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NAtoBSEN1991-1-6:2005UKNationalAnnextoEurocode1:Actionsonstructures–Part1-6:Generalactions–ActionsduringexecutionICS91.010.30NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWNATIONALANNEXLicensedcopy:PONTYPRIDDCOLLEGE,24/05/2008,UncontrolledCopy,©BSIPublishingandcopyrightinformationTheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.©BSI2008ISBN9780580608155ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceB/525Draftforcomment07/30163355/DCPublicationhistoryFirstpublishedMay2008AmendmentsissuedsincepublicationAmd.no.DateTextaffectedNAtoBSEN1991-1-6:2005Licensedcopy:PONTYPRIDDCOLLEGE,24/05/2008,UncontrolledCopy,©BSI©BSI2008•1NAtoBSEN1991-1-6:2005NationalAnnex(informative)toBSEN1991-1-6:2005,Eurocode1:Actionsonstructures–Part1-6:Generalactions–ActionsduringexecutionIntroductionThisNationalAnnexhasbeenpreparedbyBSISubcommitteeB/525/1,Actions(loadings)andbasisofdesign.ItistobeusedinconjunctionwithBSEN1991-1-6:2005.NA.1ScopeThisNationalAnnexgives:a)theUKdecisionsfortheNationallyDeterminedParametersdescribedinthefollowingsubclausesofBSEN1991-1-6:2005:1.1(3)2.2(4)Note1*3.1(1)P3.1(5)Notes1and23.1(7)3.1(8)Note13.3(2)3.3(6)4.9(6)Note24.10(1)P4.11.1(2)Table4.1**4.11.2(1)Note24.12(1)PNote24.12(2)4.12(3)4.13(2)AnnexA,A1.1(1)Note2AnnexA,A1.3(2)AnnexA,A2.3(1)Note1AnnexA,A2.4(2)AnnexA,A2.4(3)AnnexA,A2.5(2)AnnexA,A2.5(3)Note1*Not2(4)asinBSEN1991-1-6:2005**Not4.11.1(1)Table4.1asinBSEN1991-1-6:2005Licensedcopy:PONTYPRIDDCOLLEGE,24/05/2008,UncontrolledCopy,©BSINAtoBSEN1991-1-6:20052•©BSI2008b)thedecisionsonthestatusofBSEN1991-1-6:2005informativeAnnexB(seeNA.3);c)referencestonon-contradictorycomplementaryinformation(seeNA.4).NA.2NationallydeterminedparametersNA.2.1Designrulesforauxiliaryconstructionworks[seeBSEN1991-1-6:2005,1.1(3)]UsetherecommendeddesignrulesinBSEN12810,BSEN12811,BSEN12812andTG20:(05)[1],asappropriateanddefinefortheindividualproject.NA.2.2Positioningofconstructionloadsclassifiedas“free”[seeBSEN1991-1-6:2005,2.2(4)Note1]Thelimitsofmovementforconstructionloadsclassifiedas“free”shouldbedefinedfortheindividualproject.NA.2.3Designsituationscorrespondingtowindactionsduringstormconditions[seeBSEN1991-1-6:2005,3.1(1)P]UsetherecommendeddesignsituationsforwindactionsduringstormconditionsandtheBCSAPublicationNo.39/05Guidetosteelerectioninwindyconditions[2].NA.2.4Returnperiodsforthedeterminationofthecharacteristicvaluesofvariableactionsduringexecution[seeBSEN1991-1-6:2005,3.1(5)Note1]Thevaluesshouldbedefinedfortheindividualproject,usingtherecommendedvaluesasaminimum.NA.2.5Minimumwindspeedduringexecution[seeBSEN1991-1-6:2005,3.1(5)Note2]Therecommendedvalueshouldbedefinedfortheindividualproject.NA.2.6Rulesforthecombinationofsnowloadsandwindactionswithconstructionloads[seeBSEN1991-1-6:2005,3.1(7)]Rulesforcombinationshouldbedefinedfortheindividualproject.Licensedcopy:PONTYPRIDDCOLLEGE,24/05/2008,UncontrolledCopy,©BSI©BSI2008•3NAtoBSEN1991-1-6:2005NA.2.7Rulesconcerningimperfectionsinthegeometryofthestructure[seeBSEN1991-1-6:2005,3.1(8)Note1]Theimperfectionsshouldbedefinedfortheindividualproject.NA.2.8Criteriaassociatedwithserviceabilitylimitstatesduringexecution[seeBSEN1991-1-6:2005,3.3(2)]Thecriteriaassociatedwithserviceabilitylimitstatesshouldbedefinedfortheindividualproject.NA.2.9Serviceabilityrequirementsforauxiliaryconstructionworks[seeBSEN1991-1-6:2005,3.3(6)]Therecommendedrulesandvaluesmaybeappropriate;however,theyshouldbedefinedfortheindividualproject.SeealsoBSEN12810,BSEN12811,BSEN12812,BSEN12813andrelatedcodessuchasTG20:(05)[1].NA.2.10Actionsduetoice,includingfloatingice[seeBSEN1991-1-6:2005,4.9(6)Note2]Theloadsandwaterlevelsshouldbedefinedfortheindividualproject.NA.2.11Actionsduetoatmosphericicing[seeBSEN1991-1-6:2005,4.10(1)P]Therepresentativevaluesoftheseactionsshouldbedefinedfortheindividualproject.GuidancemaybefoundinBSEN1993-1-3andinISO12494.NA.2.12RecommendedcharacteristicvaluesofconstructionloadsQcaandQcb[seeBSEN1991-1-6:2005,4.11.1(2)(Table4.1)]Qca–Thecharacteristicvalueqca,koftheuniformlydistributedloadmaybedefinedfortheindividualprojectandaminimumvalueof1.00isrecommended.Qcb–Thecharacteristicvaluesmaybedefinedfortheindividualproject.Therecommendedminimumvaluesshouldbeusedforbridges.Forotherapplicationsusetherecommendedrules.Licensedcopy:PONTYPRIDDCOLLEGE,24/05/2008,UncontrolledCopy,©BSINAtoBSEN1991-1-6:20054•©BSI2008NA.2.13Constructionloadsduringthecastingofconcrete[seeBSEN1991-1-6:2005,4.11.2(1)Note2]Thefollowingrecommendedminimumvaluesshouldbeusedfor:Qca:qca,k=0.75kN/m2asgiveninTable4.2Qcc:qcc,k=0.5kN/m2giveninTable4.1.AlternativevaluesforQcaandQccmaybedeterminedfortheindividualprojectifaspecificassessmentisundertaken.ValuesforQcfshouldbeassessedanddeterminedfortheindividualprojecttakingaccountoftheinformationprovidedinTable4.1and4.11.2.NA.2.14Dynamiceffectsduetoaccidentalactions[seeBSEN1991-1-6:2005,4.12(1)PNote2]Valuesshouldbespecifiedfortheindividualproject.Therecommendedrulesandvaluesshouldbeusedfordetermination,althoughthegivenvalueof2m