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1、BS EN 1090-2:2008 ICS 91.080.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Execution of steel structures and aluminium structures Part 2: Technical requirements for the execution of steel structures Licensed Copy: London South Bank University, South Bank
2、University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3 2008 BSI 2008 ISBN 978 0 580 55315 8 Amendments/corrigenda issued since publication DateComments BS EN 1090-2:2008 1 December National
3、Foreword This British Standard is the UK implementation of BS EN 1090-2:2008. It supersedes DD ENV 1090-1:1998 DD ENV 1090-4:2001, DD ENV 1090-6:2001 which are withdrawn, and BS 5400- 6:1999, BS 5950-2:2001 which will be withdrawn on March 2010. The UK participation in its preparation was entrusted
4、to Technical Committee B/521 Execution of steel structures, with the assistance of B/525/10 Bridges. A list of organizations represented on this committee can be obtained on request to its secretary. Additional information BSI, as a member of CEN, is obliged to publish EN 1090-2:2008 as a British St
5、andard. However, attention is drawn to the fact that during the development of this European Standard, the UK committee voted against its approval as a European Standard. The reason for the UK committee vote was because of concerns about possible misspecification in terms of execution classes and we
6、ld quality levels in particular. If realized, these concerns about the range and the basis of some of the choices could lead either to under-specification and inadequate safety or to over-specification and possible barriers to trade. These issues are described more fully below, together with suggest
7、ions that should avoid these risks. This standard gives the technical requirements for the execution (fabrication and erection) of steel structures and is a supporting standard for the harmonized standard BS EN 1090-1, Execution of steel structures and aluminium structures Part 1: Requirements for c
8、onformity assessment of structural components. Conformity assessment to BS EN 1090-1 requires that the manufacturer operates a certified factory production control system. The quality management requirements for factory production control include, for instance, levels of traceability and welding qua
9、lity management which are defined by reference to BS EN 1090-2. , Licensed Copy: London South Bank University, South Bank University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI BS EN 1090-2:2008 This standard supersedes several existing standards and hence has a very wide scope. Therefore, it requ
10、ires specifiers to make a series of project- or application-specific decisions before execution commences on each part of the works. Annex A itemizes the additional and optional information required. Execution classes This standard introduces the concept of execution class (EXC) as a classified set
11、of requirements specified for the execution of the works as a whole, of an individual component, or of a detail of a component. Annex A.3 itemizes those requirements in the standard which depend on the choice of execution class. It is a design decision for the specifier to select the execution class
12、 required for the works as a whole, an individual component, or a particular detail of a component. Annex B of BS EN 1090-2 provides some informative guidance on the factors that might be relevant to that decision. The primary reason to differentiate is to provide a level of reliability against fail
13、ure or malfunction of the structure/component/detail that is matched to the consequences (see BS EN 1990, Eurocode Basis of structural design, for further information). Hence, execution class is widely used in this standard as a reliability differentiator for providing choice of quality, testing and
14、 qualification requirements, although the relationship between this new differentiator and those recommended by BS EN 1990 is not fully defined. Annex B of BS EN 1090-2 recommends that the choice of execution class should also depend on the service category (SC) that characterizes a component in ter
15、ms of the circumstances of its designed use, and the production category (PC) that characterizes a component in terms of the methods used for its execution. These latter two types of category imply that, for a given structure/component/detail, the execution class specified should be increased in lin
16、e with more onerous demands in service and/or if it is more difficult to produce. From Annex B it appears likely that most steel structures in the UK will include components in both PC1 and PC2, but most will be SC1 unless they are designed for fatigue actions (in which case they will be SC2). Thus,
17、 as a default basis, EXC2 could be specified for structures/components/details used in buildings, and EXC3 could be specified for structures/components/details used in bridges. Weld quality levels For structures/components/details designed for fatigue additional requirements should be adopted becaus
18、e the simple choice between design for quasi-static (SC1) and fatigue (SC2) applications does not sufficiently discriminate the required weld quality levels in terms of fatigue classes. In these circumstances, as the choice of appropriate requirements requires a level of design and construction know
19、ledge that many potential users of this standard may not possess, reference should be made to the advice given in PD 6695-1-9, Recommendations for the design of structures to BS EN 1993-1-9, which explains the relationship between design and execution with respect to fatigue classes (FAT classes), a
20、nd PD 6705-2, Recommendations for the execution of steel bridges to BS EN 1090-2, which gives acceptance criteria for welds designed for fatigue. These acceptance criteria have been developed for structural welds on a fitness-for-purpose basis and are consistent with those used in the British Standa
21、rds that are superseded by BS EN 1090-2. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI BS EN 1090-2:2008 BS EN 1090-2 relates the execution classes to weld quality levels in BS EN ISO 5817, Welding Fusion-welded joints in steel, nick
22、el, titanium and their alloys (beam welding excluded) Quality levels for imperfections, as follows: EXC1: Quality level D; EXC2: Quality level C generally; EXC3: Quality level B (i.e. as required for welder qualification tests and welding procedure qualification records); EXC4: Quality level B+. The
23、se levels may generally be appropriate to establish, prequalify and certificate the routine quality level of the manufacturers welding operations. However, although EXC4 can be used to specify the extent of supplementary non-destructive testing, the associated quality level B+ is not practically ach
24、ievable in routine production as it requires the manufacturer to demonstrate a capability of meeting a quality level which is more stringent than that for which the manufacturers welders and welding procedures are qualified. Thus, if a quality level of B or higher is required, it is more practical t
25、o specify this for each relevant joint detail and not for routine production, using the acceptance criteria given in PD 6705-2 for evaluating imperfections on an individual basis, as permitted by BS EN 1090-2. Tolerances BS EN 1090-2 is more complicated than the British Standards that it supersedes
26、in its approach to specifying permitted geometrical deviations as systems of tolerances. Three types of geometrical tolerance are defined: 1. essential tolerances that are essential for the mechanical resistance and stability of the completed structure and which are used to support conformity assess
27、ment to BS EN 1090-1; 2. functional tolerances required to fulfil other criteria such as fit-up and appearance; 3. special tolerances that may be specified for project-specific reasons, and which would need to be clearly defined in the execution specification. Functional tolerances are defined for t
28、wo classes, of which the less onerous tolerance class 1 is the default specification for routine execution. Tolerance class 2 is likely to require special and more expensive measures in fabrication and erection. As an alternative, the standard allows BS EN ISO 13920, Welding General tolerances for w
29、elded constructions Dimensions for lengths and angles Shape and position, to be used as the basis for specifying functional tolerances. BS EN ISO 13920 is suitable for those weldments and more heavily welded structural components where potential distortion from welding is the dominant factor in dete
30、rmining the dimensions and shape of the completed component and its fit-up to other components. BS EN 1090-2 selects the class relevant to the function of structural components from the four tolerance classes defined in BS EN ISO 13920. This publication does not purport to include all the necessary
31、provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI BS EN 1090-2:2008 EUROPEAN S
32、TANDARD NORME EUROPENNE EUROPISCHE NORM EN 1090-2 July 2008 ICS 91.080.10Supersedes ENV 1090-1:1996, ENV 1090-2:1998, ENV 1090-3:1997, ENV 1090-4:1997, ENV 1090-5:1998, ENV 1090-6:2000 English Version Execution of steel structures and aluminium structures - Part 2: Technical requirements for steel s
33、tructures Excution des structures en acier et des structures en aluminium - Partie 2: Exigences techniques pour les structures en acier Ausfhrung von Stahltragwerken und Aluminiumtragwerken - Teil 2: Technische Regeln fr die Ausfhrung von Stahltragwerken This European Standard was approved by CEN on
34、 11 April 2008. 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
35、be obtained on application to the CEN Management Centre 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 CEN
36、 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherland
37、s, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CENAll rights of exploitation in a
38、ny form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1090-2:2008: E Licensed Copy: London South Bank University, South Bank University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI BS EN 1090-2:2008 EN 1090-2:2008 (E) 2 Contents Page Foreword9 Introduction.10 1 Scope11 2
39、 Normative references12 2.1 General12 2.2 Constituent products 12 2.2.1 Steels 12 2.2.2 Steel castings.14 2.2.3 Welding consumables.14 2.2.4 Mechanical fasteners 15 2.2.5 High strength cables .16 2.2.6 Structural bearings17 2.3 Preparation.17 2.4 Welding.18 2.5 Testing19 2.6 Erection.19 2.7 Corrosio
40、n protection.20 2.8 Tolerances20 2.9 Miscellaneous 20 3 Terms and definitions .21 4 Specifications and documentation23 4.1 Execution Specification23 4.1.1 General23 4.1.2 Execution classes23 4.1.3 Preparation grades24 4.1.4 Geometrical tolerances.24 4.2 Constructors documentation 24 4.2.1 Quality do
41、cumentation24 4.2.2 Quality plan 24 4.2.3 Safety of the erection works.25 4.2.4 Execution documentation.25 5 Constituent products 25 5.1 General25 5.2 Identification, inspection documents and traceability 25 5.3 Structural steel products26 5.3.1 General26 5.3.2 Thickness tolerances28 5.3.3 Surface c
42、onditions 28 5.3.4 Special properties29 5.4 Steel castings.29 5.5 Welding consumables.29 5.6 Mechanical fasteners 31 5.6.1 General31 5.6.2 Terminology .31 5.6.3 Structural bolting assemblies for non preloaded applications 31 5.6.4 Structural bolting assemblies for preloading.31 5.6.5 Direct tension
43、indicators.32 5.6.6 Weather resistant assemblies32 5.6.7 Foundation bolts32 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI BS EN 1090-2:2008 EN 1090-2:2008 (E) 3 5.6.8 Locking devices.32 5.6.9 Taper washers .32 5.6.10 Hot rivets32 5.6
44、.11 Fasteners for thin gauge components33 5.6.12 Special fasteners.33 5.6.13 Delivery and identification33 5.7 Studs and shear connectors33 5.8 Grouting materials.34 5.9 Expansion joints for bridges34 5.10 High strength cables, rods and terminations.34 5.11 Structural bearings34 6 Preparation and as
45、sembly34 6.1 General .34 6.2 Identification 35 6.3 Handling and storage35 6.4 Cutting37 6.4.1 General .37 6.4.2 Shearing and nibbling.37 6.4.3 Thermal cutting37 6.4.4 Hardness of free edge surfaces.38 6.5 Shaping 38 6.5.1 General .38 6.5.2 Hot forming 39 6.5.3 Flame straightening 39 6.5.4 Cold formi
46、ng 39 6.6 Holing41 6.6.1 Dimensions of holes .41 6.6.2 Tolerances on hole diameter for bolts and pins 42 6.6.3 Execution of holing.42 6.7 Cut outs43 6.8 Full contact bearing surfaces 44 6.9 Assembly44 6.10 Assembly check 45 7 Welding.45 7.1 General .45 7.2 Welding plan 45 7.2.1 Requirements for a we
47、lding plan.45 7.2.2 Content of a welding plan.45 7.3 Welding processes46 7.4 Qualification of welding procedures and welding personnel.47 7.4.1 Qualification of welding procedures.47 7.4.2 Welders and welding operators.49 7.4.3 Welding coordination49 7.5 Preparation and execution of welding 51 7.5.1
48、 Joint preparation.51 7.5.2 Storage and handling of welding consumables.52 7.5.3 Weather protection52 7.5.4 Assembly for welding .53 7.5.5 Preheating53 7.5.6 Temporary attachments53 7.5.7 Tack welds .53 7.5.8 Fillet welds .54 7.5.9 Butt welds 54 7.5.10 Welds on steels with improved atmospheric corro
49、sion resistance.55 7.5.11 Branch connections55 7.5.12 Stud welding55 7.5.13 Slot and plug welds.55 7.5.14 Spot welds for thin gauge components56 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 02:57, Uncontrolled Copy, (c) BSI BS EN 1090-2:2008 EN 1090-2:2008 (E) 4 7.5.15 Other weld types56 7.5.16 Post-weld heat treatment56 7.5.17 Execution of welding.56 7.5.18 Welding of bridge decks.57 7.6 Acceptance criteria57 7.7 Welding of stainless steels.58 7.7.1 Amendments to EN 1011-1 requirements .58 7.7.2 Amendments
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