Ultimate Limit State - Fire resistance

Note: Before the fire resistance data can be adjusted in service Concrete Advanced > Setup, the appropriate option must be selected in the Project > Functionality dialogue.

Setting calculation

Use equivalent temperature curve for calculation

If item is turned OFF for calculation values, which depend on temperature, will use defined temperature distribution curve

If item is turned ON for calculation values, which depend on temperature, will use equivalent temperature distribution curve, see picture below

$image\EquivalentTemperature.gif$

Type of calculation

Detailing provisions (tabulated data)

If ON, Detailing provisions will be checked (function Check fire resistance-detailing rules under Member check > Concrete Fire Resistance check will be active).

Simplified calculation method

If ON, simplified calculation method will be applied (functions Check fire resistance response, Check fire resistancecapacity, Prestress check fire resistance response and Prestress check fire resistancecapacity under Member check > Concrete Fire Resistance check will be active.

Detailing provisions

Fire (time) resistance R and critical temperature Theta_cr	automatic If option "automatic" {default} is turned on, the critical temperature in bars of reinforcement will be determined according to chapter 5.2(6) (see also chapter 8.6.1) and the fire (time) resistance is input by the user in edit box: - "Fire (time) resistance R" is active with default value is 7200s. - "Theta_cr" is inactive. from temp.curve If option "from temp.curve" is turned on, the fire (time) resistance and critical temperature will be determined from "Temperature distribution curve" (items "Fire (time) resistance R" and "Theta_cr" are inactive ) user input If option "user input " is turned on, the fire (time) resistance and critical temperature is input by the user into the appropriate edit boxes: - "Fire (time) resistance R" – default value is 7200 s - "Theta_cr" – default value is 773,15 K Note: The values are same for all reinforcement bars and prestressing strands.
Fire (time) resistance R	see above
Theta_cr	see above
Reduction factormu_phifor column	automatic If option "automatic {default}", the value mu_phi will be calculated according to chapter 5.3.2(3) value eta_fi If option "value eta_fi" is turned on, the value mu_phi will be same as value eta_fi (value eta_fi is adjusted in Concrete > Setup > ULS > Fire resistance) user input If option "user input " is turned on, the value mu_phi is inputting by user

Simplified calculation method

Use reduction factor for design level

If ON, the internal forces for the check of fire resistance with simplified method will be multiplied by factor eta_fi (value eta_fi is set in Concrete > Setup > ULS > Fire resistance)