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BSI Standards Publication UK National Annex to Eurocode 3 Design of steel structures Part 1‑4 General rules – Supplementary rules for stainless steels NA+A1 2015 to BS EN 1993 1 4 2006+A1 2015 Incorpo[.]

NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 Incorporating corrigendum February 2016 BSI Standards Publication UK National Annex to Eurocode 3: Design of steel structures Part 1‑4: General rules – Supplementary rules for stainless steels NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 NATIONAL ANNEX Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued © The British Standards Institution 2016 Published by BSI Standards Limited 2016 ISBN 978 580 93242 ICS 91.040.01, 91.080.10 The following BSI references relate to the work on this standard: Committee reference CB/203 Draft for comment 08/30128099 DC Publication history First published February 2009 Amended December 2015 Amendments/corrigenda issued since publication Date Text affected 31 December 2015 See Introduction 29 February 2016 Minor editorial changes NATIONAL ANNEX NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 Contents Introduction  NA.1 Scope  NA.2 Nationally Determined Parameters  NA.3 Recommendations on the status and use of annexes  NA.4 References to non‑contradictory complementary information  Bibliography  © The British Standards Institution 2015  •  i NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 ii ã â The British Standards Institution 2015 NATIONAL ANNEX This page deliberately left blank NATIONAL ANNEX NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 National Annex (informative) to BS EN 1993‑1‑4:2006+A1:2015, 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 Committee CB/203, Design & execution of steel structures In the UK it is to be used in conjunction with BS EN 1993‑1‑4:2006+A1:2015 NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 supersedes NA to BS EN 1993-1-4:2006, which is withdrawn The start and finish of text introduced or altered by National Amendment No.1 is indicated in the text by tags  Minor editorial changes are not tagged NA.1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+A1:2015: • 2.1.4(2) • 6.1(2) • 2.1.5(1) • 6.2(3) • 5.1(2) • 7(1) • 5.5(1) • A.2(8) • 5.6(2) • A.3, Table A.4 b) The UK decisions on the status of BS EN 1993‑1‑4:2006+A1:2015 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+A1:2015 are given in clauses NA.2.2 to NA.2.9 NA.2.2 Further information on fracture toughness of ferritic stainless steels [BS EN 1993‑1‑4:2006+A1:2015, 2.1.4(2)] No further information is given © The British Standards Institution 2015  •  NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 NATIONAL ANNEX NA.2.3 Further information on the choice of through thickness properties [BS EN 1993‑1‑4:2006+A1:2015, 2.1.5(1)] No further information is given NA.2.4 Recommended values for partial safety factors [BS EN 1993‑1‑4:2006+A1:2015, 5.1(2)] The recommended values should be used NA.2.5 Interaction factors for members subject to compression and bending [BS EN 1993‑1‑4:2006+A1:2015, 5.5(1)] The recommended equations should be used NA.2.6 Shear buckling resistance [BS EN 1993‑1‑4:2006+A1:2015, 5.6(2)] The value η = 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 °C The value η = 1.00 should be used when the 0.2% proof strength exceeds 460 MPa and/or the temperature of steel exceeds 400 °C NA.2.7 Formulae for pull‑out strength of self‑tapping screws [BS EN 1993‑1‑4:2006+A1:2015, 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+A1:2015, 6.2(3)] The recommended values should be used NA.2.9 Design assisted by testing [BS EN 1993-1-4+A1:2015, 7(1)] No further information is given NA.3 Recommendations on the status and use of annexes NA.3.1 BS EN 1993-1-4:2006+A1:2015, Annex A.2(8) A less severe CRF may be used when validated local operating experience of at least years duration demonstrates the suitability of a grade in the adjacent lower CRC However, the maximum permitted improvement to the CRF is +5. ã â The British Standards Institution 2015 NATIONAL ANNEX NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015 The performance data should be obtained from a location less than km from the proposed site and, for coastal locations, less than 1 km inland from the proposed site Evaluation of the performance shall consider the material grade, quality of surface finish, orientation of the components and exposure to airborne contaminants (particularly chlorides) to ensure these are comparable to the proposed design NA.3.2 BS EN 1993-1-4:2006+A1:2015, Annex A, Table A.4 Less frequent cleaning is not permitted. NA.3.3 BS EN 1993‑1‑4:2006+A1:2015, Annex B BS EN 1993‑1‑4:2006+A1:2015, Annex B may be used in the UK Annex B.2 should be extended in the following way: B.2 Cold working 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 ri is not greater than 5t ⎛ ⎛ 1.673 ⎞ ⎞ fyb ⎜ A − Apb + Apb ⎜ 0.126 ⎟ ⎟ ⎝ (ri / t ) ⎠⎠ ⎝ fya = ! fu A ( b) ) (B.1) For austenitic cold rolled box sections (RHS and SHS) which have been formed via a circular tube and where t 

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