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2.3.1 Subdivision of Cross-Section
Subdivision of Cross-Section
The cross-section is subdivided into a certain number of parallel (n ≥ 3) zones of the same thickness. For each zone, the program determines the mean temperature, the corresponding compressive strength fc,θ, and the modulus of elasticity, if necessary.
The cross-section exposed to fire is compared to an equivalent wall. The width of the equivalent wall is 2 ⋅ w. The equivalent width is subdivided symmetrically in several zones as shown in Figure 2.8.
Half of the equivalent width w depends on the fire load acting on the structural component. The following Table 2.4 gives an overview of the determination of equivalent widths conforming to the standard.
|Fire load||Half of equivalent width w|
Structural component with one side exposed to fire
Structural component width in direction of fire effects
Column or wall with both sides (facing each other) exposed to fire
0.5 ⋅ structural component width in direction of fire effects
Column with four sides exposed to fire
0.5 ⋅ smaller cross-section dimension