BS NA EN 1991 1 2 UK National Annex to Eurocode 1 Actions on structures General actions Actions on structures exposed to fire United Kingdom of Great Britain and Northern Ireland In order to promote p[.]
Un i t e dKi n g d o mo fGr e a t Br i t a i na n dNo r t h e r nI r e l a n d ≠ EDI CTOFGOVERNMENT± I no r d e rt op r o mo t ep u b l i ce d u c a t i o na n dp u b l i cs a f e t y ,e q u a lj u s t i c ef o r a l l ,ab e t t e ri n f o r me dc i t i z e n r y ,t h er u l eo fl a w,wo r l dt r a d ea n dwo r l d p e a c e ,t h i sl e g a ld o c u me n ti sh e r e b yma d ea v a i l a b l eo nan o n c o mme r c i a l b a s i s ,a si ti st h er i g h to fa l lh u ma n st ok n o wa n ds p e a kt h el a wst h a t g o v e r nt h e m BS NA EN 1991-1-2 (2002) (English): UK National Annex to Eurocode Actions on structures General actions Actions on structures exposed to fire Nu l l iv e n d e mu s ,n u l l in e g a b i mu sa u td i f f e r e mu sRe c t u ma u tJu s t i c i a m Wewi l ls e l lt on oma n ,wewi l ln o td e n yo rd e f e rt oa n yma ne i t h e rJu s t i c eo rRi g h t MAGNACARTA( 97 ) NA to BS EN 1991-1-2:2002 NATIONAL ANNEX UK National Annex to Eurocode 1: Actions on structures Part 1-2: General actions - Actions on structures exposed to fire ICS 13.220.50, 91.010.30, 91.080.01 British Standards NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW NA to BS EN 1991-1-2:2002 Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued © BSI 2007 ISBN 580 50603 The following BSI references relate to the work on this standard: Committee reference B/525/1 Draft for comment 05/30128295 Publication history First published April 2007 Amendments issued since publication Amd no Date Text affected NA to BS EN 1991-1-2:2002 Contents Introduction NA.l NA.2 NA.3 NA.4 Scope Nationally Determined Parameters Decisions on the status of the informative annexes Reference to non-contradictory complementary information Bibliography Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to and a back cover © BSI 2007 ã NA to BS EN 1991-1-2:2002 ii ã â BSI 2007 This page deliberately left blank NA to BS EN 1991-1-2:2002 National Annex (inforlllative) to BS EN 1991-1-2:2002, Eurocode 1: Actions on structures - Part 1-2: General Actions - Actions on structures exposed to fire Introduction This National Annex has been prepared by BSI Subconunittee B/525/1, Actions (loadings) and basis of design In the UK it is to be used in conjunction with BS EN 1991-1-2:2002 NA.l Scope This National Annex gives: a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1991-1-2:2002: 2.4 (4) 3.1 (10) • 3.3.1.2 (1) 3.3.1.3 (1) 3.3.2 (2) • 4.2.2 (2) 4.3.1 (2) b) the UK decisions on the status of BS EN 1991-1-2:2002 informative annexes NA.2 Nationally Determined Parameters NA.2.1 Temperature analysis [BS EN 1991-1-2:2002, 2.4 (4)] BS EN 1991-1-2 recommends that temperature analysis is performed using a nominal temperature-time curve or a fIre model When performing temperature analysis in terms of the nominal temperature-time curve, the period of time within which to make the temperature analysis is specifIed: a) for England and Wales in Approved Document B to the Building Regulations 2000 [1]; b) for Scotland in the Scottish Building Standards Technical Handbooks [2] and [3]; c) for Northern Ireland in Technical Booklet E to the Building Regulations (Northern Ireland) 2000 [4] © BSI 2007 • NA to BS EN 1991-1-2:2002 When performing temperature analysis using fire models, no limited periods of fire resistance are specified Fire models used should be soundly based, robust and suitable for the given fire design scenario NA.2.2 Thermal actions for temperature analysis [BS EN 1991-1-2:2002, 3.1 (10)] The use of the nominal temperature-time curves specified in BS EN 1991-1-2:2002, 3.2 is permitted as appropriate to the application NOTE The nominal time-temperature relationships are taken from the furnace heating curves described in BS EN 1363-1 and BS EN 1363-2 The use of the natural fire models specified in BS EN 1991-1-2:2002, 3.3 is permitted NA.2.3 Simplified fire models - Compartment fires [BS EN 1991-1-2:2002, 3.3.1.2 (1)] The heating conditions for determining the gas temperature of compartment fires may be calculated in accordance with BS EN 1991-1-2:2002, AnnexA or Annex B but only in conjunction with the complementary information in PD 6688-1-2:2007, 3.2 NA.2.4 Simplified fire models - Localised fires [BS EN 1991-1-2:2002, 3.3.1.3 (1)] The heating conditions for local fires may be calculated in accordance with PD 6688-1-2:2007, 4.1 The use of BS EN 1991-1-2:2002, Annex C is not permitted NA.2.5 Advanced fire models [BS EN 1991-1-2:2002, 3.3.2 (2)] The "one-zone, two-zone", "multi-zone" and "computational fluid dynamic" advanced fire models described in BS EN 1991-1-2:2002, 3.3.2 (2) may be used NA.2.6 Simultaneity of actions - Additional actions [BS EN 1991-1-2:2002, 4.2.2 (2)] No additional actions need be considered NA.2.7 Combination rules for actions [BS EN 1991-1-2:2002, 4.3.1 (2)] The representative value of the variable action Q1 should be taken as the frequent value ƠFl.l Ql' ã â BSI 2007 NA to BS EN 1991-1-2:2002 NA.3 Decisions on the status of the informative annexes NA.3.1 Parametric temperature time curves [BS EN 1991-1 2:2002, Annex A] This annex may be used but only in conjunction with the complementary information in PD 6688-1-2:2007,3.1.1 NA.3.2 Thermal actions for external members [BS EN 1991-1-2:2002, Annex B] This annex may be used but only in conjunction with the complementary information in PD 6688-1-2:2007, 3.1.2 NA.3.3 Localised fires [BS EN 1991-1-2:2002, Annex C] This annex may not be used PD 6688-1-2:2007, 4.1 should be used as a replacement NA.3.4 Advanced fire models [BS EN 1991 1-2:2002, Annex D] This annex may be used NOTE This annex introduces the concept of heat balance in compartment fires and gives a very brief description of the fundamentals and complexities behind each of the types offire nwdels ranging from single zone models up to computationaljluid dynamic models However, apart from a statement on principles there is little in terms of calculations that would enable an engineer to carry out any detailed analysis NA.3.5 Fire load densities [BS EN 1991-1-2:2002, Annex E] This annex may not be used PD 6688-1-2:2007, Amlex A should be used as a replacement NA.3.6 Equivalent time of fire exposure [BS EN 1991-1-2:2002, Annex F] This annex may not be used PD 6688-1-2:2007, Annex B should be used as a replacement NA.3.7 Configuration factor [BS EN 1991-1-2:2002, Annex G] This annex may be used © BSI 2007 • NA to BS EN 1991-1-2:2002 NA.4 References to non-contradictory complementary information The following is a list of references that contain non-contradictory complementary information for use with BS EN 1991-1-2:2002 ã ã â BSI 2007 PD 6688-1-2 NA to BS EN 1991-1-2:2002 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 1363-1, Fire resistance tests - General requirements BS EN 1363-2, Fire resistance tests - Alternative and additional procedures PD 6688-1-2, Background paper to the UK National Annex to BS EN 1991-1-2 Other publications [ 1] TSO The Building Regulations 2000 Approved Document B: Fire Safety London: TSO, 2006 [2] SCOTTISH BUILDING STANDARDS AGENCY The Scottish Building Standards: Technical Handbook: Domestic Livingston: SBSA, 2006 [3] SCOTTISH BUILDING STANDARDS AGENCY The Scottish Building Standards: Technical Handbook: Non-domestic Livingston: SBSA, 2006 [4] DEPARTMENT OF FINANCE AND PERSONNEL NORTHERN IRELAND The Building Regulations (Northern Ireland) 2000 - Technical Booklet E -Fire Safety London: TSO, 2005 â BSI 2007 ã NA to BS EN 1991-1 2:2002 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 We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: +44 (0)2089969001 Fax: +44 (0)20 8996 7001 Email: orders@bsi-global.com Standards are also available from the BSI website at http://www.bsi-global.com In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: +44 (0)20 8996 711l Fax: +44 (0)20 8996 7048 Email: info@bsi-global.com Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)208996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsi-global.com Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline Further information about BSI is available on the BSI website at http://www.bsi-global.com Copyright - 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