Bsi bs en 01993 1 4 2006 + a1 2015 na + a1 15

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 0 580 93242 7
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 2015See Introduction
29 February 2016

Minor editorial changes


NATIONAL ANNEX

NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015

Contents
Introduction  1
NA.1Scope  1
NA.2 Nationally Determined Parameters  1
NA.3 Recommendations on the status and use of annexes  2
NA.4 References to non‑contradictory complementary information  4
Bibliography  5

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NATIONAL ANNEX

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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NA to BS EN 1993-1-4:2006, which is withdrawn.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.1Scope
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.

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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 5 years duration demonstrates the suitability of
a grade in the adjacent lower CRC. However, the maximum permitted
improvement to the CRF is +5.

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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 5 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 < 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.

fya =

⎛ ⎛ 0.19 ⎞ ⎞
⎛ 0.85fyb ⎞
+ 0.71A cr fu ⎜ ⎜
⎟
⎟ + 1⎟
⎝ p − 0.19 ⎠
⎝ ⎝ ε p − 0.19 ⎠ ⎠

( A − Acr ) ⎜ ε

where

A

εp is a strain parameter, defined as ε p =

! fu (B.2)
1

⎛
⎞
⎛ πt ⎞
⎜ 12.42 ⎜⎝ 2 (b + 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 A cr = π t ( 2ri + t ) + 16t 2 and ri can be assumed to be
equal to2t.

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NATIONAL ANNEX

Apb is the total corner cross‑section area for press braked
π nt
sections which can be calculated as Apb =
(2ri + t )
4
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 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.3.4
BS EN 1993‑1‑4:2006+A1:2015,

Annex C

BS EN 1993‑1‑4:2006+A1:2015, 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.

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NATIONAL ANNEX

NA+A1:2015 to BS EN 1993-1-4:2006+A1:2015

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, 20061).

1)

Available free of charge from www.steel-stainless.org/designmanual.
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NATIONAL ANNEX


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