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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
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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
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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.
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NA to BS EN 1993-1-4:2006 NATIONAL ANNEX
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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.
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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.
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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
