EN 1993-1-1 Design of steel structures - Part 1-1 General rules and rules for buildings

EUROPEAN STANDARD
NORME EUROPEENNE
EUROPAISCHE NORM
FINAL DRAFT
prEN 1993-1-1
December 2003
ICS 91.010.30
Will supersede ENV 1993-1-1:1992
English version
Eurocode 3: Design of steel structures - Part 1-1: General rules
and rules for buildings
Eurocode 3: Calcul des structures en acier - Partie 1-1:
Regles generales et regles pour les batiments
Eurocode 3: Bemessung und Konstruktion von Stahlbauten
- Teil 1-1: Allgemeine Bemessungsregeln und Regeln fur
den Hochbau
This draft European Standard is submitted to CEN members for formal vote. It has been drawn up by the Technical Committee CEN/TC
250.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has
the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITE EUROPEEN DE NORMALISATION
EUROPAISCHES KOMITEE FUR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
Ref. No. prEN 1993-1-1:2003 E
prEN 1993-1-1 : 2003 (E)
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Content
Page
Foreword
5
1 General
9
1.1 Scope
9
1.1.1 Scope of Eurocode 3
9
1.1.2 Scope of Part 1.1 of Eurocode 3
10
1.2 Normative references
10
1.2.1 General reference standards
10
1.2.2 Weldable structural steel reference standards
10
1.3 Assumptions
11
1.4 Distinction between principles and application rules
11
1.5 Terms and definitions
11
1.6 Symbols
12
1.7 Conventions for member axes
20
2 Basis of design
22
2.1 Requirements
22
2.1.1 Basic requirements
22
2.1.2 Reliability management
22
2.1.3 Design working life, durability and robustness
22
2.2 Principles of limit state design
23
2.3 Basic variables
23
2.3.1 Actions and environmental influences
23
2.3.2 Material and product properties
23
2.4 Verification by the partial factor method
23
2.4.1 Design values of material properties
23
2.4.2 Design values of geometrical data
23
2.4.3 Design resistances
24
2.4.4 Verification of static equilibrium (EQU)
24
2.5 Design assisted by testing
24
3 Materials
25
3.1 General
25
3.2 Structural steel
25
3.2.1 Material properties
25
3.2.2 Ductility requirements
25
3.2.3 Fracture toughness
25
3.2.4 Through-thickness properties
27
3.2.5 Tolerances
28
3.2.6 Design values of material coefficients
28
3.3 Connecting devices
28
3.3.1 Fasteners
28
3.3.2 Welding consumables
28
3.4 Other prefabricated products in buildings
28
4 Durability
28
prEN 1993-1-1 : 2003 (E)
3
5 Structural analysis
29
5.1 Structural modelling for analysis
29
5.1.1 Structural modelling and basic assumptions
29
5.1.2 Joint modelling
29
5.1.3 Ground-structure interaction
29
5.2 Global analysis
30
5.2.1 Effects of deformed geometry of the structure
30
5.2.2 Structural stability of frames
31
5.3 Imperfections
32
5.3.1 Basis
32
5.3.2 Imperfections for global analysis of frames
33
5.3.3 Imperfection for analysis of bracing systems
36
5.3.4 Member imperfections
38
5.4 Methods of analysis considering material non-linearities
38
5.4.1 General
38
5.4.2 Elastic global analysis
39
5.4.3 Plastic global analysis
39
5.5 Classification of cross sections
40
5.5.1 Basis
40
5.5.2 Classification
40
5.6 Cross-section requirements for plastic global analysis
41
6 Ultimate limit states
45
6.1 General
45
6.2 Resistance of cross-sections
45
6.2.1 General
45
6.2.2 Section properties
46
6.2.3 Tension
49
6.2.4 Compression
49
6.2.5 Bending moment
50
6.2.6 Shear
50
6.2.7 Torsion
52
6.2.8 Bending and shear
53
6.2.9 Bending and axial force
54
6.2.10 Bending, shear and axial force
56
6.3 Buckling resistance of members
56
6.3.1 Uniform members in compression
56
6.3.2 Uniform members in bending
60
6.3.3 Uniform members in bending and axial compression
64
6.3.4 General method for lateral and lateral torsional buckling of structural components
65
6.3.5 Lateral torsional buckling of members with plastic hinges
67
6.4 Uniform built-up compression members
69
6.4.1 General
69
6.4.2 Laced compression members
71
6.4.3 Battened compression members
72
6.4.4 Closely spaced built-up members
74
7 Serviceability limit states
75
7.1 General
75
7.2 Serviceability limit states for buildings
75
7.2.1 Vertical deflections
75
7.2.2 Horizontal deflections
75
7.2.3 Dynamic effects
75
prEN 1993-1-1 : 2003 (E)
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Annex A [informative] -- Method 1: Interaction factors kij for interaction formula in 6.3.3(4)
76
Annex B [informative] -- Method 2: Interaction factors kij for interaction formula in 6.3.3(4)
78
Annex AB [informative] -- Additional design provisions
80
AB.1 Structural analysis taking account of material non-linearities
80
AB.2 Simplified provisions for the design of continuous floor beams
80
Annex BB [informative] -- Buckling of components of building structures
81
BB.1 Flexural buckling of members in triangulated and lattice structures
81
BB.1.1 General
81
BB.1.2 Angles as web members
81
BB.1.3 Hollow sections as members
81
BB.2 Continuous restraints
82
BB.2.1 Continuous lateral restraints
82
BB.2.2 Continuous torsional restraints
82
BB.3 Stable lengths of segment containing plastic hinges for out-of-plane buckling
83
BB.3.1 Uniform members made of rolled sections or equivalent welded I-sections
83
BB.3.2 Haunched or tapered members made of rolled sections or equivalent welded I-sections 87
BB.3.3 Modification factors for moment gradients in members laterally restrained along the
tension flange
88
prEN 1993-1-1 : 2003 (E)
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Foreword
This document (prEN 1993-1-1: 2003) has been prepared by Technical Committee CEN/TC 250 "Structural
Eurocodes", the secretariat of which is held be BSI.
This document is currently submitted to the Formal Vote.
This document will supersede ENV 1993-1-1.
Background of the Eurocode programme
In 1975, the Commission of the European Community decided on an action programme in the field of
construction, based on article 95 of the Treaty. The objective of the programme was the elimination of
technical obstacles to trade and the harmonisation of technical specifications.
Within this action programme, the Commission took the initiative to establish a set of harmonised technical
rules for the design of construction works which, in a first stage, would serve as an alternative to the national
rules in force in the Member States and, ultimately, would replace them.
For fifteen years, the Commission, with the help of a Steering Committee with Representatives of Member
States, conducted the development of the Eurocodes programme, which led to the first generation of
European codes in the 1980s.
In 1989, the Commission and the Member States of the EU and EFTA decided, on the basis of an agreement1
between the Commission and CEN, to transfer the preparation and the publication of the Eurocodes to the
CEN through a series of Mandates, in order to provide them with a future status of European Standard (EN).
This links de facto the Eurocodes with the provisions of all the Council's Directives and/or Commission's
Decisions dealing with European standards (e.g. the Council Directive 89/106/EEC on construction products
-- CPD -- and Council Directives 93/37/EEC, 92/50/EEC and 89/440/EEC on public works and services and
equivalent EFTA Directives initiated in pursuit of setting up the internal market).
The Structural Eurocode programme comprises the following standards generally consisting of a number of
Parts:
EN 1990 Eurocode: Basis of structural design
EN 1991 Eurocode 1: Actions on structures
EN 1992 Eurocode 2: Design of concrete structures
EN 1993 Eurocode 3: Design of steel structures
EN 1994 Eurocode 4: Design of composite steel and concrete structures
EN 1995 Eurocode 5: Design of timber structures
EN 1996 Eurocode 6: Design of masonry structures
EN 1997 Eurocode 7: Geotechnical design
EN 1998 Eurocode 8: Design of structures for earthquake resistance
EN 1999 Eurocode 9: Design of aluminium structures
Eurocode standards recognise the responsibility of regulatory authorities in each Member State and have
safeguarded their right to determine values related to regulatory safety matters at national level where these
continue to vary from State to State.
1 Agreement between the Commission of the European Communities and the European Committee for Standardisation (CEN)
concerning the work on EUROCODES for the design of building and civil engineering works (BC/CEN/03/89).
prEN 1993-1-1 : 2003 (E)
6
Status and field of application of Eurocodes
The Member States of the EU and EFTA recognise that Eurocodes serve as reference documents for the
following purposes :
-- as a means to prove compliance of building and civil engineering works with the essential requirements
of Council Directive 89/106/EEC, particularly Essential Requirement N°1 - Mechanical resistance and
stability - and Essential Requirement N°2 - Safety in case of fire;
-- as a basis for specifying contracts for construction works and related engineering services;
-- as a framework for drawing up harmonised technical specifications for construction products (ENs and
ETAs)
The Eurocodes, as far as they concern the construction works themselves, have a direct relationship with the
Interpretative Documents2 referred to in Article 12 of the CPD, although they are of a different nature from
harmonised product standard3. Therefore, technical aspects arising from the Eurocodes work need to be
adequately considered by CEN Technical Committees and/or EOTA Working Groups working on product
standards with a view to achieving a full compatibility of these technical specifications with the Eurocodes.
The Eurocode standards provide common structural design rules for everyday use for the design of whole
structures and component products of both a traditional and an innovative nature. Unusual forms of
construction or design conditions are not specifically covered and additional expert consideration will be
required by the designer in such cases.
National Standards implementing Eurocodes
The National Standards implementing Eurocodes will comprise the full text of the Eurocode (including any
annexes), as published by CEN, which may be preceded by a National title page and National foreword, and
may be followed by a National annex (informative).
The National Annex (informative) may only contain information on those parameters which are left open in
the Eurocode for national choice, known as Nationally Determined Parameters, to be used for the design of
buildings and civil engineering works to be constructed in the country concerned, i.e. :
-- values for partial factors and/or classes where alternatives are given in the Eurocode,
-- values to be used where a symbol only is given in the Eurocode,
-- geographical and climatic data specific to the Member State, e.g. snow map,
-- the procedure to be used where alternative procedures are given in the Eurocode,
-- references to non-contradictory complementary information to assist the user to apply the Eurocode.
Links between Eurocodes and product harmonised technical specifications (ENs
and ETAs)
There is a nee...