fire analysis to eurocodes!
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8/12/2019 Fire Analysis to Eurocodes!
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FIRE ANALYSISof Steel Structures
according to EUROCODES
Includes worked
examples
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THE FIRST COURSE IN FIRE RESISTANT DESIGN
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FIRE ANALYSIS
Fire Resistance accordin
Nominal Tempera
- Time curves
Presented by
Structural Engineer
Primož Kvaternik, M.Eng
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THE FIRST COURSE IN
FIRE RESISTANT DESIG
http://www.grsoft.eu
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in
the shape of time-temperature curve
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Nominal temperature-time curves
Nominal temperature-time curve – as it does not represent real fire, but insted the tempe
measured at previous fires.
10T 20 345 log (8t 1)
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in
the shape of time-temperature curve• Temperature of Steel Sections – Increased temperature in unprotected
protected steel sections as a result of fire exposure
The heat is transfered from the g
fire compartment to the surface
steel section or fire protection by
convection and radiation.
Convection &
Radiation
Conduction
d
Steel member
Insulation material
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in the shap
temperature curve – nominal fire curves• Temperature of Steel Sections – Increased temperature in unprotected
protected steel sections as a result of fire exposure
• Mechanical Loading – Load combinations for the Fire Limit States
, , 1 , 1,1 ,1 2 2, , fi d t j k j d k i i k i E G P A Q Q
Action
Imposed loads in buildings
1ψ 2ψ
Category A: domestic, residental areas 0,5 0,3
Category B: office areas 0,5 0,3
Category C: congregation areas 0,7 0,6
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in the shap
temperature curve – nominal fire curves• Temperature of Steel Sections – Increased temperature in unprotected
protected steel sections as a result of fire exposure
• Mechanical Loading – Load combinations for the Fire Limit States
• Mechanical Analysis – Fire resistance of structural members, critical tem
0 500 1000
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1.000
1.200
Yield st rength Young' s Modulus
,0
, , , ,
, ,
y M
fi Rd y Rd y
M fi M fi
f N k N Ak
, 3.833
139.19 ln 1 482
0.9674d cr
o
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in the shap
temperature curve – nominal fire curves• Temperature of Steel Sections – Increased temperature in unprotected
protected steel sections as a result of fire exposure
• Mechanical Loading – Load combinations for the Fire Limit States
• Mechanical Analysis – Fire resistance of structural members, critical tem
• Fire Protection of Steel Structures – Insulation materials applied as stee
encasement
Steel frame encased
with
insulationboards
Fire resistant paints
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in the shap
temperature curve – nominal fire curves• Temperature of Steel Sections – Increased temperature in unprotected
protected steel sections as a result of fire exposure
• Mechanical Loading – Load combinations for the Fire Limit States
• Mechanical Analysis – Fire resistance of structural members, critical tem
• Fire Protection of Steel Structures – Insulation materials applied as stee
encasement• Worked Examples – Calculation of critical temperature and required fire
protection for typical structural elements of real structure
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OVERVIEW
• Thermal Action – Action of the fire on the structure defined in the shap
temperature curve – nominal fire curves• Temperature of Steel Sections – Increased temperature in unprotected
protected steel sections as a result of fire exposure
• Mechanical Loading – Load combinations for the Fire Limit States
• Mechanical Analysis – Fire resistance of structural members, critical tem
• Fire Protection of Steel Structures – Insulation materials applied as stee
encasement• Worked Examples – Calculation of critical temperature and required fire
protection
• Conclusions – Importance of critical temperature on nominal fire resista