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BS NA EN 1993-1-4: UK National Annex to Eurocode 3. Design of steel structures. General rules. Supplementary rules for stainless steels PDF

2006·0.89 MB·English
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Preview BS NA EN 1993-1-4: UK National Annex to Eurocode 3. Design of steel structures. General rules. Supplementary rules for stainless steels

United Kingdom of Great Britain and Northern Ireland ≠ EDICT OF GOVERNMENT ± In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. BS NA EN 1993-1-4 (2006) (English): UK National Annex to Eurocode 3. Design of steel structures. General rules. Supplementary rules for stainless steels Nulli vendemus, nulli negabimus aut differemus Rectum aut Justiciam. We will sell to no man, we will not deny or defer to any man either Justice or Right. MAGNA CARTA (1297) NA to BS EN 1993-1-4:2006 UK National Annex to Eurocode 3: Design of steel structures Part 1-4: General rules - Supplementary rules for stainless steels NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITIED BY COPYRIGHT LAW _. .... •• raising standards worldwide™ ~. NA to BS EN 1993-1-4:2006 NATIONAL ANNEX Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. © BSI2009 ISBN 978 0 580 54963 2 ICS 91.040.01, 91.080.10 The following BSI references relate to the work on this standard: Committee reference B/525/31 Draft for comment 08/30128099 DC Publication history First published February 2009 Amendments issued since publication Date Text affected NATIONAL ANNEX NA to BS EN 1993-1-4:2006 Contents Introduction 1 NA.1 Scope 1 NA.2 Nationally Determined Parameters 1 NA.3 Decisions on the status of informative annexes 2 NA.4 References to non-contradictory complementary information 3 Bibliography 4 Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 4, an inside back cover and a back cover. © 8512009 • NA to BS EN 1993-1-4:2006 NATIONAL ANNEX II • © B512009 This page deliberately left blank NATIONAL ANNEX NA to BS EN 1993-1-4:2006 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 the 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) • 5.6(2) • 2.1.5(1) • 6.1(2) • 5.1(2) • 6.2(3) • 5.5(1) b) The UK decisions on the 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 Further 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 partial safety factors [BS EN 1993-1-4:2006, 5.1(2)] The recommended values should be used. © 8512009 • 1 NA to BS EN 1993-1-4:2006 NATIONAL ANNEX 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 value 11 = 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 does not exceed 400 0(, The value 11 1.00 should be used when the temperature of steel exceeds 400 0(, 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 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 recommended 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 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 utilized in the design in the following way: a) For 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 r is not greater than St. i f~ :·:t~26 ~ JJ ( ( A - Apb ) + Apb ( (r; f (6.3) ~ A ~u b) For austenitic cold rolled box sections (RHS and SHS) which have been formed via a circular tube and where t < 8 mm 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. 1 (A A )( 0.85fYb J+0.71A f (( 0.19 J+1 cr c _ 0.19 cr u c - 0.19 ) p p fya A (fu (6.4) 2 • © BSI 2009 NATIONAL ANNEX NA to BS EN 1993-1-4:2006 where Ep is a strain parameter, defined as cp (12.42( 2(:: h) )+0.83) 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 Acr 1rt( 2~ + t) + 16t2 and rj 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 Apb = n~t(2~+t) fybt 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 minimum 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 utilized for sections that are annealed or subject to heat treatment after forming which may produce softening. c) For all section types, work hardening 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 1993-1-4:2006, Annex C may be used in the UK. NA.4 References to non-contradictory complementary information References cited in this National Annex to non-contradictory, complementary information can be found at www.steel-ncci.co.uk. Whilst this material is likely to be technically authoritative, not all of it has been reviewed by the UK national committee, and users should satisfy themselves of its fitness for their particular purpose. In particular, they should be aware that material indicated as not having been endorsed by the committee might contain elements that are in conflict with the Eurocode. ©BS12009 • 3 NA to BS EN 1993-1-4:2006 NATIONAL ANNEX 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, Eurocode 3 - Design of steel structures - Part 1-2: General rules - Structural fire design Other publications [1] Design Manual for Structural Stainless Steel, Third Edition, Building Series, Volume 11, Euro Inox and The Steel Construction Institute, 2006'). 1} Available free of charge from Euro Inox www.euro-inox.org or www.steel-stainless.org/designmanual. 4 • © 8512009

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