NA-TO-BS-EN-1994-1-2-2005.pdf

NA to BS EN 1994-1-2:2005 UK National Annex to Eurocode 4: Design of composite steel and concrete structures Part 1-2: General rules Structural fire design ICS 13.220.50; 91.010.30; 91.080.10; 91.080.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW NATIONAL ANNEX Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. © BSI 2008 ISBN 978 0 580 54982 3 The following BSI references relate to the work on this standard: Committee reference B/525/4 Draft for comment 07/30128174 DC Publication history First published August 2008 Amendments issued since publication Amd. no.DateText affected NA to BS EN 1994-1-2:2005 Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI © BSI 20081 NA to BS EN 1994-1-2:2005 National Annex (informative) to BS EN 1994-1-2:2005, Eurocode 4: Design of composite steel and concrete structures Part 1.2: General rules Structural fire design Introduction This National Annex has been prepared by BSI Subcommittee B/525/4, Composite structures. In the UK it is to be used in conjunction with BS EN 1994-1-2. NA.1 Scope This National Annex gives: a)the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1994-1-2:2005. 1.1(16) 2.1.3(2) 2.3(1)P 2.3(2)P 2.4.2(3) 3.3.2(9) 4.1(1)P 4.3.5.1(10) b)the UK decisions on the status of BS EN 1994-1-2:2005 informative annexes; and c)references to non-contradictory complementary information. NA.2 Nationally Determined Parameters NA.2.1General UK decisions for the Nationally Determined Parameters described in BS EN 1994-1-2:2005 are given in NA.2.2 to NA.2.9. NA.2.2Concrete strength classes BS EN 1994-1-2:2005, 1.1(16) For strengths higher than C50/60 the recommendations given in BS EN 1992-1-2:2004, section 6 can be used. NA.2.3Parametric fire exposure BS EN 1994-1-2:2005, 2.1.3(2) Use the recommended values. Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI NA to BS EN 1994-1-2:2005 2© BSI 2008 NA.2.4Partial factors for the fire situation Mechanical properties, * *M,fi,a, * *M,fi,s, * *M,fi,c, * *M,fi,v BS EN 1994-1-2:2005, 2.3(1)P Use the recommended values. NA.2.5Partial factors for the fire situation Thermal properties, * *M,fi BS EN 1994-1-2:2005, 2.3(2)P Use the recommended values NA.2.6Member analysis and load reduction factors BS EN 1994-1-2:2005, 2.4.2(3) The partial factors for use with equations 2.4, 2.5a and 2.5b should be obtained from the National Annex to BS EN 1990:2002. NA.2.7Thermal conductivity of concrete, 2 2c BS EN 1994-1-2:2005, 3.3.2(9) Use the upper limit value as recommended in Note 2. NA.2.8Use of advanced calculation models BS EN 1994-1-2:2005, 4.1(1)P Advanced calculation models may be used. NA.2.9Buckling length of columns, Lei and Let BS EN 1994-1-2:2005, 4.3.5.1(10) The following values can be used: Lei = 0.70 Let = 0.85 NA.3 Decisions on the status of informative annexes BS EN 1994-1-2: 2005, Annexes A, B, C, E, F and G may be used. BS EN 1994-1-2: 2005, Annexes D, H and I should not be used. Alternative guidance is given in NA.4. NA.4 References to non-contradictory complementary information References to non-contradictory complementary information cited in this National Annex can be found at www.steel-ncci.co.uk1). 1) In preparation Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI © BSI 20083 NA to BS EN 1994-1-2:2005 Bibliography Standards publications For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS EN 1992-1-2:2004, Eurocode 2: Design of concrete structures Part 1-2: General rules Structural fire design National Annex to BS EN 1990:2002, UK National Annex for Eurocode 0 Basis of structural design Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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Tel: +44 (0)20 8996 7070 Email: copyrightbsigroup.com NA to BS EN 1994-1-2:2005 BSI Group Headquarters 389 Chiswick High Road, London W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 www.bsigroup.com/standards Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI