1、BRITISH STANDARDBS EN 1993-1-2:2005Eurocode 3: Design of steel structures Part 1-2: General rules Structural fire designICS 13.220.50; 91.010.30; 91.080.10Incorporating Corrigenda December 2005,September 2006and March 2009National forewordThis British Standard is the UK implementation of EN 1993-1-2
2、:2005, incorporating corrigenda December 2005 and March 2009. It supersedes DD ENV 1993-1-2:2001, which is withdrawn.The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN corrigendum. For ex
3、ample, text altered by December 2005 corrigendum is indicated by .The structural Eurocodes are divided into packages by grouping Eurocodes for each of the main materials: concrete, steel, composite concrete and steel, timber, masonry and aluminium; this is to enable a common date of withdrawal (DOW)
4、 for all the relevant parts that are needed for a particular design. The conflicting national standards will be withdrawn at the end of the co-existence period, after all the EN Eurocodes of a package are available.Following publication of the EN, there is a period allowed for national calibration d
5、uring which the National Annex is issued, followed by a co-existence period of a maximum three years. During the co-existence period Member States are encouraged to adapt their national provisions. At the end of this co-existence period, the conflicting parts of national standard(s) will be withdraw
6、n.In the UK, the primary corresponding national standard is:BS 5950-8:2003, Structural use of steelwork in building. Code of practice for fire resistant design BS EN 1993-1-2 supersedes BS 5950-8, which will be withdrawn by March 2010. The UK participation in its preparation was entrusted by Technic
7、al Committee B/525, Building and civil engineering structures, to Subcommittee B/525/31, Structural use of steel.A list of organizations represented on this subcommittee can be obtained on request to its secretary.Where a normative part of this EN allows for a choice to be made at the national level
8、, the range and possible choice will be given in the normative text as Recommended Values, and a note will qualify it as a Nationally Determined Parameter (NDP). NDPs can be a specific value for a factor, a specific level or class, a particular method or a particular application rule if several are
9、proposed in the EN.BS EN 1993-1-2:2005This British Standard, was published under the authority of the Standards Policy and Strategy Committee on29 April 2005 BSI 2010ISBN 978 0 580 66390 1Amendments/corrigenda issued since publicationAmd. No. Date Comments 16290 Corrigendum No. 1June 2006 Implementa
10、tion of CEN corrigendum December 200516572 Corrigendum No. 229 September 2006 Revision of national foreword and supersession details28 February 2010 Implementation of CEN corrigendum March 2009To enable EN 1993-1-2 to be used in the UK, the NDPs have been published in a National Annex, which has bee
11、n issued separately by BSI.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 1993-1-2:2005iblankEUROPEAN STANDARD NORME EUR
12、OPENNE EUROPISCHE NORMEN 1993-1-2 April 2005 ICS 13.220.50; 91.010.30; 91.080.10 Supersedes ENV 1993-1-2:1995Incorporating CorrigendumDecember 2005 English version Eurocode 3: Design of steel structures - Part 1-2: General rules -Structural fire design Eurocode 3: Calcul des structures en acier - Pa
13、rtie 1-2: Rgles gnrales - Calcul du comportement au feu Eurocode 3: Bemessung und Konstruktion von Stahlbauten - Teil 1-2: Allgemeine Regeln - Tragwerksbemessung fr den Brandfall This European Standard was approved by CEN on 23 April 2004. CEN members are bound to comply with the CEN/CENELEC Interna
14、l 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.
15、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
16、 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 Kin
17、gdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1993-1-2:2005: E
18、2Contents PageForeword .41. General 91.1 Scope 91.2 Normative references101.3 Assumptions .111.4 Distinction between principles and application rules.111.5 Terms and definitions .111.6 Symbols 122 Basis of design.162.1 Requirements162.1.1 Basic requirements .162.1.2 Nominal fire exposure 162.1.3 Par
19、ametric fire exposure.162.2 Actions172.3 Design values of material properties 172.4 Verification methods 172.4.1 General .172.4.2 Member analysis.182.4.3 Analysis of part of the structure .192.4.4 Global structural analysis .203 Material properties.203.1 General .203.2 Mechanical properties of carbo
20、n steels 203.2.1 Strength and deformation properties 203.2.2 Unit mass 203.3 Mechanical properties of stainless steels233.4 Thermal properties233.4.1 Carbon steels 233.4.2 Stainless steels 263.4.3 Fire protection materials.264 Structural fire design .274.1 General .274.2 Simple calculation models274
21、.2.1 General .274.2.2 Classification of cross-sections 284.2.3 Resistance .284.2.4 Critical temperature 364.2.5 Steel temperature development 374.3 Advanced calculation models.434.3.1 General .434.3.2 Thermal response434.3.3 Mechanical response.434.3.4 Validation of advanced calculation models44Anne
22、x A normative Strain-hardening of carbon steel at elevated temperatures.45Annex B normative Heat transfer to external steelwork .47Annex C informative Stainless steel 65Annex D informative Joints .73BS EN 1993-1-2:2005EN 1993-1-2:2005 (E)3Annex E informative Class 4 cross-sections .76BS EN 1993-1-2:
23、2005EN 1993-1-2:2005 (E)4Foreword This European Standard EN 1993, Eurocode 3: Design of steel structures, 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 s
24、hall be given the status of a National Standard, either by publication of an identical text or by endorsement, at the latest by October 2005, and conflicting National Standards shall be withdrawn atlatest by March 2010. This Eurocode supersedes ENV 1993-1-2. According to the CEN-CENELEC Internal Reg
25、ulations, the National Standard Organizations of the following countries are bound to implement these European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
26、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 pro
27、gramme was the elimination of technical obstacles to trade and the harmonization of technical specifications. Within this action programme, the Commission took the initiative to establish a set of harmonized technical rules for the design of construction works which, in a first stage, would serve as
28、 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 genera
29、tion 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 agreement1between 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 w
30、ith a future status of European Standard (EN). This links de facto the Eurocodes with the provisions of all the Councils Directives and/or Commissions Decisions dealing with European standards (e.g. the Council Directive 89/106/EEC on construction products - CPD - and Council Directives 93/37/EEC, 9
31、2/50/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 E
32、N 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 struct
33、ures EN 1997 Eurocode 7: Geotechnical design EN 1998 Eurocode 8: Design of structures for earthquake resistance EN 1999 Eurocode 9: Design of aluminium structures 1Agreement between the Commission of the European Communities and the European Committee for Standardisation (CEN) concerning the work on
34、 EUROCODES for the design of building and civil engineering works (BC/CEN/03/89).BS EN 1993-1-2:2005EN 1993-1-2:2005 (E)5Eurocode standards recognize the responsibility of regulatory authorities in each Member State and have safeguarded their right to determine values related to regulatory safety ma
35、tters 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 recognize that Eurocodes serve as reference documents for the following purposes : as a means to prove compliance of building and civil engineer
36、ing works with the essential requirements of Council Directive 89/106/EEC, particularly Essential Requirement N1 Mechanical resistance and stability and Essential Requirement N2 Safety in case of fire; as a basis for specifying contracts for construction works and related engineering services; as a
37、framework for drawing up harmonized 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 Documents2referred to in Article 12 of the CPD, although they are of a dif
38、ferent nature from harmonized product standards3. 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 specifica
39、tions 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 addit
40、ional 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
41、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 t
42、o 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 proced
43、ures 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. 2According to Art. 3.3 of the CPD, the essential requirements (ERs) shall be given concrete form in
44、interpretative documents for the creation of the necessary links between the essential requirements and the mandates for harmonized 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 harmonizing the termino
45、logy 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) se
46、rve as a reference for the establishment of harmonized 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. BS EN 1993-1-2:2005EN 1993-1-2:2005 (E)6Links between Eurocodes and harmonized technical specifi
47、cations (ENs and ETAs) for productsThere is a need for consistency between the harmonized technical specifications for construction products and the technical rules for works4. Furthermore, all the information accompanying the CE Marking of the construction products which refer to Eurocodes should c
48、learly mention which Nationally Determined Parameters have been taken into account.Additional information specific to EN 1993-1-2EN 1993-1-2 describes the principles, requirements and rules for the structural design of steel buildings exposed to fire, including the following aspects. Safety requirem
49、ents EN 1993-1-2 is intended for clients (e.g. for the formulation of their specific requirements), designers, contractors and relevant authorities. The general objectives of fire protection are to limit risks with respect to the individual and society, neighbouring property, and where required, environment or directly exposed property, in the case of fire. Construction Products Directive 89/106/EEC gives the following essential requirement for the limitation of fire risks: “The construction works must be designed and build in such a
