EN 1994-1-2:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Eurocode 4 - Design of composite steel and concrete structures - Part 1-2: General rules - Structural fire designEvrokod 4: Projektiranje sovprežnih konstrukcij iz jekla in betona – 1-2. del: Splošna pravila – Požarnoodporno projektiranjeEurocode 4 - Calcul des structures mixtes acier-béton - Partie 1-2: Regles générales - Calcul du comportement au feuEurocode 4: Bemessung und Konstruktion von Verbundtragwerken aus Stahl und Beton - Teil 1-2: Allgemeine Regeln Tragwerksbemessung für den BrandfallTa slovenski standard je istoveten z:EN 1994-1-2:2005SIST EN 1994-1-2:2006en91.080.10Kovinske konstrukcijeMetal structures91.080.40Betonske konstrukcijeConcrete structures13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elements91.010.30Technical aspectsICS:SIST ENV 1994-1-2:2004/AC:2004SIST ENV 1994-1-2:20041DGRPHãþDSLOVENSKI
STANDARDSIST EN 1994-1-2:200601-februar-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1994-1-2August 2005ICS 13.220.50; 91.010.30; 91.080.10; 91.080.40Supersedes ENV 1994-1-2:1994
English VersionEurocode 4 - Design of composite steel and concrete structures- Part 1-2: General rules - Structural fire designEurocode 4 - Calcul des structures mixtes acier-béton -Partie 1-2: Règles générales - Calcul du comportement aufeuEurocode 4 - Bemessung und Konstruktion vonVerbundtragwerken aus Stahl und Beton - Teil 1-2:Allgemeine Regeln Tragwerksbemessung im BrandfallThis European Standard was approved by CEN on 4 November 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1994-1-2:2005: E

2 Contents
Page
Foreword .5
Background of the Eurocode programme.5 Status and field of application of Eurocodes.6 National Standards implementing Eurocodes.6 Links between Eurocodes and harmonised technical specifications (ENs and ETAs) for products.7 Additional information specific for EN 1994-1-2.7 National annex for EN 1994-1-2.10
Section 1 General.11
1.1 Scope.11 1.2 Normative references.13 1.3
Assumptions.15 1.4
Distinction between Principles and Application Rules.15 1.5
Definitions.15 1.5.1
Special terms relating to design in general…………………….…………………….15 1.5.2
Terms relating to material and products properties.16 1.5.3
Terms relating to heat transfer analysis.16 1.5.4
Terms relating to mechanical behaviour analysis.16 1.6 Symbols.16
Section 2 Basis of design.26
2.1
Requirements.26 2.1.1
Basic requirements.26 2.1.2
Nominal fire exposure.26 2.1.3
Parametric fire exposure.27 2.2 Actions.27 2.3 Design values of material properties.27 2.4 Verification methods.28 2.4.1
General.28 2.4.2
Member analysis.29 2.4.3
Analysis of part of the structure.30 2.4.4
Global structural analysis.31
Section 3 Material properties.31
3.1
General.31 3.2
Mechanical properties.31 3.2.1
Strength and deformation properties of structural steel.31 3.2.2
Strength and deformation properties of concrete.33 3.2.3
Reinforcing steels.35 3.3 Thermal properties.36 3.3.1
Structural and reinforcing steels.36 3.3.2
Normal weight concrete.39 3.3.3
Light weight concrete.41 3.3.4
Fire protection materials.42 3.4 Density.42

3Section 4 Design procedures ………………………………………………………………….43
4.1 Introduction.43 4.2 Tabulated data.44 4.2.1
Scope of application.44 4.2.2
Composite beam comprising steel beam with partial concrete encasement.45 4.2.3
Composite columns.47 4.3 Simple Calculation Models.51 4.3.1
General rules for composite slabs and composite beams.51 4.3.2
Unprotected composite slabs.51 4.3.3
Protected composite slabs.52 4.3.4
Composite beams.53 4.3.5
Composite columns.61 4.4 Advanced calculation models.64 4.4.1
Basis of analysis.64 4.4.2
Thermal response.65 4.4.3
Mechanical response.65 4.4.4
Validation of advanced calculation models.65
Section 5 Constructional details.66
5.1 Introduction.66 5.2 Composite beams.66 5.3 Composite columns.67 5.3.1
Composite columns with partially encased steel sections.67 5.3.2
Composite columns with concrete filled hollow sections.67 5.4 Connections between composite beams and columns.68 5.4.1
General.68 5.4.2 Connections between composite beams and composite columns with steel sections encased in concrete.69 5.4.3 Connections between composite beams and composite columns with partially encased steel sections.70 5.4.4 Connections between composite beams and composite columns with concrete filled hollow sections.70 Annex A (INFORMATIVE)
Stress-strain relationships at elevated temperatures for
structural steels
Annex B (INFORMATIVE)
Stress-strain relationships at elevated temperatures for
concrete with siliceous aggregate
Annex C (INFORMATIVE) Concrete stress-strain relationships adapted to natural fires
with a decreasing heating branch for use in advanced
calculation models
Annex D (INFORMATIVE)
Model for the calculation of the fire resistance of unprotected composite slabs exposed to fire beneath the slab according to the standard temperature-time curve
D.1 Fire resistance according to thermal insulation 79 D.2 Calculation of the sagging moment resistance Mfi,Rd+ 80 D.3 Calculation of the hogging moment resistance Mfi,Rd- 82 D.4 Effective thickness of a composite slab 84 D.5 Field of application
4 Annex E (INFORMATIVE) Model for the calculation of the sagging and hogging moment resistances of a steel beam connected to a concrete slab and exposed to fire beneath the concrete slab.
E.1 Calculation of the sagging moment resistance Mfi,Rd+ 86 E.2 Calculation of the hogging moment resistance Mfi,Rd- at an intermediate support
(or at a restraining support) 87 E.3 Local resistance at supports 88 E.4 Vertical shear resistance 89
Annex F (INFORMATIVE)
Model for the calculation of the sagging and hogging moment resistances of a partially encased steel beam connected to a concrete slab and exposed to fire beneath the concrete slab according to the standard temperature-time curve. 90
F.1 Reduced cross-section for sagging moment resistance Mfi,Rd+ 90 F.2 Reduced cross-section for hogging moment resistance Mfi,Rd- 94 F.3 Field of application
Annex G (INFORMATIVE)
Balanced summation model for the calculation of the fire resistance of composite columns with partially encased
steel sections, for bending around the weak axis, exposed
to fire all around the column according to the standard temperature-time curve.
96 G.1 Introduction 96 G.2 Flanges of the steel profile 97 G.3
Web of the steel profile 97 G.4
Concrete 98 G.5 Reinforcing bars 99 G.6 Calculation of the axial buckling load at elevated temperatures 100 G.7 Eccentricity of loading 101 G.8 Field of application 101
Annex H (INFORMATIVE)
Simple calculation model for concrete filled hollow sections exposed to fire all around the column according to the standard temperature-time curve. 104
H.1 Introduction 104 H.2
Temperature distribution 104 H.3 Design axial buckling load at elevated temperature 104 H.4 Eccentricity of loading 105 H.5 Field of application
Anne
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