FIGURE 37.11 Input data for calculations in Table 37.7: (a) dimensions (mm), (b) temperature distribution, and (c) cross-section layers. Steel Columns

It is commonly assumed that a steel column is surrounded by fire on all sides so that the steel temperature is uniform. Because the stress-strain relationships of steel at elevated temperatures are nonlinear and cannot be assumed to be elastic-perfectly plastic, calculations of the column resistance in fire are slightly different from those at ambient temperature. In Eurocode 3, the column axial compressive resistance is calculated from

where Pu,fi is the column squash load at elevated temperature T and is calculated from

Wfi is the column strength reduction factor to account for the column slenderness effect and is given by

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