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1、BRITISHSTANDARDBSEN1991-1-4:2005Eurocode1:Actionsonstructures—Part1-4:Generalactions—WindactionsTheEuropeanStandardEN1991-1-4:2005hasthestatusofaBritishStandardICS91.010.30
BSEN1991-1-4:2005NationalforewordThisBriti
2、shStandardistheofficialEnglishlanguageversionofEN1991-1-4:2005.ItsupersedesDDENV1991-1-4:2004whichiswithdrawn.DetailsofsupersededBritishStandardsaregiveninthetablebelow.ThestructuralEurocodesaredividedintopackagesbygroupingEurocodesforeachofthemainmaterials,concrete,steel,com
3、positeconcreteandsteel,timber,masonryandaluminium,thisistoenableacommondateofwithdrawal(DOW)foralltherelevantpartsthatareneededforaparticulardesign.Theconflictingnationalstandardswillbewithdrawnattheendofthecoexistenceperiod,afteralltheENEurocodesofapackageareavailable.Follow
4、ingpublicationoftheEN,thereisaperiodof2yearsallowedforthenationalcalibrationperiodduringwhichtheNationalannexisissued,followedbyathreeyearcoexistenceperiod.DuringthecoexistenceperiodMemberStateswillbeencouragedtoadapttheirnationalprovisionstowithdrawconflictingnationalrulesbe
5、foretheendofthecoexistentperiod.TheCommissioninconsultationwithMemberStatesisexpectedtoagreetheendofthecoexistenceperiodforeachpackageofEurocodes.Attheendofthecoexistenceperiod,thenationalstandard(s)willbewithdrawn.IntheUK,thefollowingnationalstandardsaresupersededbytheEuroco
6、de1series.Thesestandardswillbewithdrawnonadatetobeannounced.EurocodeSupersededBritishStandardsEN1991-1-1BS6399-1:1996EN1991-1-2noneEN1991-1-3BS6399-3:1988EN1991-1-4BS6399-2:1997,BS5400-2:1978*EN1991-1-5BS5400-2:1978*EN1991-1-6noneEN1991-1-7noneEN1991-2BS5400-1:1988,BS5400-2:1
7、978*EN1991-3noneEN1991-4none*BS5400-2:1978willnotbefullysupersededuntilpublicationofAnnexA.2toBSEN1990:2002.TheUKparticipationinitspreparationwasentrustedbyTechnicalCommitteeB/525,Buildingandcivilengineeringstructures,toSubcommitteeB/525/1,Actions(loadings)andbasisofdesign,wh
8、ichhastheresponsibilityto:—aidenquirerstounderstandthetext;ThisBriti
