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1、NA to BS EN 1995-1-2:2004 UK National Annex to Eurocode 5: Design of timber structures Part 1-2: General Structural fire design ICS 13.220.50; 91.010.30; 91.080.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW NATIONAL ANNEX Licensed Copy: sheffieldun sheffieldun, na, Tue No
2、v 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006 ISBN 0 580 49350 4 The following BSI references relate to the work on this standard: Committee refer
3、ence B/525/5 Draft for comment 05/30134000 Publication history First edition, October 2006 Amendments issued since publication Amd. no.DateText affected NA to BS EN 1995-1-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 2006i NA t
4、o BS EN 1995-1-2:2004 Contents Introduction 1 NA.1Scope 1 NA.2Nationally Determined Parameters 1 NA.3Guidance on using informative annexes 2 NA.4Reference to non-contradictory complementary information 3 Bibliography 4 Summary of pages This document comprises a front cover, an inside front cover, pa
5、ges i and ii, pages 1 to 4, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI NA to BS EN 1995-1-2:2004 ii BSI 2006This page deliberately left blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07
6、09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 20061 NA to BS EN 1995-1-2:2004 National Annex NA (informative) to BS EN 1995-1-2:2004, Eurocode 5: Design of timber structures Part 1-2: General Structural fire design Introduction This National Annex has been prepared by BSI Subcommittee, B/5
7、25/5, Structural use of timber. In the UK it is to be used in conjunction with BS EN 1995-1-2 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 Scope This National Annex gives: a)the UK decisions for the Nati
8、onally Determined Parameters described in the following subclauses of BS EN 1995-1-2:2004: 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 Pa
9、rameters NA.2.1Maximum temperature rise for separating function in parametric fire exposure 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)maxi
10、mum temperature rise (2) of 240 K. NA.2.2Partial factor for material properties in fire BS EN 1995-1-2:2004, 2.3(1)P The partial factor for material properties in fire, M,fi, should be taken as 1,0. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c
11、) BSI NA to BS EN 1995-1-2:2004 2 BSI 2006 NA.2.3Partial factor for mechanical resistance of connections in a fire situation BS EN 1995-1-2:2004, 2.3(2)P The partial factor for mechanical resistance of connections in a fire situation, M,fi, should be taken as 1,0. NA.2.4Reduction factor fi for combi
12、nations of actions BS EN 1995-1-2:2004, 2.4.2(3) The reduction factor for combinations of actions, fi, should be evaluated using expression 2.9 of BS EN 1995-1-2, but is not permitted to have a value less than 0,4. NA.2.5Procedure for determining cross-sectional properties BS EN 1995-1-2:2004, 4.2.1
13、(1) The cross-sectional properties in fire should be determined using the reduced cross-section method of 4.2.2. NA.3 Guidance on using informative annexes NA.3.1Parametric fire exposure BS EN 1995-1-2:2004, Annex A BS EN 1995-1-2:2004, Annex A should not be used. NA.3.2Advanced calculation methods
14、BS EN 1995-1-2:2004, Annex B BS EN 1995-1-2:2004, Annex B should not be used. NA.3.3Load-bearing floor joists and wall studs in assemblies whose cavities are completely filled with insulation BS EN 1995-1-2:2004, Annex C BS EN 1995-1-2:2004, Annex C may be used. NA.3.4Charring of members in wall and
15、 floor assemblies with void cavities BS EN 1995-1-2:2004, Annex D BS EN 1995-1-2:2004, Annex D should not be used. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 20063 NA to BS EN 1995-1-2:2004 NA.3.5Analysis of the separating function
16、of wall and floor assemblies BS EN 1995-1-2:2004, Annex E BS EN 1995-1-2:2004, Annex E should not be used. NA.3.6Guidance for users of EN 1995-1-2 BS EN 1995-1-2:2004, Annex F BS EN 1995-1-2:2004, Annex F may be used. NA.4 Reference to non-contradictory complementary information Material from BS 526
17、8, Structural use of timber PD 6693, Complementary information for use with Eurocode 5, BSI, London. (Publication date to be announced.) Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI NA to BS EN 1995-1-2:2004 4 BSI 2006 Bibliography Standa
18、rds publications For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 5268, Structural use of timber PD 6693, Complementary information for use with Eurocode 5 BS EN 1990:2002, Eurocode Basi
19、s 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 Common rules and rules for buildings. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c)
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30、ons. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-. NA to BS EN 1995-1-2:2004 389 Chiswick High Road London W4 4AL Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 09:11:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI