Nederlandse norm NEN-EN (en) Eurocode 2: Ontwerp en berekening van betonconstructies - Deel 1-1: Algemene regels en regels voor gebouwen

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1 Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Nederlandse norm NEN-EN (en) Eurocode 2: Ontwerp en berekening van betonconstructies - Deel 1-1: Algemene regels en regels voor gebouwen Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings Zal vervangen NVN-ENV :1997; NAD-NVN-ENV :1995; NVN-ENV :1994; NAD-NVN-ENV :2002; NVN-ENV :1994; NAD-NVN-ENV :2002; NVN-ENV :1994; NAD-NVN-ENV :2002; NVN-ENV :1994; NAD-NVN-ENV :2002; NVN-ENV :1999 ICS ; april 2005

2 NEN-EN Als Nederlandse norm is aanvaard: - EN :2004,IDT Normcommissie "Technische Grondslagen voor Bouwconstructies" Apart from exceptions provided by the law, nothing from this publication may be duplicated and/or published by means of photocopy, microfilm, storage in computer files or otherwise, which also applies to full or partial processing, without the written consent of the Netherlands Standardization Institute. The Netherlands Standardization Institute shall, with the exclusion of any other beneficiary, collect payments owed by third parties for duplication and/or act in and out of law, where this authority is not transferred or falls by right to the Reproduction Rights Foundation. Auteursrecht voorbehouden. Behoudens uitzondering door de wet gesteld mag zonder schriftelijke toestemming van het Nederlands Normalisatie-instituut niets uit deze uitgave worden verveelvoudigd en/of openbaar gemaakt door middel van fotokopie, microfilm, opslag in computerbestanden of anderszins, hetgeen ook van toepassing is op gehele of gedeeltelijke bewerking. Het Nederlands Normalisatie-instituut is met uitsluiting van ieder ander gerechtigd de door derden verschuldigde vergoedingen voor verveelvoudiging te innen en/of daartoe in en buiten rechte op te treden, voor zover deze bevoegdheid niet is overgedragen c.q. rechtens toekomt aan de Stichting Reprorecht. Although the utmost care has been taken with this publication, errors and omissions cannot be entirely excluded. The Netherlands Standardization Institute and/or the members of the committees therefore accept no liability, not even for direct or indirect damage, occurring due to or in relation with the application of publications issued by the Netherlands Standardization Institute. Hoewel bij deze uitgave de uiterste zorg is nagestreefd, kunnen fouten en onvolledigheden niet geheel worden uitgesloten. Het Nederlands Normalisatie-instituut en/of de leden van de commissies aanvaarden derhalve geen enkele aansprakelijkheid, ook niet voor directe of indirecte schade, ontstaan door of verband houdend met toepassing van door het Nederlands Normalisatie-instituut gepubliceerde uitgaven Nederlands Normalisatie-instituut Postbus 5059, 2600 GB Delft Telefoon (015) , Fax (015)

3 NEN-EN Nederlands voorwoord Waarschuwing De publicatie van deze norm is een tussenfase in de uniformering van de technische grondslagen voor berekening van bouwconstructies in Europa. Na publicatie van deze norm wordt gewerkt aan een vertaling in het Nederlands en aan het opstellen van de nationale bijlage. In deze nationale bijlage worden de nationaal vast te stellen parameterwaarden gegeven, waarmee per land het vereiste veiligheidsniveau wordt bereikt. In Nederland wordt gestreefd naar eenzelfde niveau van betrouwbaarheid als bij toepassing van 5.3 van NEN Na publicatie van de nationale bijlage en de normtekst in het Nederlands zal naar verwachting een coëxistentieperiode van 2 tot 3 jaar ingaan, waarin deze norm naast NEN 6720 voor toepassing beschikbaar is. Uiteindelijk zal deze norm NEN 6720 geheel vervangen; nl. bij intrekking van NEN De datum van intrekking van NEN 6720 is vooralsnog gesteld op Pas nadat de nationale bijlage is gepubliceerd en de normtekst in het Nederlands is verschenen, kan vanuit wettelijke regelingen (Bouwbesluit 2003 en Arbeidsomstandighedenbesluit) van deze norm in principe gebruik worden gemaakt. Men kan met de voorliggende uitgave dus nog niet aantonen dat is voldaan aan de minimumeisen van constructieve veiligheid van deze wettelijke regelingen. Deze norm kan wel worden gebruikt voor het wennen aan de methode, voor het ontwikkelen van software en voor het voorbereiden van cursussen over de Eurocodes. Notice Dutch foreword The publication of this standard is an intermediate phase in the harmonisation of technical principles for design of building structures in Europe. After publication of this standard work will start on the translation into Dutch and on the formulation of the National Annex. In this National Annex the values of the Nationally Determined Parameters will be given, by which the required level of safety for each member country is attained. In the Netherlands the same level of safety as attained by application of 5.3 of NEN 6700 is strived for. After publication of the National Annex and the standard in Dutch the start of a period of co-existence of 2 to 3 years is anticipated, where this standard will be available for application as an alternative to NEN Eventually this standard will replace NEN 6720 completely, i.e. at the withdrawal of NEN The date of withdrawal of NEN 6720 for the moment is set on Only after the National Annex has been published and the standard has been translated into Dutch, legislation (Building Decree 2003 and Decree on Working conditions) may, in principle, refer to this standard for application (in the framework of Dutch law). With the present publication compliance with the minimum requirements on structural safety in these national regulations cannot be demonstrated yet. This standard can however be applied for "getting accustomed" to the methods, for developing of software and for preparing courses on Eurocodes.

4 NEN-EN Voor de in deze norm vermelde normatieve verwijzingen bestaan in Nederland de volgende equivalenten: vermelde norm Nederlandse norm titel EN 1990 NEN-EN 1990 Eurocode - Grondslag van het constructief ontwerp (en) EN NEN-EN Eurocode 1: Belastingen op constructies - Deel 1-5: Algemene belastingen - Thermische belasting (en) EN NEN-EN Eurocode 1: Belastingen op constructies - Deel 1-6: Algemene belastingen - Belastingen tijdens uitvoering (en) EN EN NEN-EN Cement - Deel 1: Samenstelling, specificatie en conformiteitscriteria voor gewone cementsoorten (en,nl) EN NEN-EN Beton - Deel 1: Specificatie, eigenschappen, vervaardiging en conformiteit (en,nl) EN EN NEN-EN Staal voor het wapenen van beton - Lasbaar betonstaal - Algemeen (en) EN EN ISO ENV NVN-ENV Het vervaardigen van betonconstructies - Deel 1: Algemeen gedeelte (en) EN EN ISO

5 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN December 2004 ICS ; Supersedes ENV :1991, ENV :1994, ENV :1994, ENV :1994, ENV :1994, ENV :1998 English version Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings Eurocode 2: Calcul des structures en béton - Partie 1-1 : Règles générales et règles pour les bâtiments Eurocode 2: Bemessung und konstruktion von Stahlbetonund Spannbetontragwerken - Teil 1-1: Allgemeine Bemessungsregeln und Regeln für den Hochbau This European Standard was approved by CEN on 16 April 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. Up-to-date lists and bibliographical references concerning such national standards 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. 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 STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN :2004: E

6 Contents List 1. General 1.1 Scope Scope of Eurocode Scope of Part 1-1 of Eurocode Normative references General reference standards Other reference standards 1.3 Assumptions 1.4 Distinction between principles and application rules 1.5 Definitions General Additional terms and definitions used in this Standard Precast structures Plain or lightly reinforced concrete members Unbonded and external tendons Prestress 1.6 Symbols 2. Basis of design 2.1 Requirements Basic requirements Reliability management Design working life, durability and quality management 2.2 Principles of limit state design 2.3 Basic variables Actions and environment influences General Thermal effects Differential settlements/movements Prestress Material and product properties General Shrinkage and creep Deformations of concrete Geometric data General Supplementary requirements for cast in place piles 2.4 Verification by the partial factor method General Design values Partial factor for shrinkage action Partial factors for prestress Partial factor for fatigue loads Partial factors for materials Partial factors for materials for foundations Combinations of actions Verification of static equilibrium - EQU 2.5 Design assisted by testing 2.6 Supplementary requirements for foundations 2.7 Requirements for fastenings 2

7 3. Materials 3.1 Concrete General Strength Elastic deformation Creep and shrinkage Stress-strain relation for non-linear structural analysis Design compressive and tensile strengths Stress-strain relations for the design of sections Flexural tensile strength Confined concrete 3.2 Reinforcing steel General Properties Strength Ductility characteristics Welding Fatigue Design assumptions 3.3 Prestressing steel General Properties Strength Ductility characteristics Fatigue Design assumptions Prestressing tendons in sheaths 3.4 Prestressing devices Anchorages and couplers General Mechanical properties Anchored tendons Anchored devices and anchorage zones External non-bonded tendons General Anchorages 4. Durability and cover to reinforcement 4.1 General 4.2 Environmental conditions 4.3 Requirements for durability 4.4 Methods of verifications Concrete cover General Minimum cover, c min Allowance in design for tolerance 5. Structural analysis 5.1 General General requirements Special requirements for foundations Load cases and combinations Second order effects 3

8 5.2 Geometric imperfections 5.3 Idealisation of the structure Structural models for overall analysis Geometric data Effective width of flanges (all limit states) Effective span of beams and slabs in buildings 5.4 Linear elastic analysis 5.5 Linear analysis with limited redistribution 5.6 Plastic analysis General Plastic analysis for beams, frames and slabs Rotation capacity Analysis with struts and tie models 5.7 Non-linear analysis 5.8 Analysis of second order effects with axial load Definitions General Simplified criteria for second order effects Slenderness Criterion for isolated members Slenderness and effective length of isolated members Global second order effects in buildings Creep Methods of analysis General method Method based on nominal stiffness General Nominal stiffness Moment magnification factor Method based on nominal curvature General Bending moments Curvature Biaxial bending 5.9 Lateral instability of slender beams 5.10 Prestressed members and structures General Prestressing force during tensioning Maximum stressing force Limitation of concrete stress Measurements Prestress force Immediate losses of prestress for pre-tensioning Immediate losses of prestress for post-tensioning Losses due to the instantaneous deformation of concrete Losses due to friction Losses at anchorage Time dependent losses of prestress for pre- and post-tensioning Consideration of prestress in analysis Effects of prestressing at ultimate limit state Effects of prestressing at serviceability limit state and limit state of fatigue 5.11 Analysis for some particular structural members 4

9 6. Ultimate limit states (ULS) 6.1 Bending with or without axial force 6.2 Shear General verification procedure Members not requiring design shear reinforcement Members requiring design shear reinforcement Shear between web and flanges of T-sections Shear at the interface between concretes cast at different times 6.3 Torsion General Design procedure Warping torsion 6.4 Punching General Load distribution and basic control perimeter Punching shear calculation Punching shear resistance of slabs and column bases without shear reinforcement Punching shear resistance of slabs and column bases with shear reinforcement 6.5 Design with strut and tie models General Struts Ties Nodes 6.6 Anchorages and laps 6.7 Partially loaded areas 6.8 Fatigue Verification conditions Internal forces and stresses for fatigue verification Combination of actions Verification procedure for reinforcing and prestressing steel Verification using damage equivalent stress range Other verifications Verification of concrete under compression or shear 7. Serviceability limit states (SLS) 7.1 General 7.2 Stress limitation 7.3 Crack control General considerations Minimum reinforcement areas Control of cracking without direct calculation Calculation of crack widths 7.4 Deflection control General considerations Cases where calculations may be omitted Checking deflections by calculation 8 Detailing of reinforcement and prestressing tendons - General 8.1 General 8.2 Spacing of bars 8.3 Permissible mandrel diameters for bent bars 8.4 Anchorage of longitudinal reinforcement General 5

10 8.4.2 Ultimate bond stress Basic anchorage length Design anchorage length 8.5 Anchorage of links and shear reinforcement 8.6 Anchorage by welded bars 8.7 Laps and mechanical couplers General Laps Lap length Transverse reinforcement in the lap zone Transverse reinforcement for bars in tension Transverse reinforcement for bars permanently in compression Laps for welded mesh fabrics made of ribbed wires Laps of the main reinforcement Laps of secondary or distribution reinforcement 8.8 Additional rules for large diameter bars 8.9 Bundled bars General Anchorage of bundles of bars Lapping bundles of bars 8.10 Prestressing tendons Arrangement of prestressing tendons and ducts General Pre-tensioned tendons Post-tension ducts Anchorage of pre-tensioned tendons General Transfer of prestress Anchorage of tensile force for the ultimate limit state Anchorage zones of post-tensioned members Anchorages and couplers for prestressing tendons Deviators 9. Detailing of members and particular rules 9.1 General 9.2 Beams Longitudinal reinforcement Minimum and maximum reinforcement areas Other detailing arrangements Curtailment of the longitudinal tension reinforcement Anchorage of bottom reinforcement at an end support Anchorage of bottom reinforcement at intermediate supports Shear reinforcement Torsion reinforcement Surface reinforcement Indirect supports 9.3 Solid slabs Flexural reinforcement General Reinforcement in slabs near supports Corner reinforcement Reinforcement at the free edges 6

11 9.3.2 Shear reinforcement 9.4 Flat slabs Slab at internal columns Slab at edge columns Punching shear reinforcement 9.5 Columns General Longitudinal reinforcement Transverse reinforcement 9.6 Walls General Vertical reinforcement Horizontal reinforcement Transverse reinforcement 9.7 Deep beams 9.8 Foundations Pile caps Column and wall footings General Anchorage of bars Tie beams Column footing on rock Bored piles 9.9 Regions with discontinuity in geometry or action 9.10 Tying systems General Proportioning of ties General Peripheral ties Internal ties Horizontal ties to columns and/or walls Vertical ties Continuity and anchorage of ties 10. Additional rules for precast concrete elements and structures 10.1 General Special terms used in this section 10.2 Basis of design, fundamental requirements 10.3 Materials Concrete Strength Creep and shrinkage Prestressing steel Technological properties of prestressing steel 10.5 Structural analysis General Losses of prestress 10.9 Particular rules for design and detailing Restraining moments in slabs Wall to floor connections Floor systems Connections and supports for precast elements 7

12 Materials General rules for design and detailing of connections Connections transmitting compressive forces Connections transmitting shear forces Connections transmitting bending moments or tensile forces Half joints Anchorage of reinforcement at supports Bearings General Bearings for connected (non-isolated) members Bearings for isolated members Pocket foundations General Pockets with keyed surfaces Pockets with smooth surfaces Tying systems 11. Lightweight aggregated concrete structures 11.1 General Scope Special symbols 11.2 Basis of design 11.3 Materials Concrete Elastic deformation Creep and shrinkage Stress-strain relations for structural analysis Design compressive and tensile strengths Stress-strain relations for the design of sections Confined concrete 11.4 Durability and cover to reinforcement Environmental conditions Concrete cover and properties of concrete 11.5 Structural analysis Rotational capacity 11.6 Ultimate limit states Members not requiring design shear reinforcement Members requiring design shear reinforcement Torsion Design procedure Punching Punching shear resistance of slabs and column bases without shear reinforcement Punching shear resistance of slabs and column bases with shear reinforcement Partially loaded areas Fatigue 11.7 Serviceability limit states 11.8 Detailing of reinforcement - General Permissible mandrel diameters for bent bars Ultimate bond stress 11.9 Detailing of members and particular rules 8

13 11.10 Additional rules for precast concrete elements and structures Plain and lightly reinforced concrete structures 12. Plain and lightly reinforced concrete structures 12.1 General 12.2 Basis of design Strength 12.3 Materials Concrete: additional design assumptions 12.5 Structural analysis: ultimate Limit states 12.6 Ultimate limit states Design resistance to bending and axial force Local Failure Shear Torsion Ultimate limit states induced by structural deformation (buckling) Slenderness of columns and walls Simplified design method for walls and columns 12.7 Serviceability limit states 12.9 Detailing of members and particular rules Structural members Construction joints Strip and pad footings Annexes A (Informative) B (Informative) C (Normative) D (Informative) E (Informative) F (Informative) G (Informative) H (Informative) I (Informative) J (Informative) Modification of partial factors for materials Creep and shrinkage strain Reinforcement properties Detailed calculation method for prestressing steel relaxation losses Indicative Strength Classes for durability Reinforcement expressions for in-plane stress conditions Soil structure interaction Global second order effects in structures Analysis of flat slabs and shear walls Examples of regions with discontinuity in geometry or action Foreword This European Standard EN 1992, Eurocode 2: Design of concrete structures: General rules and rules for buildings, has been prepared by Technical Committee CEN/TC250 «Structural Eurocodes», the Secretariat of which is held by BSI. CEN/TC250 is responsible for all Structural Eurocodes. This European Standard shall be given the status of a National Standard, either by publication of an identical text or by endorsement, at the latest by June 2005, and conflicting National Standards shall be withdrawn at latest by March This Eurocode supersedes ENV , , , , and According to the CEN-CENELEC Internal Regulations, the National Standard Organisations of the following countries are bound to implement these European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, 9

14 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Background to 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 agreement 1 between the Commission and CEN, to transfer the preparation and the publication of the Eurocodes to 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 0: 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. 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 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). 10

15 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 Documents 2 referred to in Article 12 of the CPD, although they are of a different nature from harmonised product standards 3. 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 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. The National annex 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 and/or classes where alternatives are given in the Eurocode, values to be used where a symbol only is given in the Eurocode, country specific data (geographical, climatic, etc.), e.g. snow map, the procedure to be used where alternative procedures are given in the Eurocode. It may contain decisions on the application of informative annexes, references to non-contradictory complementary information to assist the user to apply the Eurocode. Links between Eurocodes and harmonised technical specifications (ENs and ETAs) for products There is a need for consistency between the harmonised technical specifications for 2 According to Art. 3.3 of the CPD, the essential requirements (ERs) shall be given concrete form in interpretative documents for the creation of the necessary links between the essential requirements and the mandates for harmonised ENs and ETAGs/ETAs. 3 According to Art. 12 of the CPD the interpretative documents shall : a) give concrete form to the essential requirements by harmonising the terminology and the technical bases and indicating classes or levels for each requirement where necessary ; b) indicate methods of correlating these classes or levels of requirement with the technical specifications, e.g. methods of calculation and of proof, technical rules for project design, etc. ; c) serve as a reference for the establishment of harmonised standards and guidelines for European technical approvals. The Eurocodes, de facto, play a similar role in the field of the ER 1 and a part of ER 2. 11

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