Distribution of temperature in steel and composite beams and joints under natural fire
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Distribution of temperature in steel and composite beams and joints under natural fire F. Hanus (B.E.S.T. design office) & J.-M. Franssen (Univ. of Liege) More info on http://hdl.handle.net/2268/ 66090 Motivation: analysis of connections in cooling phase => calculation of temperatures in steel beam and in joints. xisting « lumped capacitance » method: heating t a a a m sh d net d transferre Q V c t A k h Q , , unprotected steel sections (heating and cooling) protected steel sections (heating) lower half of a steel beam with a slab on the upper for the upper part of the steel beam with a slab
description
Distribution of temperature in steel and composite beams and joints under natural fire F. Hanus (B.E.S.T. design office) & J.-M. Franssen (Univ. of Liege). Motivation: analysis of connections in cooling phase => calculation of temperatures in steel beam and in joints. - PowerPoint PPT Presentation
Transcript of Distribution of temperature in steel and composite beams and joints under natural fire
Distribution of temperature in steel and composite beams and joints under natural fire
F. Hanus (B.E.S.T. design office) & J.-M. Franssen (Univ. of Liege)
More info on http://hdl.handle.net/2268/66090
Motivation: analysis of connections in cooling phase => calculation of temperatures in steel beam and in joints.
Existing « lumped capacitance » method:
heatingtaaamshdnetdtransferre QVctAkhQ ,,
OK for unprotected steel sections (heating and cooling)OK for protected steel sections (heating)OK for lower half of a steel beam with a slab on the upper flangeNot OK for the upper part of the steel beam with a slab
New « Heat exchange » method for T in the upper flange.
heatingtaaaconcretebottomtopgasdtransferre QVcQQQQ ,
X
Y
Z
Diamond 2009.a.4 for SAFIR
FILE: IPE300mixte
NODES: 1042
ELEMENTS: 894
CONTOUR PLOT
TEMPERATURE PLOT
TIME: 1800 sec822.90
800.00
775.00
750.00
725.00
700.00
675.00
650.00
625.00
600.00
575.00
550.00
525.00
500.00
21.90
More info on http://hdl.handle.net/2268/66090
concreteQ
G = 0.4 G = 0.7 G = 1 G = 1.5 G = 2Flux (kW/m²) Flux (kW/m²) Flux (kW/m²) Flux (kW/m²) Flux (kW/m²)
20 0 0 0 0 0150 17 20 23 26 28475 24 28 31 34 36
Given by an equation obtained from curve fitting with numerical results based on Annex A of EN 1991-1-2 parametric fire curves
Contains 2 parameters
0
5
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0 200 400 600 800 1000
Temperature (°C)
Flu
x fl
ang
e-sl
ab (
kW/m
²)
G = 0.4G = 0.7G = 1.0G = 1.5G = 2.0Série1Série2Série4Série5Série6 -15
-10
-5
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0 100 200 300 400 500 600 700 800 900
Temperature (°C)
Flu
x fl
ang
e-sl
ab (
kW/m
²)G = 0.4G = 0.7G = 1.0G = 1.5G = 2.0Série1Série2Série4Série5Série6
During heating During heating and cooling
More info on http://hdl.handle.net/2268/66090
0
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0 30 60 90 120 150
Tem
pe
ratu
re (
°C)
Time (min)
Parametric Fire Curve
SAFIR 2D-Model
Heat Exchange Method
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900
0 30 60 90 120 150
Tem
pe
ratu
re (
°C)
Time (min)
Parametric Fire Curve
SAFIR 2D-Model
Heat Exchange Method
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600
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0 20 40 60 80 100 120
Tem
pe
ratu
re (
°C)
Time (min)
Param. Fire Curve
Bottom Flange SAFIR
Bottom Flange Analytical
Top Flange Composite SAFIR
Top Flange Composite Analytical
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0 20 40 60 80 100 120
Tem
pe
ratu
re (°
C)
Time (min)
Param. Fire Curve
Bottom Flange SAFIR
Bottom Flange Analytical
Top Flange Composite SAFIR
Top Flange Composite Analytical
IPE300 IPE550
30’ fire
60’ fire
More info on http://hdl.handle.net/2268/66090
Works also for the temperature of the upper flange in the joint region
