Eurocode 3 Part 2 2006 UK NA Design of steel structures Steel bridges

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NA to BS EN 1993-2:2006

UK National Annex to

Eurocode 3: Design of

structures –

Part 2: Steel bridges

ICS 91.010.30; 81.080.10; 93.040

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

NATIONAL ANNEX

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Publishing and copyright information

The BSI copyright notice displayed in this document indicates when the
document was last issued.

© BSI 2008

ISBN 978 0 580 54975 5

The following BSI references relate to the work on this standard:
Committee reference B/525/10
Draft for comment

07/30128148 DC

Publication history

First published May 2008

Amendments issued since publication

Amd. no.

Date

Text affected

NA to BS EN 1993-2:2006

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NA to BS EN 1993-2:2006

Contents

Introduction 1

NA.1

Scope 1

NA.2

Nationally Determined Parameters 2

NA.3

Decision on the status of the informative annexes 10

NA.4

References to non-contradictory complementary
information 11

Bibliography 12

List of tables
Table NA.1 – Additional sacrificial thickness 4

Summary of pages
This document comprises a front cover, an inside front cover,
pages i and ii, pages 1 to 12, an inside back cover and a back cover.

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1

NA to BS EN 1993-2:2006

National Annex (informative) to

BS EN 1993-2:2006, Eurocode 3 – Design of steel

structures – Part 2: Steel bridges

Introduction

This National Annex has been prepared by BSI Subcommittee B/525/10,
Bridges, in consultation with B/525/31, Structural use of steel.

NA.1 Scope

This National Annex gives:
a) the UK decisions for the Nationally Determined Parameters

described in the following subclauses of BS EN 1993-2:2006:

2.1.3.2(1)

8.2.1.6(1)

2.1.3.3(5)

8.2.10(1)

2.1.3.4(1)

8.2.13(1)

2.1.3.4(2)

8.2.14(1)

2.3.1(1) (two places)

9.1.2(1)

3.2.3(2)

9.1.3(1)

3.2.3(3)

9.3(1)P

3.2.4(1)

9.3(2)P

3.4(1)

9.4.1(6)

3.5(1)

9.5.2(2)

3.6(1)

9.5.2(3)

3.6(2)

9.5.2(5)

4(1)

9.5.2(6)

4(4)

9.5.2(7)

5.2.1(4)

9.5.3(2) (two places)

5.4.1(1)

9.6(1) (two places)

6.1(1)P

9.7(1)

6.2.2.3(1)

A.3.3(1)P

6.2.2.5(1)

A.3.6(2)

6.3.2.3(1)

A.4.2.1(2)

6.3.4.2(1)

A.4.2.1(3)

6.3.4.2(7)

A.4.2.1(4)

7.1(3)

A.4.2.4(2)

7.3(1)

C.1.1(2)

8.1.3.2.1(1)

C.1.2.2(1)

8.1.6.3(1)

C.1.2.2(2)

8.2.1.4(1)

E.2(1)

8.2.1.5(1)

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b) the UK decisions on the status of BS EN 1993-2:2006 informative

annexes; and

c) references to non-contradictory complementary information.

NA.2 Nationally Determined Parameters

NA.2.1

Design working life
[BS EN 1993-2:2006, 2.1.3.2
(1)]

Unless otherwise specified for a particular project, the design working
life should be 120 years.

NA.2.2

Durability
[BS EN 1993-2:2006, 2.1.3.3
(5)]

Additional requirements for durable details should be specified for a
particular project.

NA.2.3

Robustness and structural integrity
[BS EN 1993-2:2006, 2.1.3.4
(1)]

Components which need to be designed for accidental design situations
should be specified for a particular project.

NA.2.4

Robustness and structural integrity
[BS EN 1993-2:2006, 2.1.3.4
(2)]

The safe life design method of fatigue assessment should be used unless
specified otherwise for a particular project.

NA.2.5

Actions and environmental influences
[BS EN 1993-2:2006, 2.3.1
(1)]

Actions not included in various parts of BS EN 1991 which need to be
considered in the design should be specified for a particular project.
Transient situations for maintenance and repair which need to be
considered should be specified for a particular project.

NA.2.6

Fracture toughness
[BS EN 1993-2:2006, 3.2.3
(2)]

The example in Table 3.1 should not be used and NA to
BS EN 1993-1-10:2005, NA.2.1, should be followed.

NA.2.7

Fracture toughness
[BS EN 1993-2:2006, 3.2.3
(3)]

For components in compression, the values for

σ

Ed

of 0,25

fy

(t) should

be used for all magnitudes of

σ

Ed

.

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NA to BS EN 1993-2:2006

NA.2.8

Through thickness properties
[BS EN 1993-2:2006, 3.2.4
(1)]

The recommendations in Table 3.2 should not be used and NA to
BS EN 1993-1-10:2005, NA.2.2, should be followed.

NA.2.9

Cables and other tension elements
[BS EN 1993-2:2006, 3.4
(1)]

The types of cable which are deemed to satisfy the requirements for
durability should be specified for a particular project.

NA.2.10

Bearings
[BS EN 1993-2:2006, 3.5
(1)]

The types of bearing which may be used should be specified for a
particular project.

NA.2.11

Other bridge components
[BS EN 1993-2:2006, 3.6
(1)]

The types of expansion joint, guardrail, parapet and other ancillary
items which may be used should be specified for a particular project.

NA.2.12

Other bridge components
[BS EN 1993-2:2006, 3.6
(2)]

The bridge deck surfacing systems, the products used and the methods
of application should be specified for a particular project.

NA.2.13

Durability
[BS EN 1993-2:2006, 4
(1)]

The access requirements for inspection and maintenance should be
specified for a particular project.
Box sections that are provided with maintenance access systems should
be designed such that no large accumulation of moisture can occur
internally and air quality is maintained.

NA.2.14

Durability [BS EN 1993-2:2006, 4(4)]

For surfaces that cannot be inspected, the following design
considerations should be addressed and appropriate measures taken or
allowances made.
a) Sealing against corrosion. It is difficult to effectively seal the

internal void of fabricated box girder constructions, even when
using continuous welding, so this approach to corrosion control is
not recommended. Instead, fabricated box girders should be
detailed to allow free drainage of any condensing water at the
lowest point, and a sacrificial thickness of steel should be added
that is appropriate for a C2 type environment, as described in
item c).

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Drain holes should be sufficiently large that they do not become
blocked, but not so large as to allow wildlife to enter. Drainage
tubes of a non-corroding material should be used and should be
arranged to ensure that any water containing corrosion products is
diverted away from external surfaces that could easily be stained.
For structural hollow sections, the internal void should either be
effectively sealed to prevent the ingress of air, moisture and
contaminants, or alternatively the approach for fabricated box
girders described earlier may be followed.
Where structural hollow sections are to be sealed, they should be
checked for structural adequacy under differential pressures
between the internal and external atmospheres. Sealed structural
hollow sections should be no less than 5 mm thick. Where the
design life is less than 50 years this value may be reduced to 4 mm.
Narrow gaps (<10 mm wide) and crevices should be avoided.
Where this is impractical, they should be packed using steel plates
and sealed to prevent the ingress of air, moisture and contaminants.

b) Measures to ensure air tightness of box girders. Where

structural hollow sections are to be effectively sealed, they should
be tested to ensure air tightness as required by the project
specification.

c) Extra steel thickness for inaccessible surfaces. Inaccessible

surfaces that have not been effectively sealed against the effects of
air, moisture and contaminants should be provided with an
additional sacrificial thickness appropriate to the environment, as
shown in Table NA.1.

ISO 9223 describes two methods for classifying atmospheric
corrosivity. Unfortunately, both methods require measurements to be
taken over a minimum of one year to obtain representative average
values. In most situations this will not be possible or practical at the
design stage. Therefore, in the absence of a scientific approach, a
judgement needs to be made. BS EN ISO 12944-2 relates the
classifications C1 to C5 to descriptions of typical environments, which
should form the basis of such a judgement along with a site visit to
assess the nature of the bridge location. Additional information should
be sought from the client or the maintaining authority to determine
future development plans.

Table NA.1

Additional sacrificial thickness

Atmospheric corrosion

classification (ISO 9223)

Additional sacrificial thickness

mm
Structural steel

Weathering steel

C1

Not applicable

Not applicable

C2

2

0,5

C3

4

1,0

C4

6

1,5

C5

Not appropriate

Not appropriate

NOTE C1 relates to dry heated interiors, which are seldom applicable to
bridges.

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NA to BS EN 1993-2:2006

NOTE 1 The environment inside a closed box girder (unsealed) is likely
to be similar to a C2 classification. However, for an open top box section
with composite deck without any access for inspection and maintenance,
the environment is C3.
NOTE 2 The sacrificial thicknesses given in Table NA.1 assume free
drainage of the steel surfaces. Where free drainage cannot be guaranteed,
unprotected steel surfaces are not recommended.

NA.2.15

Effects of deformed geometry of the structure
[BS EN 1993-2:2006, 5.2.1
(4)]

No additional information.

NA.2.16

Methods of analysis considering material
non-linearities [BS EN 1993-2:2006, 5.4.1
(1)]

The circumstances where plastic methods of global analysis are
acceptable should be specified for a particular project.

NA.2.17

Ultimate limit states
[BS EN 1993-2:2006, 6.1
(1)]

The recommended values for partial factors

γ

Mi

given in Note 2 should

be used.

NA.2.18

Shear lag effects
[BS EN 1993-2:2006, 6.2.2.3
(1)]

The recommendation in NA to BS EN 1993-1-5:2006, NA.2.2, should
be followed. No additional information is provided.

NA.2.19

Effects of local buckling for class 4 cross
sections [BS EN 1993-2:2006, 6.2.2.5
(1)]

Both methods of considering the effects of class 4 cross sections are
acceptable.

NA.2.20

Lateral torsional buckling curves for rolled
sections or equivalent welded sections
[BS EN 1993-2:2006, 6.3.2.3
(1)]

See NA.4 for complementary guidance on lateral torsional buckling.

NA.2.21

General method for lateral and lateral torsional
buckling of structural components
[BS EN 1993-2:2006, 6.3.4.2
(1)]

No additional information.

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NA.2.22

General method for lateral and lateral torsional
buckling of structural components
[BS EN 1993-2:2006, 6.3.4.2
(7)]

See NA.4 for complementary guidance on lateral torsional buckling.

NA.2.23

Serviceability limit states
[BS EN 1993-2:2006, 7.1
(3)]

Additional requirements for serviceability should be specified for a
particular project.

NA.2.24

Limitations for stress
[BS EN 1993-2:2006, 7.3
(1)]

The recommended value for the partial factor

γ

Mser

given in Note 2

should be used.

NA.2.25

Injection bolts
[BS EN 1993-2:2006, 8.1.3.2.1
(1)]

The requirements for the use of injection bolts should be specified for a
particular project.

NA.2.26

Hybrid connections
[BS EN 1993-2:2006, 8.1.6.3
(1)]

The ultimate capacity of hybrid slip resistant bolts acting in friction and
welded connections should be taken as no greater than 90% of their
combined capacities.

NA.2.27

Butt welds [BS EN 1993-2:2006, 8.2.1.4(1)]

No additional information.

NA.2.28

Plug welds [BS EN 1993-2:2006, 8.2.1.5(1)]

The requirements for the use of plug welds should be specified for a
particular project.

NA.2.29

Flare groove welds
[BS EN 1993-2:2006, 8.2.1.6
(1)]

The requirements for the use of flare groove welds should be specified
for a particular project.

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NA to BS EN 1993-2:2006

NA.2.30

Eccentrically loaded single fillet or single-sided
partial penetration butt welds
[BS EN 1993-2:2006, 8.2.10
(1)]

Eccentrically loaded single fillet welds or single-sided partial
penetration butt welds should not be used to transmit a bending
moment about the longitudinal axis of the weld.
The requirements for the use of eccentrically loaded single fillet welds
or single-sided partial penetration butt welds for other situations should
be specified for a particular project.

NA.2.31

Analysis of structural joints connecting H- and
I-sections [BS EN 1993-2:2006, 8.2.13
(1)]

The requirements for the use of structural joints connecting H- and
I-sections should be specified for a particular project.

NA.2.32

Hollow section joints
[BS EN 1993-2:2006, 8.2.14
(1)]

The requirements for the use of structural joints connecting hollow
sections should be specified for a particular project.

NA.2.33

Design of road bridges for fatigue
[BS EN 1993-2:2006, 9.1.2
(1)]

All details that are subjected to cyclic loading should be checked for
fatigue.

NA.2.34

Design of railway bridges for fatigue
[BS EN 1993-2:2006, 9.1.3
(1)]

Those elements where no fatigue checks are required should be
specified for a particular project.

NA.2.35

Partial factors for fatigue verifications
[BS EN 1993-2:2006, 9.3
(1)P]

The recommended value should be used.

NA.2.36

Partial factors for fatigue verifications
[BS EN 1993-2:2006, 9.3
(2)P]

BS EN 1993-1-9:2005, Table 3.1 should not be used; the
recommendation in NA to BS EN 1993-1-9:2005, NA.2.5, should be
followed.

NA.2.37

Fatigue stress range [BS EN 1993-2:2006,
9.4.1
(6)]

See NA to BS EN 1993-1-9:2005, NA.2.7, for additional guidance.

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NA.2.38

Damage equivalence factors

λ

for road bridges

[BS EN 1993-2:2006, 9.5.2(2)]

No additional information.

NA.2.39

Damage equivalence factors

λ

for road bridges

[BS EN 1993-2:2006, 9.5.2(3)]

In deriving

λ

2,

Q

m1

should be taken as 260 kN for UK roads that are not

subject to weight restrictions.

NOTE See NA to BS EN 1991-2, Table NA.4 for guidance on n

i

or use other

site specific predictions that are more onerous.

NA.2.40

Damage equivalence factors

λ

for road bridges

[BS EN 1993-2:2006, 9.5.2(5)]

The design life of the bridge t

Ld

should be 120 years.

NA.2.41

Damage equivalence factors

λ

for road bridges

[BS EN 1993-2:2006, 9.5.2(6)]

In deriving

λ

4,

Q

m1

should be taken as 260 kN for all traffic lanes.

NOTE See NA to BS EN 1991-2, Table NA.4 for guidance n

i

or use other

site specific predictions that are more onerous.

NA.2.42

Damage equivalence factors

λ

for road bridges

[BS EN 1993-2:2006, 9.5.2(7)]

The recommended factors should be used.

NA.2.43

Damage equivalence factors

λ

for railway

bridges [BS EN 1993-2:2006, 9.5.3(2)]

Note 1 – Recommended values should be used.
Note 3 –

λ

1

should be specified for specialized lines.

NA.2.44

Fatigue strength [BS EN 1993-2:2006, 9.6(1)]

Note 1 and Note 2 – No additional information.

NA.2.45

Post weld treatment
[BS EN 1993-2:2006, 9.7
(1)]

Requirements for post weld treatment should be specified for a
particular project.

NA.2.46

Anchorage of bearings [BS EN 1993-2:2006,
A.3.3
(1)P]

The recommended values should be used.

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NA to BS EN 1993-2:2006

NA.2.47

Resistance of bearings to rolling and sliding
[BS EN 1993-2:2006, A.3.6
(2)]

The recommended values should be used.

NA.2.48

Determination of design values of actions on the
bearings and movements of the bearings
[BS EN 1993-2:2006, A.4.2.1
(2)]

No additional information. See also the National Annex to
BS EN 1991-1-5.

NA.2.49

Determination of design values of actions on the
bearings and movements of the bearings
[BS EN 1993-2:2006, A.4.2.1
(3)]

The recommended values should be used.

NOTE This allowance caters only for the uncertainty of the temperature
at the time of the setting of the bearings.

NA.2.50

Determination of design values of actions on the
bearings and movements of the bearings
[BS EN 1993-2:2006, A.4.2.1
(4)]

The recommended values of %T

0

given in Table A.4 should be used,

and %T

γ

should be taken as 5

°

C.

NOTE The temperature difference ¹T

K

is the maximum contraction

range or maximum expansion range as appropriate, according to
BS EN 1991-1-5.

NA.2.51

Actions for accidental design situations
[BS EN 1993-2:2006, A.4.2.4
(2)]

No additional information. See also the National Annex to
BS EN 1991-1-7.

NA.2.52

Highway bridges [BS EN 1993-2:2006, C.1.1(2)]

No additional information.

NA.2.53

Thickness of deck plates and minimum stiffness
of stiffeners [BS EN 1993-2:2006, C.1.2.2
(1)]

The following values of minimum deck plate dimensions should be used.
a) Deck plate thickness in the most heavily loaded traffic lane in each

carriageway:

t

W 14 mm × e/300 for asphalt layer W 70 mm;

t

W 16 mm × e/300 for asphalt layer > 40 mm and < 70 mm.

The thickness may be reduced by 2 mm for lanes occupied by light
vehicles.

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b) Spacing of the supports of the deck plate by webs of stiffeners in

the carriageway: e

u 380 mm.

Locally, e may be increased by 5% where required, e.g. for
adaptation to bridge curvature in plan.

c) Deck plate thickness for foot bridges and footpaths which can

carry maintenance vehicles:

t

W 10mm and e/t u 50;

e

u 750 mm.

d) Deck plate thickness for foot bridges and footpaths with no

maintenance vehicles:
t

W 6 mm and e/t u 92;

e

u 900 mm.

e) Thickness of stiffener:

t

W 6 mm.

NA.2.54

Thickness of deck plates and minimum stiffness
of stiffeners [BS EN 1993-2:2006, C.1.2.2
(2)]

No additional information.

NA.2.55

Combination factor
[BS EN 1993-2:2006, E.2
(1)]

Account should not be taken of the weight distribution of several lorries
and the combination factor

ψ

should be taken as 1,0.

NA.3 Decision on the status of the

informative annexes

NA.3.1

Annex C – Recommendations for the structural
detailing of steel bridge decks

Annex C may be used.

NA.3.2

Annex D – Buckling lengths of members in
bridges and assumptions for geometrical
imperfections

Annex D may be used.

NA.3.3

Annex E – Combination of effects from local
wheel and tyre loads and from global traffic
loads on road bridges

Annex E may be used.

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NA to BS EN 1993-2:2006

NA.4 References to non-contradictory

complementary information

PD 6695-2, Recommendations for the design of bridges to
BS EN 1993

1)

.

1)

In preparation.

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Bibliography

For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
BS EN 1993-1-9, Eurocode 3: Design of steel structures – Part 1-9:
Fatigue
BS EN ISO 12944-2, Paints and varnishes – Corrosion protection of
steel structures by protective paint systems – Part 2: Classification
of environments
ISO 9223, Corrosion of metals and alloys – Corrosivity of
atmospheres – Classification
NA to BS EN 1991-2, Eurocode 1: Actions on structures –
Part 2: Traffic loads on bridges
NA to BS EN 1991-1-7:2006, Eurocode 1: Actions on structures –
Part 1-7: General actions – Accidental actions

2)

NA to BS EN 1993-1-5:2006, UK National Annex to Eurocode 3:
Design of steel structures – Part 1-5: Plated structural elements
NA to BS EN 1993-1-9:2005, UK National Annex to Eurocode 3:
Design of steel structures – Part 1-9: Fatigue

2)

NA to BS EN 1993-1-10:2005, Eurocode 3: Design of steel
structures – Part 1-10: Material toughness and through-thickness
properties

2)

PD 6695-2, Recommendations for the design of bridges to BS EN 1993

2)

2)

In preparation.

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necessary details such as symbols, and size, type or grade designations. If these
details are to be used for any other purpose than implementation then the prior
written permission of BSI must be obtained.
Details and advice can be obtained from the Copyright & Licensing Manager.
Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553.
Email: copyright@bsi-global.com.

NA to BS EN 1993-2:2006

389 Chiswick High Road
London
W4 4AL

Licensed copy: BSI USER 06 Document Controller, Midmac Contracting Co. W.L.L, Version correct as of 26/05/2010

14:47, (c) BSI


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