Material properties of concrete with reference to fire resistance
For Simplified calculation and for Advanced calculation with nonlinear combinations "during fire (Ps1)" and "during fire (Ps2)" new material properties of concrete must be defined. Other properties will be calculated using the simplified calculation method "Zone method" described in EN 1992 - 1 - 2: 2002 (reduced strength, reduced Young’s module, new strain-stress diagram).
Stress-strain diagram (fire resistance)
This group is active only if functionality Fire resistance (of concrete) is turned on.
Strain diagram for nonlinear analysis (fire resistance)
This group is active only if functionality Fire resistance (of concrete) and Physical non-linearity for reinforced concrete are turned on in the Project data dialogue.
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Type of diagram |
By code with automatic temperature (default) The temperature will be loaded automatically as the temperature in the centroid of a layer of a cross-section. Property Picture of Stress-strain diagram is active, but the graphical interpretation of the stress/strain diagram is without numerical values. By code with fixed temperature Item Temperature can be used to input the value of temperature and stress/strain diagram for this temperature will be same as for all layers of the cross-section. Property Picture of Stress-strain diagram" is active and the graphical interpretation of the stress/strain diagram contains numerical values.
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Picture of stress strain diagram |
Shows the diagram in graphical form.
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Type of aggregate
The material property Type of aggregate is also important for the fire resistance calculation and should be therefore adjusted with proper carefulness.
Note: Siliceous aggregates are: (i) quartzite aggregates, (ii) sandstone aggregates and (iii) basalt aggregates. Calcareous aggregates are only limestone aggregates