National Structural Steelwork Specification for …

1 NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 1 Apartfromanyfairdealingforthepurposesofr esearchorprivatestudyorcriticismorreview ,aspermittedundertheCopyrightDesignandPa tentsAct1988,thispublicationmaynotberepr oduced,storedortransmittedinanyformbyany meanswithoutthepriorpermissionofthepubli shersorinthecaseofreprographicreproducti ononlyinaccordancewiththetermsofthelicen cesissuedbythe UK Copyright LicensingAgency, or in accordance with the terms of licences issued by , ,tothebestofourknowledge,thatalldataandi nformationcontainedhereinareaccuratetoth eextentthattheyrelatetoeithermattersoffa ctoracceptedpractice or matters of opinion at the time of publication, The British Constructional 52/10 FirstEditionMarch1989 SecondEditionOctober1991 ThirdEditionJuly1994 SecondImpression March1998 FourthEditionMay2002 FifthEditionJanuary2007 CEMarkingVersion October2010 ISBN10:1-85073-062-8 ISBN13:978-1-85073-062-0 BritishLibraryCataloguing-in-Publication DataAcataloguerecordforthisbookisavailab lefromtheBritishLibrary NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 34 FOREWORDTheNationalStructuralSteelworkSp ecificationforBuildingConstructionispres entedhereinits5thEditionCEMarkingVersion .

2 Specification continues to meet its objective of achieving greater uniformity in steelworkcontract specifications and is recognised as a document that can be incorporated readily ,ontime, ; , and the Steel construction Institute take a most active part in the preparation of , ;tablesforweldinspectionandacceptancecri teria,suitableformostweldinggenerallyuse dinsteelworkbuildingconstruction,areplac edinanannex to the Specification . In Section 5 note is made that the Engineer should check that anyadditional project-specific requirements for non-destructive testing of welds are defined in (issuedwithBS,BSEN,BSENISOorBSISO references) (DesignandManagement) is drawn to Section 11 which requires that Steelwork Contractors should have all thenecessary facilities, skills and effective quality management to ensure that their services NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page observations, particularly on inaccuracies and ambiguities, or proposals on the clauses issue of the Specification has been prepared under the guidance of a steering committeecomposedoftherepresentativesand organisationslistedbelow.

3 MrAPillinger(Chairman) - BakkalaConsultingEngineersMrMBanfi- ArupMrDBrown- SteelConstructionInstituteMrGCharalambou s- TataSteelMrJGarner- ConsultantMrJKrancioch- JacobsMrDMcNelis- TataSteelDrRPope(Compiler) - BCSAT echnicalConsultantMrRReed- ConsultantMrAShepherd- DepartmentofCommunitiesandLocalGovernmen tThesteeringcommitteeacknowledgefurthera dviceprovidedby:MrJFrench- SandbergsMrGMathers- TheWeldingInstituteMrJCarmichael- TheWeldingInstituteDrRPargeter- TheWeldingInstituteF093 NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 56 Carehasbeentakentoobtaintheviewsandcomme ntsofallsectionsoftheindustryincludingcl ients, government bodies, architects, surveyors, consulting engineers, general contractors,steelworkcontractorsandcompo nentsuppliers. :(a) British,European,AmericanandISOS tandardsBritishStandardsInstitution389 ChiswickHighRoadLondonW44AL(b)TheConstru ction(DesignandManagementRegulations)[L1 44]andGuidanceNotestoEnvironmentalProtec tionAct1990[PG6/23]HerMajesty'sStationer yOffice(HMSO)oritsapprovedagents(c) (d) Newpaintsystemsfortheprotectionofconstru ctionsteelworkCIRIAC lassicHouse174-180 OldStreetLondonEC1V9BP(e)NationalStructu ralConcreteSpecificationCONSTRUCTR iversideHouse4 MeadowsBusinessParkCamberleySurreyGU179 ABCommentaryontheNationalStructuralSteel workSpecificationThe Commentary on the National Structural Steelwork Specification for building construction NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12.

4 24 PM Page 6 NationalStructuralSteelworkSpecification -5thEditionCEMarkingVersion7 CONTENTSSCOPE10 DEFINITIONS11 SECTION1 INFORMATIONREQUIREDBYTHESTEELWORKCONTRAC TOR Design-Checklist(SteelworkContractordesi gningconnections) Design-Checklist(SteelworkContractordesi gningmembers) Design-Checklist(SteelworkContractorarra nginglayout) Programme-Checklist17 SECTION2 SubstitutionofMaterialorForm27 SECTION3 INFORMATIONPROVIDEDBYTHESTEELWORKCONTRAC TOR "AsErected"Structure33F093 NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 7 Contents8 SECTION4 WORKMANSHIP Storage38 SECTION5 WORKMANSHIP ShearStudWelding44 SECTION6 WORKMANSHIP Fit-upifusingPreloadedBoltAssemblies50 SECTION7 WORKMANSHIP PermittedDeviationsforLatticeComponents6 0 SECTION8 WORKMANSHIP CertificationofCompletion64F093 NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12.

5 24 PM Page 8 NationalStructuralSteelworkSpecification -5thEditionCEMarkingVersion9 SECTION9 WORKMANSHIP PermittedDeviationsforFoundations,Wallsa ndFoundationBolts PermittedDeviationsofErectedComponents68 SECTION10 CoatingofSurfacestobeEncasedinConcrete78 SECTION11 Records81 ANNEXA WELDTESTING HOLDTIMES82 ANNEXB WELDS EXTENTOFROUTINESUPPLEMENTARYNDT83 ANNEXC WELDS ACCEPTANCEREQUIREMENTSANDMEASUREMENTDEFI NITIONS84 ANNEXD GUIDELINESFORVISUALINSPECTIONOFWELDS87 ANNEXE SPECIFICATIONSFORAPPLIEDCOATINGS88F093 NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 9 Scope10 SCOPEThisSpecificationdealswithstructura lsteelworkdesignedinaccordancewith:BS595 0-1 Structuraluseofsteelworkinbuildings:Code ofpracticefordesign:rolledandweldedsecti onsBSEN1993-1-1 Eurocode3:Designofsteelstructures :GeneralrulesandrulesforbuildingsBSEN199 3-1-8 Eurocode3:Designofsteelstructures :DesignofjointsBSEN1993-1-10 Eurocode 3: Design of steel structures Part : Materialtoughnessandthrough-thicknesspro pertiesThisSpecificationdealswithstructu ralsteelworkexecutedinaccordancewith:BSE N1090-1 Execution of steel structures and aluminimum structures Part 1:Requirementsforconformityassessmentofs tructuralcomponentsBSEN1090-2 Execution of steel structures and aluminimum structures Part 2:Technicalrequirementsforsteelstructure sIt can be used for all types of building construction designed for static loading.

6 It is based ,andalsocoversmaterials, preparation of drawings, fabrication, erection and the requirements for requirements are placed on the Steelwork Contractor and the Employer. Otherrequirements are allocated to the Engineer, who may not be directly a party to the steelworkcontract, , modifications that may be required to the National Structural Steelwork Specification by NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 10 NationalStructuralSteelworkSpecification -5thEditionCEMarkingVersion11 DEFINITIONST erms which are defined in this section are treated as Proper Nouns throughout the text of theSpecification. Thefollowingdefinitionsapplyforthepurpos esofthisSpecification:ConnectionDesign: Thedesignofbolts,welds,cleats, : : TheEmployer's,ortheSteelworkContractor's ,designerwhoisresponsible for the Structural design and for reviewing : Fullydimensioneddrawingsorelectronicequi valentpreparedbytheEngineershowingallmem berswiththeirsizeandmaterialgrades, the forces to be developed in their connections, anycambers,eccentricities(offsetsorlevel s)andotherinformationnecessaryforthedesi gnoftheconnectionsandcompletionofFabrica tionandErectionDrawings( ).

7 ElectronicData: Computer data and similar data transferred between partiesproviding essentially equivalent information to : The individual, or company, placing the contract with : This will usually be the main contractor, and is : Drawings, prepared if necessary by the Steelwork Contractor,showingdetailstoamplifytheinf ormationgivenintheSteelworkContractor'se rectionmethodstatementandshowingdetailso fanytemporarysteelwork( ).Examiner,ExaminingBody : A person or organisation respectively competent to : These responsibilities are distinct from those of : Electronic means of communication for automatic orsemi : Drawings or electronic equivalent prepared by the SteelworkContractor, showing all necessary information required :Theseareoftentermed detaildrawings .Fittings: Plates, flats or rolled sections which are welded or bolted : Drawings,preparedbytheSteelworkContracto rortheEngineer,indicating location of column bases and details of : Drawings,preparedbytheSteelworkContracto r,showingplans,crosssectionsandelevation s, : NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page 11 Definitions12 Note: Generally, the scope of an Inspection Authority sresponsibilitywouldnecessitateitbeingco mpetenttoverifythatweldingprocedurequali ficationrecordsaresuitablefortheworkbein g undertaken and that suitable welding : : Aplateusedfortestingpurposes,whichismade ofthesamematerial and using the same procedures as the joint in : TheprogrammeofdatesgivenintheProjectSpec ification,oragreed with the Steelwork Contractor, for.

8 The release of allnecessary information for the progress of The Works; thepreparation,submissionandacceptanceof fabricationdrawings,calculations and information; the intended starting : Aspecificationpreparedforaspecificbuildi ngproject(see"TheWorks") which includes the latest version of the NationalStructural Steelwork Specification and qualifies it wherenecessary. The Project Specification includes the executionspecification defined in BS EN 1090-2 and the : Activities concerned with the provision of systems, : : Asteelcomponent,generallyaplate, : Thecompanyappointedtofabricateand/orerec tthestructuralsteelwork. IfrequiredbytheProjectSpecification,theS teelworkContractormayalsoberesponsiblefo rdesign. ,the: : Aweld,otherthanabuttoredgeweld, : Aweldbetweenelementswhichmaybein-line,in theformofatee, : A weld formed using a technique which ensures a : This is distinct from incomplete penetration which : NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page : Greater detail is set out in the BCSA/ACE joint publication Allocation Project Specification shall state that the National Structural SteelworkSpecification for building construction 5th Edition CE Marking Version there is a conflict in specified requirements the Project Specification PROPOSEDWORKS CHECKLISTI nformationrequiredbytheSteelworkContract or(i) Abriefdescriptionofthestructure.

9 (ii) Theintendedpurposeofthestructure.(iii) DetailsoftheSitewithinwhichtheWorkswillb econstructed.(iv) ThebuildingclassinaccordancewiththeBuild ingRegulations.(v) Thosepartsofthestructure(ifany)thatareex ternal.(vi) Thosepartsofthestructure(ifany) NSSS 5 CE Version:D453 NSSS 5 v2 FINAL 11/8/10 12:24 PM Page DESIGN (i) Astatementdescribingthedesignconcept.(ii ) DesignDrawingsshowingalldimensionsreleva nttothesteelworkor,ifagreed,equivalentel ectronicdata.(iii) Thedesignstandardstobeusedforconnectiond esign.(iv) Informationnecessarytodesigntheconnectio nsincludingforces,momentsandtheircombina tionrequiredtobetransmittedateachjoint. Ifconnectiondesignis to be in accordance with BS 5950-1 or BS EN 1993-1-8, the forces andmomentsshouldbethefactoredvaluesasdef inedbythecode.(v) Particulars of any aesthetic, Structural or clearance limits to be observed orenvironmentalconditionswhichmayaffectd etailingorprotectivetreatment.

10 (vi) Detailsandlocationsofanytemporaryworksas sumedbytheEngineerinthedesign.(vii) Ascheduleofdrawings,calculationsandother informationwhichtheSteelworkContractormu stsubmitforacceptance.(viii) ( ).(ix) (x) Thedesignationofthesteeltobeusedincludin gthestandardnumber,materialgrade,impactq ualityandanythrough-thicknessrequirement s( ).(xi) Positionsonthestructurewhereadditionsand stiffenersarerequir