FIRE RESISTANCE OF GALVANISED MEMBERS -...
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FIRE RESISTANCE OF GALVANISED MEMBERS Jiří Jirků Czech Technical University In Prague Training School Malta Department of Steel and Timber Structures
Transcript of FIRE RESISTANCE OF GALVANISED MEMBERS -...
katedra ocelových a dřevěných konstrukcí
FIRE RESISTANCE OF GALVANISED MEMBERS
Jiří Jirků
Czech Technical UniversityIn Prague
Training School Malta
Department of Steel and Timber Structures
katedra ocelových a dřevěných konstrukcí
Contents of the presentation
• Motivation
• Heat transfer in fire technology
• Fire tests
• Further Research
Department of Steel and Timber Structures
Training School Malta
katedra ocelových a dřevěných konstrukcí
Motivation
• Surfacing of the Steel Structures is not accountedin the calculation of Fire Resistance
• Advantages of Galvanazing compared to Intumescent Coating
• Price availability
• Reduction of labour consumption
• Acceleration of construction
• Aesthetic properties
• New possibility of using zinc coated members
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
Department of Steel and Timber Structures
Training School Malta
katedra ocelových a dřevěných konstrukcí
Heat Transfer in Fire Technology Conduction – molecular process of heat transfer
Fourier´s Law
Heat flux to boundary depends on surrounding and surface temperature:
Radiation ‐ heat flux of electromagnetic waves
Convection – fluid passing by the surface
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Fire Test 2010• Pavus a.s., Veselí nad Lužnicí, 20. 10. 2010
• Horizontal Furnace with System of Oil‐burners
• Standard Fire Curve
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Specimens:• Hollow Cross Sections – TR 114,3 x 4 – 1000 mm
• Opened Cross Sections – IPE 200 – 1000 mm
Galvanized Surface:
• Average Thickness 119 μm
• Temperature of Galvanizing 460°C
• 1 Specimen – Admixure Al in Galvanizing Bath
Department of Steel and Timber Structures
Training School Malta
Fire Test 2010Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcíDepartment of Steel and Timber Structures
Training School Malta
Fire Test 2010Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
• Specimens after Fire Test
Department of Steel and Timber Structures
Training School Malta
Fire Test 2010Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Surfacing after fire test
Department of Steel and Timber Structures
Training School Malta
Fire Test 2010Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Measured Values
0
200
400
600
800
1000
1200
0 5 10 15 20 25 30 35
Průměrná teplota plynu u prof ilů [°C] IPE1 IPE2 IPE3 IPE4
θ [°C]
t [min]
Department of Steel and Timber Structures
Training School Malta
Fire Test 2010Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Results ‐ Analytical Approach
Heat Transfer – „black“ specimen:
hnet = hnet,c + hnet,r
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Results ‐ Analytical Approach
Heat Transfer – galvanised specimen:
hnet = hnet,c + hnet,r
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Results ‐ Analytical Approach
• Surface Emissivity• Aluminum εm = 0,3
• Galvanized Steel εm = 0,32
• Stainless Steel εm = 0,4
• Steel without surfacing εm = 0,7
Department of Steel and Timber Structures
Training School Malta
0
200
400
600
800
1000
1200
0 5 10 15 20 25 30 35
Průměrná teplota plynu u prof ilů [°C] IPE1 IPE2 IPE3 IPE4
θ [°C]
t [min]
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Results ‐ Analytical Approach
εm = 0,32
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Fire Test 2011 – Real structure
Department of Steel and Timber Structures
Training School Malta
Pavus a.s., Veselí nad Lužnicí, 15. 09. 2011
Full scale test on real structure, dimensions 10,4 x 13,4 m
qfi,d = 525 MJ/m2, opening 5 x 2 m
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Fire Test 2011 – Real structure
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcíDepartment of Steel and Timber Structures
Training School Malta
Fire Test 2011 – Real structureMotivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Fire Test 2011 – Furnace
Department of Steel and Timber Structures
Training School Malta
Pavus a.s., Veselí nad Lužnicí, 11. 10. 2011
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcíDepartment of Steel and Timber Structures
Training School Malta
Fire Test 2011 – FurnaceMotivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
katedra ocelových a dřevěných konstrukcí
Aging of zinc coated members Influence of thickness of zinc coating surfacing Composition of galvanizing bath Numerical model
Specify emissivity of galvanised surface Calibrated numerical model Shedule of temperatures for zinc coated steel members in
standard temperature curve
Further research
Department of Steel and Timber Structures
Training School Malta
Motivation
Heat transfer in fire technology
Fire test 2010
Fire test 2011 –Real structure
Fire test 2011 ‐Furnace
Further research
Goal of the work
katedra ocelových a dřevěných konstrukcí
Thank you for attentionURL: www.ocel‐drevo.fsv.cvut.cz
Jiří Jirků
České vysoké učení technickév Praze
Department of Steel and Timber Structures
Training School Malta
