PSI - Issue 72

Ivan Aranđelović et al. / Procedia Structural Integrity 72 (2025) 354 –361

356

Nomenclature Q

specific fire load [MJ/m 2 ] fixed specific fire load [MJ/m 2 ] movable specific fire load [MJ/m 2 ] installed boiler heating duty [MW]

Q i Q m

P t w A R s H D R 0 P 0 F

total combustion time [s] boiler room area [m 2 ]

fire risk of the structure contents (Purt’s method) harm to people coefficient (Purt’s method) harm to property coefficient (Purt’s method) smoke effectiveness coefficient (Purt’s method) fire risk of the structure construction (Purt’s method) structure content fire burden coefficient (Purt’s method) structure content combustion coefficient (Purt ’s method)

C

structure construction material fire burden coefficient (Purt’s method) size and position coefficient coefficient (Purt’s method)

P k

B L S

extinguishing start delay coefficient (Purt’s method) fire sector w idth coefficient (Purt’s method)

structure’s carrier construction fire resistance coefficient (Purt’s method)

W R i

fire risk reduction coefficient (Purt’s method)

FR fire resistance of the building structure [min] S G ·F G factor of pr eventive fire protection measures (Gretener’s method - version TRVB 100:2010) F G factor of fire resistance of the building structure (Gretener’s method - versions TRVB 100:2010 and SIA81) G coefficient of geometry of fire sector (Gretener’s method - version TRVB 100:2010) b width of the fire sector [m] B G specific fire hazard factor (Gretener’s method - versions TRVB 100:2010 and SIA81) E G fire brigade intervention factor (Gretener’s method - version TRVB 100:2010 and SIA81) A G factor of fire activation (Gretener’s method - versions TRVB 100:2010 and SIA81) P G people harm factor (Gretener’s method - version TRVB 100:2010) Q G specific fire load factor (Gretener’s method - versions TRVB 100:2010 and SIA81) C G factor of combustibility (Gretener’s method - versions TRVB 100:2010 and SIA81) R G smoke hazard factor (Gretener’s method - versions TRVB 100:2010 and SIA81) K G corrosion hazard factor (Gretener’s method - versions TRVB 100:2010 and SIA81) H G building height factor (Gretener’s method - versions TRVB 100:2010) R S fire risk (Gretener’s method - version SIA81) P factor of potential fire risk (Gretener’s method - version SIA81) S G factor of special f ire safety measures (Gretener’s method – versions TRVB 100:2010 and SIA81) F S factor of fire resistance of the building structure (Gretener’s method – version SIA81) e factor of position and size of the fire sector (Gretener’s method – version SIA81) k harm to property coefficient (Gretener’s method – version SIA81) N factor of general fire safety measures 2. Specific Fire Load аnd Fire Risk Class for Boiler Rooms with Different Fuels In Euroalarm tables, only boiler rooms that use solid fuels are considered. Tables given in SIA81 and TRVB 126:1987 do not define which type of fuel is used in the boiler room, but based on the adopted coefficient of fire risk class equals to 1, it can be concluded that these are fuels of class IV fire hazard, i.e. solid fuels. Since no combustible materials are built in the construction of the fire sector in which the boiler room is accommodated, it follows that the