1、NA to BS EN 1995-1-2:2004UK National Annex to Eurocode 5: Design of timber structures Part 1-2: General Structural fire designICS 13.220.50; 91.010.30; 91.080.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWNATIONAL ANNEXLicensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00
2、:00 2007, Uncontrolled Copy, (c) BSIPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 49350 4The following BSI references relate to the work on this standard:Committee reference B/525/5Draft for com
3、ment 05/30134000Publication historyFirst edition, October 2006Amendments issued since publicationAmd. no. Date Text affectedNA to BS EN 1995-1-2:2004Licensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2006 iNA to BS EN 1995-1-2:2004ContentsIntroduction 1NA
4、.1 Scope 1NA.2 Nationally Determined Parameters 1NA.3 Guidance on using informative annexes 2NA.4 Reference to non-contradictory complementary information 3Bibliography 4Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover a
5、nd a back cover.Licensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSINA to BS EN 1995-1-2:2004ii BSI 2006 This page deliberately left blankLicensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2006 1NA to BS EN 1995-1-2:
6、2004National Annex NA (informative) to BS EN 1995-1-2:2004, Eurocode 5: Design of timber structures Part 1-2: General Structural fire designIntroductionThis National Annex has been prepared by BSI Subcommittee, B/525/5, Structural use of timber. In the UK it is to be used in conjunction with BS EN 1
7、995-1-2 for the structural fire design of timber structures, together with BS EN 1995-1-1, BS EN 1990 and BS EN 1991 and their National Annexes.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1995-1-2:200
8、4: 2.1.3(2) 2.3(1)P 2.3(2)P 2.4.2(3) 4.2.1(1)b) the UK decisions on the status of BS EN 1995-1-2:2004 informative annexes;c) reference to non-contradictory complementary information.NA.2 Nationally Determined Parameters NA.2.1 Maximum temperature rise for separating function in parametric fire expos
9、ure BS EN 1995-1-2:2004, 2.1.3(2)During the decay phase the temperature rise of the unexposed side of a separating construction should be limited to the following:a) average temperature rise (1) of 200 K;b) maximum temperature rise (2) of 240 K.NA.2.2 Partial factor for material properties in fire B
10、S EN 1995-1-2:2004, 2.3(1)PThe partial factor for material properties in fire, M,fi, should be taken as 1,0.Licensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSINA to BS EN 1995-1-2:20042 BSI 2006NA.2.3 Partial factor for mechanical resistance of connections in
11、a fire situation BS EN 1995-1-2:2004, 2.3(2)PThe partial factor for mechanical resistance of connections in a fire situation, M,fi, should be taken as 1,0.NA.2.4 Reduction factor fifor combinations of actions BS EN 1995-1-2:2004, 2.4.2(3)The reduction factor for combinations of actions, fi, should b
12、e evaluated using expression 2.9 of BS EN 1995-1-2, but is not permitted to have a value less than 0,4.NA.2.5 Procedure for determining cross-sectional properties BS EN 1995-1-2:2004, 4.2.1(1)The cross-sectional properties in fire should be determined using the reduced cross-section method of 4.2.2.
13、NA.3 Guidance on using informative annexesNA.3.1 Parametric fire exposure BS EN 1995-1-2:2004, Annex ABS EN 1995-1-2:2004, Annex A should not be used.NA.3.2 Advanced calculation methods BS EN 1995-1-2:2004, Annex BBS EN 1995-1-2:2004, Annex B should not be used.NA.3.3 Load-bearing floor joists and w
14、all studs in assemblies whose cavities are completely filled with insulation BS EN 1995-1-2:2004, Annex CBS EN 1995-1-2:2004, Annex C may be used.NA.3.4 Charring of members in wall and floor assemblies with void cavities BS EN 1995-1-2:2004, Annex DBS EN 1995-1-2:2004, Annex D should not be used.Lic
15、ensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2006 3NA to BS EN 1995-1-2:2004NA.3.5 Analysis of the separating function of wall and floor assemblies BS EN 1995-1-2:2004, Annex EBS EN 1995-1-2:2004, Annex E should not be used.NA.3.6 Guidance for users of
16、 EN 1995-1-2 BS EN 1995-1-2:2004, Annex FBS EN 1995-1-2:2004, Annex F may be used.NA.4 Reference to non-contradictory complementary information Material from BS 5268, Structural use of timberPD 6693, Complementary information for use with Eurocode 5, BSI, London. (Publication date to be announced.)L
17、icensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSINA to BS EN 1995-1-2:20044 BSI 2006BibliographyStandards publicationsFor dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any am
18、endments) applies.BS 5268, Structural use of timberPD 6693, Complementary information for use with Eurocode 5BS EN 1990:2002, Eurocode Basis of structural design.BS EN 1991 (all parts), Eurocode 1 Actions on structures.BS EN 1995-1-1:2004, Eurocode 5 Design of timber structures Part 1-1: General Com
19、mon rules and rules for buildings.Licensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSIThis page deliberately left blankNA to BS EN 1995-1-2:2004Licensed Copy: Wang Bin, na, Fri Feb 02 07:18:45 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBSI British Standards Inst
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