eurocodes applied to fire scenarios from a fire scenario to dimensioning [email protected]
TRANSCRIPT
Eurocodes applied to fire scenariosFrom a fire scenario to dimensioning
What are the Eurocodes?
A series of textbooks
containing recommendations
for calculating
the stability
of building structures
Redaction started in 1975, the Eurocodes were written on a voluntary base (by professional associations) with the support of the C.E.C., then a mandate was given to CEN in 1989.
Eurocodes (circa 1990)
prENV
ENV (circa 1995) + National Application Documents
prEN
EN (circa 2000-2005) +National Annexes
On a voluntary baseBecause of a contract
Because of a law
Requirements
On a voluntary baseBecause of a contract
Because of a law
Utilisation of the Eurocodes
Fire resistance = ….
Which law?
Basis norms• Annex 2 (low rise buildings)• Annex 3 (middle rise buildings)• Annex 4 (high rise buildings)• Annex 6 (industrial buildings)
Regional decrees
Etc
Requirements
Because of a law
On a voluntary baseBecause of a contract
Because of a law
Requirements
On a voluntary baseBecause of a contract
Because of a law
Utilisation of the Eurocodes
Fire resistance = ….
Which law ?
Pour l'évaluation de la résistance au feu d'éléments de construction, on peut utiliser: soit un essai selon NBN 713-020 soit une méthode de calcul, agréée par le Ministre de l'intérieur selon la procédure et les
conditions qu'il détermine. Pour utiliser cette méthode de calcul, il peut être tenu compte de: a) l'examen de scénarios d'incendie naturels (vient ensuite la description des conditions auxquelles les calculs de ce type doivent répondre) b) l'examen de scénarios d'incendie conventionnels.
Article 2 of Annex 1 of Basis Norms.
Because of a law
Utilisation of the Eurocodes
The fire resistance of a building element can be demonstrated,1. either by a fire test (used to be NBN 713-020, now EN’s)2. or by a calculation method approved by the Ministry of Interior.
As of today (October 2010), there is no approved method.
The following situation might be adopted:Approved method = Eurocodes For tabulated data, calculation can be made by the person responsible of the stability under room temperature. For simple calculation models: either the designer is approved, or the calculation is checked by an approved organisation. For general calculation models (F.E.) or utilisation of any natural fire curve: Derogation Commission.
8
En cas d’exposition à la courbe température-temps (NBN EN 1363-1), les éléments structurels de type II ne peuvent pas s’affaisser pendant une durée de temps qui équivaut à la durée de temps équivalente te,d (selon EN 1991-1-2:2002) dans laquelle q1 est déterminé sur la base du risque d’échec acceptable d’effondrement égal à 10-3 par an.
De structurele elementen type II mogen bij een blootstelling aan de standaard temperatuur-tijdkromme (NBN EN 1363-1) niet bezwijken binnen een tijdspanne gelijk aan de equivalente tijdsduur te,d (bepaald op basis van de norm EN 1991-1-2:2002), waarbij q1 bepaald is op basis van een aanvaardbare faalkans van instorting gelijk aan 10-3 per jaar.
Article 3.1 of Annex 6 of Basis Norms.
Which law ?
Because of a law
Utilisation of the Eurocodes
Eurocode number Ambient canditions Fire conditions
Basis of design EN 1990 -
Actions EN 1991-1-1 EN 1991-1-2
Concrete structures EN 1992-1-1 EN 1992-1-2
Steel structures EN 1993-1-1 EN 1993-1-2
Composite steel-concrete structures EN 1994-1-1 EN 1994-1-2
Timber structures EN 1995-1-1 EN 1995-1-2
Masonry structures EN 1996-1-1 EN 1996-1-2
Geotechnical design EN 1997 -
Earthquake resistance EN 1998 -
Aluminium alloy structures EN 1999-1-1 EN 1999-1-2
From fire scenario to dimensioning: general layout
Fire Scenario
T = f(x,y,z,t)
Mechanical loadsin the fire situation
M, N, V
Design methodR = x minutes
Thermal calculationMechanical calculation
Eurocode number Ambient canditions Fire conditions
Basis of design EN 1990 -
Actions EN 1991-1-1 EN 1991-1-2
Concrete structures EN 1992-1-1 EN 1992-1-2
Steel structures EN 1993-1-1 EN 1993-1-2
Composite steel-concrete structures EN 1994-1-1 EN 1994-1-2
Timber structures EN 1995-1-1 EN 1995-1-2
Masonry structures EN 1996-1-1 EN 1996-1-2
Geotechnical design EN 1997 -
Earthquake resistance EN 1998 -
Aluminium alloy structures EN 1999-1-1 EN 1999-1-2
From fire scenario to dimensioning: general layout
Fire Scenario
T = f(x,y,z,t)
Mechanical loads
M, N, V
Design methodR = x minutes
F0F0
F0
F0
F0F0
F0
F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0F0F0
F0F0F0F0F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0
X Y
Z
Diamond 2009.a.5 for SAFIR
FILE: bat
NODES: 1077
BEAMS: 520
TRUSSES: 0
SHELLS: 0
SOILS: 0
BEAMS PLOT
IMPOSED DOF PLOT
Beam Elem ent
From fire scenario to dimensioningMethod 1: Tabulated data
ISO fire
T = f(x,y,z,t)
Pd,fi = Gk
+ 0.5 qk,1
Load ratio mfi = pd,fi / pd
Tabulated dataElement by element
R = x minutes
F0F0
F0
F0
F0F0
F0
F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0F0F0
F0F0F0F0F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0
X Y
Z
Diamond 2009.a.5 for SAFIR
FILE: bat
NODES: 1077
BEAMS: 520
TRUSSES: 0
SHELLS: 0
SOILS: 0
BEAMS PLOT
IMPOSED DOF PLOT
DISTRIBUTED LOADS PLOT
Beam Elem ent
T = f(t)
Pd,fi = Gk
+ 0.5 qk,1
M, N ,V at t = 0
Simple calculation modelElement by element
R = x minutes
From fire scenario to dimensioningMethod 2: Simple calculation model
ISO fire
F0F0
F0
F0
F0F0
F0
F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0F0F0
F0F0F0F0F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0
X Y
Z
Diamond 2009.a.5 for SAFIR
FILE: bat
NODES: 1077
BEAMS: 520
TRUSSES: 0
SHELLS: 0
SOILS: 0
BEAMS PLOT
IMPOSED DOF PLOT
DISTRIBUTED LOADS PLOT
Beam Elem ent
X Y
Z
5.0 E+04 Nm
Diamond 2009.a.5 for SAFIR
FILE: bat
NODES: 1077
BEAMS: 520
TRUSSES: 0
SHELLS: 0
SOILS: 0
BEAMS PLOT
My BENDING MOMENT PLOT
TIME: 4 sec
T = f(x,y,t)
Pd,fi = Gk
+ 0.5 qk,1
M, N ,V at t = 0
From fire scenario to dimensioningMethod 3: Advanced calculation model
Any fire
Advanced calculation modelFor the whole structure
R = x minutes
F0F0
F0
F0
F0F0
F0
F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0F0F0
F0F0F0F0F0
F0F0
F0
F0F0F0
F0
F0
F0F0F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0 F0F0 F0F0
F0F0
F0
F0
F0F0 F0F0 F0F0
X Y
Z
Diamond 2009.a.5 for SAFIR
FILE: bat
NODES: 1077
BEAMS: 520
TRUSSES: 0
SHELLS: 0
SOILS: 0
BEAMS PLOT
IMPOSED DOF PLOT
DISTRIBUTED LOADS PLOT
Beam Elem ent
X
Y
Z
Diamond 2009.a.5 for SAFIR
FILE: colunmv3
NODES: 983
ELEMENTS: 1868
CONTOUR PLOT
TEMPERATURE PLOT
TIME: 3600 sec>Tmax
1000.00
900.00
800.00
700.00
600.00
500.00
400.00
300.00
200.00
100.00
26.00
Thank you