RF-CONCRETE Members – Online Manual Version 5

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RF-CONCRETE Members – Online Manual Version 5

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3.1.4 Fire Resistance

Fire Resistance

Figure 3.15 Window 1.1 General Data, Fire Resistance tab
Existing Load Cases / Combinations

This window section lists all load cases, load and result combinations defined in RFEM.

Normally, the actions and partial safety factors relevant for the fire resistance designs are different from the ones considered for the ultimate limit state. The corresponding combinations can be created in RFEM.

Selected for Design

You can add or remove load cases, as well as load and result combinations for the fire protection design as described in chapter 3.1.1.

Figure 3.16 Options for nonlinear calculation
Nonlinear calculation

A license of the add-on module RF-CONCRETE NL is required for the nonlinear design method. The nonlinear design method is described in chapter 2.4.

To open the Settings for Nonlinear Calculation dialog box, use the [Settings] button. This dialog box consists of three tabs. They are described in chapter 4.2.


In the nonlinear calculation, it is possible to take the influence of creep and shrinkage into account. For more information, see chapter 2.2.6.

If the check box is selected, you can define the creep coefficient φ (t, t0) and shrinkage strain ε (t, ts) in window 1.3 Cross-Sections (see Figure 3.19).


The Reduction factor acc. to 2.4.2 (2) option allows for a simplified transfer of loadings from the design for normal temperature and to reduce these actions by the reduction factor ηfi.

The reduction factor ηfi is determined as per the equations according to EN 1992-1-2, 2.4.2 (3). As a simplification, the recommended value ηfi = 0.7 can be used.