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)
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