the steel are assigned temperature dependent by the command THERMDEP.

The Insulation properties are specified temperature dependent using the command INSULDEP.

Figure 2 Heat Capacity, Steel, temp dependency

Figure 3 Heat Conductivity, Steel, temp dependency

Figure 4 Insulation, temp dependency

Links to the input files to the actual example are:

=> Fahts Control File
=> Structural File