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concreteMembers.htm
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FAQ
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Test Data - Concrete
Members
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Annex A (informative) of EN1992-1-2 (2003) provides
a series of calculated temperature profiles for slabs or walls,
beams and columns. The available design charts are summarised as
follows:
Member
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Cross-section dimensions [mm]
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Standard fire resistance
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Slabs or walls expose to one side
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Thickness = 200
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R30 - R240
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Beams
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Height × width = 300 × 160
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R30 - R90 & 500°C isotherms
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Height × width = 600 × 300
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R60 - R120
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Height × width = 800 × 500
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R60 - R240
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Square columns
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Height × width = 300 × 300
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R30 - R120 & 500°C isotherms
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Circular columns
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Diameter = 300
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R30 - R120 & 500°C isotherms
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The design charts are based on the following assumptions:
- The specific heat of concrete corresponds to 1.5% of moisture
content.
- The lower limit of thermal conductivity is used.
- The emissivity of concrete surface is 0.7.
- The convection factor is 25.
- The spalling of concrete does not occur during fire exposure.
Figure 1 shows the temperature profiles for slabs
with thickness = 200 mm for R30 to R240. Figure 2 shows the temperature
profiles for beams with width × height = (160 × 230
mm) and (300 × 600 mm) for R30 to R120.
Figure 1 Temperature profiles for slabs with height =
200 mm (EN1992-1-2:2003)
Figure 2 Temperature profiles for beams with differenct
width to height ratios
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