1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsUK National Annex to Eurocode 3: Design of steel structuresPart 1-2: General rules Structural fire designNA to BS EN 1993-1-2:2005Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARD
2、S, 18/02/2009 06:43, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-2:2005 BritiSh StANdArdPublishing and copyright informationthe BSi copyright notice displayed in this document indicates when the document was last issued. BSi 2008iSBN 978 0 580 54961 8iCS 13.220.50, 91.010.30, 91.080.10the following
3、 BSi references relate to the work on this standard: Committee reference B/525/31 draft for comment 07/30128095 dCPublication historyFirst published September 2008Amendments issued since publicationAmd. No. Date Text affected Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/02/2009 06:43, U
4、ncontrolled Copy, (c) BSIBritiSh StANdArd BSI 2008 iNA to BS EN 1993-1-2:2005Summary of pagesthis document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 2 and a back cover.Contentsintroduction 1NA.1 Scope 1NA.2 Nationally determined Parameters 1NA.3 decisions on the statu
5、s of informative annexes 2NA.4 references to non-contradictory complementary information 2List of tablestable NA.1 default values for critical temperatures 2Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/02/2009 06:43, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-2:2005ii BSI 2008BritiSh
6、StANdArdLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/02/2009 06:43, Uncontrolled Copy, (c) BSIBritiSh StANdArd BSI 2008 1NA to BS EN 1993-1-2:2005National Annex (informative) to BS EN 1993-1-2: 2005, Eurocode 3: Design of steel structures Part 1-2: General rules Structural fire designIn
7、troductionthis National Annex has been prepared by BSi Subcommittee B/525/31, Structural use of steel. it is to be used in conjunction with BS EN 1993-1-2:2005.NA.1 Scopethis National Annex gives:the decisions for the National determined Parameters described a) in the following sub clauses of BS EN
8、1993-1-2:2005:2.3 (1)2.3 (2)4.1 (2)4.2.3.6 (1)4.2.4 (2)the decisions on the status of BS EN 1993-1-2:2005 informative b) annexes; andreferences to non-contradictory complementary information.c) NA.2 Nationally Determined ParametersNA.2.1 Generalthe decisions for the Nationally determined Parameters
9、described in BS EN 1993-1-2:2005 are given in clauses NA.2.2 to NA.2.6.NA.2.2 Partial factor for the fire situation Mechanical properties, cM,fiBS EN 1993-1-2:2005, 2.3(1)Use the recommended value.NA.2.3 Partial factor for the fire situation Thermal properties, cM,fiBS EN 1993-1-2:2005, 2.3(2)Use th
10、e recommended value.NA.2.4 Use of advanced calculation models BS EN 1993-1-2:2005, 4.1(2)Advanced calculation models may be used. NA.2.5 Limiting temperature for Class 4 cross-sections BS EN 1993-1-2:2005, 4.2.3.6(1)Use the recommended value.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/
11、02/2009 06:43, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-2:20052 BSI 2008BritiSh StANdArdNA.2.6 Table 4.1- default values for critical temperatures BS EN 1993-1-2:2005, 4.2.4(2)the critical temperatures given in table NA.1 should be used.table NA.1 Default values for critical temperaturesDescript
12、ion of member Critical temperature (C) for utilization factor 00.7 0.6 0.5 0.4 0.3 0.2Compression members:a) Non-dimensional slenderness, = 0.4 485 526 562 598 646 694 = 0.6 470 518 554 590 637 686 = 0.8 451 510 546 583 627 678 = 1.0 434 505 541 577 619 672 = 1.2 422 502 538 573 614 668 = 1.4 415 50
13、0 536 572 611 666 = 1.6 411 500 535 571 610 665Protected beam supporting b) concrete slabs or composite slabs558 587 619 654 690 750Unprotected beam supporting c) concrete slabs or composite slabs594 621 650 670 717 775Beam not supporting concrete d) slabs and members in tension526 558 590 629 671 7
14、25NA.3 Decisions on the status of informative annexesNA.3.1 BS EN 1993-1-2:2005, Annex CBS EN 1993-1-2:2005, Annex C may be used.NA.3.2 BS EN 1993-1-2:2005, Annex DBS EN 1993-1-2:2005, Annex d should not be used. An alternative to Annex d is given in the references to supporting non-contradictory, c
15、omplementary information in NA.4.NA.3.3 BS EN 1993-1-2:2005, Annex EBS EN 1993-1-2:2005, Annex E may be used.NA.4 References to non-contradictory complementary informationreferences to the non-contradictory complementary information cited in this National Annex can be found at www.steel-ncci.co.uk1)
16、 1)in preparation Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/02/2009 06:43, Uncontrolled Copy, (c) BSIThis page deliberately left blankLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/02/2009 06:43, Uncontrolled Copy, (c) BSIBSI is the independent national body responsible f
17、or preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.British Standards Institution (BSI)raising standards worldwideBSI Group Headquarters389 Chiswick High Road London W4 4AL UKTel +44 (0)20 8996 9001Fax +44
18、 (0)20 8996 Standards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments oreditions.It is the constant aim of BSI to improve the quality of our products andservices. We would be grateful if anyone finding an inaccuracy orambiguit
19、y while using this British Standard would inform the Secretary ofthe technical committee responsible, the identity of which can be foundon the inside front cover.Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400BSI offers members an individual updating service called PLUS whichensures that subscribe
20、rs automatically receive the latest editions ofstandards.Buying standardsOrders for all BSI, international and foreign standards publicationsshould be addressed to BSI Customer Services.Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001Email: You may also buy directly using a debit/credit card from t
21、he BSI Shopon the website response to orders for international standards, it is BSI policy tosupply the BSI implementation of those that have been publishedas British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, European andinte
22、rnational standards through its Library.Various BSI electronic information services are also available which givedetails on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: Subscribing members of BSI are kept up to date with stan
23、dardsdevelopments and receive substantial discounts on the purchase priceof standards. For details of these and other benefits contact MembershipAdministration. Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: Information regarding online access to British Standards via BritishStandards Onl
24、ine can be found at information about BSI is available on the BSI website CopyrightCopyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of thepublications of the international standardization bodies. Except as permitted under theCopyright, Designs and Patents Act 198
25、8 no extract may be reproduced, stored in a retrievalsystem or transmitted in any form or by any means electronic, photocopying, recording orotherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard of necessarydetails such a
26、s symbols, and size, type or grade designations. If these details are to be used forany other purpose than implementation then the prior written permission of BSI must beobtained. Details and advice can be obtained from the Copyright & Licensing Manager.Tel: +44 (0)20 8996 7070 Email: WB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 2Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/02/2009 06:43, Uncontrolled Copy, (c) BSI
