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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.

Figure 2.8 Subdivision of a wall with both sides exposed to fire into zones according to [5], Figure B.4

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.

Table 2.4 Determination of equivalent widths
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

[5] Quast, Ulrich. Zum nichtlinearen Berechnen im Stahlbeton- und Spannbetonbau. Beton und Stahlbetonbau, Heft 9 und Heft 10, 1994.

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