BS_EN_1090-2-2008_钢结构和铝结构的施工．钢结构的执行用技术要求.pdf

BS EN 1090-22008 ICS 91.080.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD cution of steel structures and aluminium structures Part 2 Technical requirements for the cution of steel structures 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 1090-22008 1 December National Foreword This British Standard is the UK implementation of BS EN 1090-22008. It supersedes DD ENV 1090-11998 DD ENV 1090-42001, DD ENV 1090-62001 which are withdrawn, and BS 5400- 61999, BS 5950-22001 which will be withdrawn on March 2010. The UK participation in its preparation was entrusted to Technical Committee B/521 cution 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 ination BSI, as a member of CEN, is obliged to publish EN 1090-22008 as a British Standard. 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 cution classes and weld 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 suggestions that should avoid these risks. This standard gives the technical requirements for the cution fabrication and erection of steel structures and is a supporting standard for the harmonized standard BS EN 1090-1, cution of steel structures and aluminium structures – Part 1 Requirements for conity assessment of structural components. Conity 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 quality management which are defined by reference to BS EN 1090-2. , BS EN 1090-22008 This standard supersedes several existing standards and hence has a very wide scope. Therefore, it requires specifiers to make a series of project- or application-specific decisions before cution commences on each part of the works. Annex A itemizes the additional and optional ination required. cution classes This standard introduces the concept of cution class EXC as a classified set of requirements specified for the cution 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 cution class. It is a design decision for the specifier to select the cution class 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 inative guidance on the factors that might be relevant to that decision. The primary reason to differentiate is to provide a level of reliability against failure or malfunction of the structure/component/detail that is matched to the consequences see BS EN 1990, Eurocode – Basis of structural design, for further ination. Hence, cution class is widely used in this standard as a reliability differentiator for providing choice of quality, testing and 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 cution class should also depend on the ‘service category’ SC that characterizes a component in terms of the circumstances of its designed use, and the ‘production category’ PC that characterizes a component in terms of the s used for its cution. These latter two types of category imply that, for a given structure/component/detail, the cution class specified should be increased in line 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, 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 because 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 knowledge 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 cution with respect to fatigue classes FAT classes, and PD 6705-2, Recommendations for the cution 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 Standards that are superseded by BS EN 1090-2. BS EN 1090-22008 BS EN 1090-2 relates the cution classes to weld quality levels in BS EN ISO 5817, Welding – Fusion-welded joints in steel, nickel, 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. These levels may generally be appropriate to establish, prequalify and certificate the routine quality level of the manufacturer’s 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 achievable 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 manufacturer’s welders and welding procedures are qualified. Thus, if a quality level of B or higher is required, it is more practical to specify this for each relevant joint detail and not for routine production, using the acceptance criteria given in PD 6705-2 for uating 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 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 conity assessment 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 cution specification. Functional tolerances are defined for two classes, of which the less onerous tolerance class 1 is the default specification for routine cution. 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 welded 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 determining 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 provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 1090-22008 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1090-2 July 2008 ICS 91.080.10Supersedes ENV 1090-11996, ENV 1090-21998, ENV 1090-31997, ENV 1090-41997, ENV 1090-51998, ENV 1090-62000 English Version cution of steel structures and aluminium structures - Part 2 Technical requirements for steel structures 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 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 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 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, Netherlands, 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 any and by any means reserved worldwide for CEN national Members. Ref. No. EN 1090-22008 E BS EN 1090-22008 EN 1090-22008 E 2 Contents Page Foreword..............................................................................................................................................................9 Introduction.......................................................................................................................................................10 1 Scope....................................................................................................................................................11 2 Normative references..........................................................................................................................12 2.1 General..................................................................................................................................................12 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 bearings..............................................................................................................................17 2.3 Preparation...........................................................................................................................................17 2.4 Welding.................................................................................................................................................18 2.5 Testing..................................................................................................................................................19 2.6 Erection.................................................................................................................................................19 2.7 Corrosion protection...........................................................................................................................20 2.8 Tolerances............................................................................................................................................20 2.9 Miscellaneous ......................................................................................................................................20 3 Terms and definitions .........................................................................................................................21 4 Specifications and documentation....................................................................................................23 4.1 cution Specification......................................................................................................................23 4.1.1 General..................................................................................................................................................23 4.1.2 cution classes................................................................................................................................23 4.1.3 Preparation grades..............................................................................................................................24 4.1.4 Geometrical tolerances.......................................................................................................................24 4.2 Constructors documentation ....................................