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5.4.1 Fire Resistance Design by Cross-Section
Fire Resistance Design by Cross-Section
This overview shows the smallest safeties and greatest ratios of the individual cross-sections in the case of fire. They result from the parameters of the reinforcement groups defined for the fire designs (see chapter 3.1.4), the provided reinforcement, and the internal forces of the relevant actions.
The lower part of the window lists all Detailed Results for the table row selected above. These design details allow for a specific evaluation of the results. They are updated when clicking into a different table row.
For information on the theoretical background of the fire protection design, see chapter 2.3.
The safeties and ratios are listed by cross-sections. In addition to the designs for Bending, the table shows the safeties for Shear Force and Torsion, provided that these designs have been activated in the Fire Resistance tab of window 1.6 Reinforcement (see Figure 3.48).
The column displays the numbers of the members that have the maximum design ratios.
The column shows the x-location on the member that is governing for the fire design. The following RFEM member locations x are used for the table output:
- Start and end node
- Division points according to member division, if specified (see RFEM Table 1.16)
- Member division according to specification for member results (Global Calculation Parameters tab of Calculation Parameters dialog box in RFEM)
- Extreme values of internal forces
Column D shows the numbers of the load cases, as well as load and result combinations that are governing for the respective designs.
Column E provides information about the minimum safety factors γ for each type of design. If the safety is less than 1, the fire resistance design is not fulfilled. The results row is highlighted in red.
The entries in this column represent the safeties' reciprocal values (column E). This way, you can quickly evaluate, which resources are available in the cross-section until the limit value 1 is reached.
The Detailed Results provides information about how the provided safeties are determined from the ratio of ultimate internal force in case of fire to effective internal force.
The final column indicates non-designable situations or notes referring to design issues. The numbers are explained in the status bar. Use the [Messages] button to see all notes of the current design case.
To the right of the table, the equivalent cross-section used for the fire resistance design is graphically displayed. The damaged zone aZ is highlighted in red (cf. Figure 2.7).
To look at the distribution of temperature in the current cross-section, click the button below the graphic. The following dialog box appears.
The table describes the Temperature Distribution in Zone Center (see chapter 2.3.2). The graphic shows the Temperature Course in Equivalent Wall according to EN 1992-1-2, Annex A.