1、NATIONAL ANNEXNA to BS EN 1992-1-2:2004UK National Annex to Eurocode 2: Design of concrete structures Part 1-2: General rules Structural fire designICS 13.220.50; 91.010.30; 91.080.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3
2、g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Tue Mar 07 02:22:30 GMT 2006, Uncontrolled Copy, (c) BSINA to BS EN 1992-1-2:2004This National Annex was published under the authority of the Standards Policy and Strategy Committee on 8 D
3、ecember 2005 BSI 8 December 2005First edition December 2005 The following BSI references relate to the work on this National Annex:Committee reference B/525/2Draft for comment 05/30134001ISBN 0 580 47245 0Committees responsible for this National AnnexThe preparation of this National Annex was entrus
4、ted by Committee B/525, Building and civil engineering structures, to B/525/2, Structral use of concrete, upon which the following bodies were represented:Association of Consulting EngineersBritish Cement AssociationBritish Precast Concrete Federation Ltd.Building Research EstablishmentConcrete Soci
5、etyDepartment of Transport (Highways Agency)Institution of Civil EngineersInstitution of Structural EngineersOffice of the Deputy Prime MinisterScottish Building Standards AgencyUK SteelCo-opted membersSummary of pagesThis document comprises a front cover, an inside front cover, pages 1 and 2, an in
6、side back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Tue Mar 07 02:22:30 GMT 2006, Uncontrolled Copy, (c) BSINA to BS EN 1992-1-2:2004 BSI
7、 8 December 20051National Annex (informative) to BS EN 1992-1-2:2004, Eurocode 2: Design of concrete structures Part 1-2: General rules Structural fire designIntroductionThis National Annex has been prepared by BSI Subcommittee B/525/2, Structural use of concrete. In the UK it is to be used in conju
8、nction with BS EN 1992-1-2:2004.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1992-1-1:2004; 2.1.3 (2) 5.3.2 (2) 2.3 (2)P 5.6.1 (1) 3.2.3 (5) 5.7.3 (2) 3.2.4 (2) 6.1 (5) 3.3.3 (1) 6.2 (2) 4.1 (1)P 6.3 (
9、1) 4.5.1 (2) 6.4.2.1 (3) 5.2 (3) 6.4.2.2 (2)b) the UK decisions on the status of BS EN 1992-1-2:2004 informative annexes;c) references to non-contradictory complementary information.NA.2 Nationally Determined ParametersUK decisions for the Nationally Determined Parameters described in BS EN 1992-1-2
10、:2004 are given in Table NA.1.NA.3 Decisions on the status of informative annexesBS EN 1992-1-2:2004 informative Annexes A, B, C, D and E may be used in the UK.NA.4 References to non-contradictory complementary informationThe tabular methods for the design of columns described in BS EN 1992-1-2:2004
11、, 5.3 are limited to braced structures. Guidance on unbraced structures is given in PD 6687:2005, Clause 4.BibliographyPD 6687:2005, Background paper to the UK National Annexes to BS EN 1992-1-1 and BS EN 1992-1-2.Licensed Copy: Wang Bin, na, Tue Mar 07 02:22:30 GMT 2006, Uncontrolled Copy, (c) BSIN
12、A to BS EN 1992-1-2:20042 BSI 8 December 2005TableNA.1 UKdecisions for Nationally Determined Paramters described inBS EN 1992-1-2:2004SubclauseNationallyDeterminedParameterEurocode recommendationUK decision2.1.3(2)Values of %1and %2%1= 200 K%2= 240 KUse the recommended values2.3(2)PPartial safetyfac
13、tor M,fi1,0 for both thermaland mechanicalpropertiesUse the recommended value3.2.3(5)Values for theparameters of the stress-strain relationship of reinforcingsteel at elevated temperaturesClass N (Table 3.2a)or Class X (Table 3.2b)Class N(Table 3.2a)3.2.4(2)Values for theparameters of the stress-str
14、ain relationship of cold worked (wires and strands) prestressingsteel atelevated temperaturesClass Aor Class Bin Table 3.3Class A3.3.3(1)Value of thermal conductivitycLimitsdefined in3.3.3(2)The lower limitdefinedin3.3.3(2)4.1(1)PUse ofadvancedcalculation methods tosatisfy 2.4.1(2)PNoneProperlyvalid
15、ated advancedcalculation methods may be used4.5.1(2)Value of moisture content k% below which spallingis unlikely to occur3 %Use the recommended value5.2(3)Reference loadlevelfi0,7Use the recommended value5.3.1(1)Tabulated data for unbraced structuresNoneNone5.3.2(2)Value of emax0,15h(or b)Use the re
16、commended value5.6.1(1)Web thicknessClass WA, WB or WCWA5.7.3(2)Additional rules on rotation capacity atsupports for continuoussolid slabsNoneNone6.1(5)Reduction ofstrengthatelevatedtemperature for high strength concretesFor C55/67andC60/75: Class 1ofTable 6.1NFor C70/85andC80/95: Class 2ofTable 6.1
17、NFor C90/105: Class 3 ofTable 6.1NThe recommended classes should be used.However, alternative values may beusedbut only ifsatisfactory test evidenceis available.6.2(2)Methods to control spallingof highstrength concretesMethodsA toDAny of the Methods A to D or a combination of the methods may be used
18、6.3(1)Value of thermal conductivityfor highstrength concreteLimitsgiven in 3.3.3(2)The upper limit defined in 3.3.3(2)6.4.2.1(3)Value of factork1,1 for Class 1 ofTable 6.1N1,3 for Class 2 ofTable 6.1NUse the recommended values6.4.2.2(2)Value of factorkmkmvaluesgiven in Table 6.2NUse the recommended
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