Basic principles of the fire resistance analysis
The methods of verification of the fire resistance are described in the standard EN 1993-1-2. The main result is the time of fire resistance of the structure, that is compared with the required time of the fire resistance. The required fire resistance is given in corresponding regulations and differs according to the type of the structure.
The analysis is based on the specified loading for the fire design situation. The resistance of the structure during fire situation is based on the rules for common design, however, the characteristics are affected by the increased temperature. During the analysis, the critical temperature is calculated for entered load. After that, the fire resistance period is calculated. This period is calculated as a time, when the critical temperature in steel will be reached. It depends on the selected temperature curve and specified fire detail.