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1、a Date: 18 September 2008 Origin: National Latest date for receipt of comments: 31 October 2008 Project no.: 2005/00165 Responsible committee: B/525/31 Structural use of steel Interested committees: Title: Draft NA to BS EN 1993-1-4 Design of steel structures Part 1-4: General rules Supplementary ru
2、les for stainless steels Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WA
3、RNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 October 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. Se
4、e overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to
5、 dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email . British, International and foreign standards are also available from BSI Customer Services. Information on the co-o
6、perating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Servic
7、e on the BSI web site http:/. Direct tel: 020 8996 7413 Responsible Committee Secretary: Nicola Harrison (BSI) E-mail: Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30128099 DC Licensed Cop
8、yChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI b Introduction Your comments on this draft are invited and will assist in the preparation of the resulting British Standard. If no comments are received to the contrary, this draft may be implemented unchanged as a Britis
9、h Standard. Please note that this is a draft and not a typeset document. Editorial comments are welcomed, but you are advised not to comment on detailed matters of typography and layout. Submission of comments The guidance given below is intended to ensure that all comments receive efficient and app
10、ropriate attention by the responsible BSI committee. This draft British Standard is available for review and comment online via the BSI British Standards Draft Review system at http:/. Registration is free and takes less than a minute. Once you have registered on the Draft Review system you will be
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13、ing will not be corrected. A link to the BSI British Standards Draft Review system, or to a specific draft hosted on the system, may be distributed to other interested parties so that they may register and submit comments. It is not necessary to purchase a copy of the draft in order to review or com
14、ment on it; however, additional copies of this draft may be purchased from BSI, Tel: +44(0) 20 8996 9001 or email: . Drafts and standards are also available in PDF format for immediate download from the BSI Shop http:/ Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy
15、, (c) BSI WARNING. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 OCTOBER 2008. 1 Draft UK National Annex to Eurocode 3: Design of steel structures Part 1-4: General rules Supplementary rules for stainless steels Licensed CopyChinese Unive
16、rsity of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI WARNING. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 OCTOBER 2008. 2 Contents Introduction 3 NA.1 Scope 3 NA.2 Nationally Determined Parameters 3 NA.3 Decisions on the sta
17、tus of informative annexes 4 NA.4 References to non-contradictory complementary information 5 Bibliography 6 Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI WARNING. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT C
18、URRENT BEYOND 31 OCTOBER 2008. 3 National Annex (informative) to BS EN 1993-1-4:2006, Eurocode 3: Design of steel structures Part 1-4: General rules Supplementary rules for stainless steels Introduction This National Annex has been prepared by BSI Subcommittee B/525/31, Structural use of steel. In t
19、he UK it is to be used in conjunction with BS EN 1993-1-4:2006. NA.1 Scope This National Annex gives: a) The UK decisions for the National Determined Parameters described in the following subclauses of BS EN 1993-1-4:2006: 2.1.4(2) 2.1.5(1) 5.1(2) 5.5(1) 5.6(2) 6.1(2) 6.2(3) b) The UK decisions on t
20、he status of BS EN 1993-1-4:2006 informative annexes c) References to non-contradictory complementary information. NA.2 Nationally Determined Parameters NA.2.1 General UK decisions for the Nationally Determined Parameters decided in BS EN 1993-1-4:2006 are given in clauses NA.2.2 to NA.2.8. NA.2.2 F
21、urther information on fracture toughness of ferritic stainless steels BS EN 1993-1-4:2006, 2.1.4(2) No further information is given. NA.2.3 Further information on the choice of through thickness properties BS EN 1993-1-4:2006, 2.1.5(2) No further information is given. NA.2.4 Recommended values for p
22、artial safety factors BS EN 1993-1-4:2006, 5.1(2) The recommend values should be used. NA.2.5 Interaction factors for members subject to compression and bending BS EN 1993-1-4:2006, 5.5(1) The recommended equations should be used. NA.2.6 Shear buckling resistance BS EN 1993-1-4:2006, 5.6(2) The valu
23、e = 1.20 should be used when the 0.2 % proof strength of the steel is not higher than 460 MPa and when the temperature of the steel is does not exceed 400 C. The value = 1.00 should be used when the temperature of steel exceeds 400 C. Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, U
24、ncontrolled Copy, (c) BSI WARNING. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 OCTOBER 2008. 4 NA.2.7 Formulae for pull-out strength of self-tapping screws BS EN 1993-1-4:2006, 6.1(2) Formulae for pull-out strength derived from testing
25、may be given in Certified Product Declarations. NA.2.8 Shear resistance of a bolt BS EN 1993-1-4:2006, 6.2(3) The recommend values should be used. NA.3 Decisions on the status of informative annexes NA.3.1 BS EN 1993-1-4:2006, Annex A BS EN 1993-1-4:2006, Annex A may be used in the UK. NA.3.2 BS EN
26、1993-1-4:2006, Annex B BS EN 1993-1-4:2006, Annex B may be used in the UK. Annex B.3 should be extended in the following way: B.3 Work hardening from fabrication (1) Work hardening caused during fabrication of cold formed structural components may be utilised in the design in the following way: a) F
27、or austenitic stainless steel sections formed by press braking, an enhanced yield strength fya may be adopted to account for cold working in 90 section corners where ri is not greater than 5t. () ()0.126 ya 1.673 / ybpbpb i u fAAA rt ff A + = (6.3) b) For austenitic cold rolled box sections (RHS and
28、 SHS) which have been formed via a circular tube and where t 8mm and ri not greater than 5t, an enhanced yield strength fya may be adopted to account for cold working in the section faces and an extended corner region. () ya 0.85 0.19 0.711 0.190.19 yb crcru pp u f AAAf ff A + = (6.4) where p is a s
29、train parameter, defined as () 1 12.420.83 2 p t bh = + + A is the gross cross-sectional area of the section Acr is the total corner cross-sectional area for cold rolled box sections including a region of 2t, which extends both sides of each corner. Acr can be obtained with the following expression(
30、) 2 216 cri Atrtt=+ and ri can be assumed to be equal to 2t. Apb is the total corner cross-section area for press braked sections which can be calculated as () pb 2 4 i nt Art =+ Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI WARNING. THIS IS A DRAFT AND M
31、UST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 OCTOBER 2008. 5 fyb, fu are the yield strength and the ultimate tensile strength of the basic material (i.e. the flat sheet material out of which sections are made by cold forming). fu should be taken as the minim
32、um value of the range specified in the material standard. n is the number of 90 corners The increase in yield strength due to cold working should not be utilised for sections that are annealed or subject to heat treatment after forming which may produce softening. c) For all section types, work hard
33、ening may be utilised in the design if the effect of work hardening has been verified by full size tests in accordance with Section 7. (2) For design of connections which are not part of the full size testing, nominal strength values should be used. NA.3.3 BS EN 1993-1-4:2006, Annex C BS EN 1993-1-4
34、:2006, Annex C may be used in the UK. The following addition should be made to the National Annex for BS EN 1993-1-2 (Annex C of BS EN 1993-1-2): For steel grades 1.4318, 1.4318 C850 and 1.4571 C850 the values at elevated temperatures given in Reference 1 may be used. NA.4 References to non-contradi
35、ctory complementary information Reference 2 contains a list of references to non-contradictory, complementary information for use with BS EN 1993-1-4:2006. Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI WARNING. THIS IS A DRAFT AND MUST NOT BE REGARDED OR
36、USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 OCTOBER 2008. 6 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 1993-1-2:2005, Eur
37、ocode 3 Design of steel structures Part 1-2: General rules Structural fire design Other publications 1 Euro Inox Design Manual for Structural Stainless Steel, Euro Inox and The Steel Construction Institute, 2006 2 A list of non-contradictory, complementary information to be used with Eurocode 3: Design of Steel Structures: Part 1.4 General rules - Supplementary rules for stainless steels1). 1) In development Licensed CopyChinese University of Hong Kong, 21/10/2008 03:04, Uncontrolled Copy, (c) BSI