Abstract
The aim of the study was to verify experimentally the proposed new values for the default critical temperature of Class 4 cross-sections subjected to bending along the major axis on the example of trapezoidal sheets used in bare or insulated roofs under fire conditions. The results of the 33 fire resistance tests of roofs according to the standard requirements of EN 1365-2 were analyzed. During these tests the steel temperature was additionally measured beyond the standard procedure. For class 4 cross-sections, a constant standard value of 350 °C is defined, regardless of the loading conditions and the load-carrying capacity exhaustion of the cross-section, while the experimentally estimated critical temperatures of the steel sheets were between 445 °C up to 755 °C e.g. higher than the standard value. The authors have shown correlations between the degree of utilisation μ0 and the critical temperature of roof trapezoidal steel sheets and no correlations between insulation layers and the value of critical temperature of roof trapezoidal steel sheets.
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