BS NA EN 1995 2 UK National Annex to Eurocode 5 Design of timber structures Bridges United Kingdom of Great Britain and Northern Ireland In order to promote public education and public safety, equal j[.]
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MAGNA CARTA ( 297)
BS NA EN 1995-2 (2004) (English): UK National
Annex to Eurocode 5 Design of timber structures Bridges
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NATIONAL ANNEX
UK National Annex to
Eurocode 5: Design of
timber structures -
Part 2: Bridges
ICS 91.010.30; 91.080.20; 93.040
British Standards
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BYCOPYRIGHT LAW
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Publishing and copyright information
The BSI copyright notice displayed in this document indicates when the document was last issued
© BSI 2006 ISBN 0 580 49351 2
The following BSI references relate to the work on this standard: Committee reference B/525/5
Draft for comment 05/30128368
Publication history
First edition, October 2006
Amendments issued since publication
Amd no Date Text affected
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Contents
Introduction 1
Scope 1
NA.l
NA.2
NA.3
NA.4
Nationally Determined Parameters 1
Guidance on the use of informative annexes 3
Reference to non-contradictory complementary
information 3
Bibliography 4
List of tables
Table NA.l - Partial factors 1M for material properties 2
Table NA.2 Limiting values for deflections of beams and trusses 2
Summary of pages
This document comprises a front cover, an inside front cover,
pages i and ii, pages 1 to 4, an inside back cover and a back cover
© BSI 2006 •
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National Annex NA (inforlllative) to
BS EN 1995-2:2004, Eurocode 5: Design of
tilllber structures - Part 2: Bridges
Introduction
This National Annex has been prepared by BSI Subcommittee B/525/5,
Structural use of timber In the UK it is to be used in conjunction with
BS EN 1995-2 for the structural design of timber bridges, together with
BS EN 1995-1-1, BS EN 1990 and BS EN 1991 and their respective National Annexes
NA.l Scope
This National Annex gives:
a) the UK decisions for the Nationally Determined Parameters described in the following sub clauses of BS EN 1995-2:2004:
• 2.3.1.2(1)
• 2.4.1 7.2
• 7.3.1(2) b) the UK decisions on the status of BS EN 1995-2:2004 informative annexes;
c) reference to non-contradictory complementary information
NA.2 Nationally Determined Parameters
NA.2.1 Assignment of loads to load-duration classes
[BS EN 1995-2:2004, 2.3.1.2(1)]
Variable actions due to the passage of vehicular and pedestrian traffic should be regarded as short-term actions
Actions occurring during erection should be regarded as short-term actions
© BSI 2006 • 1
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NA.2.2 Partial factors for material properties
[BS EN 1995-2:2004, 2.4.1]
BS EN 1995-2:2004, Table 2.1 is implemented nationally by using Table NA.1
Table NA.1 Partial factors ni for material properties
Fundamental combinations Solid timber - untreated 1M = 1,3
Fatigue combinations
Accidental combinations
2 • © BSI 2006
Solid timber - preservatively treated Glued laminated timber
LVL, plywood, OSB Connections Shear connectors between timber and concrete in composite members Steel used in composite members
Pre-stressing steel elements Concrete used in composite members Timber and wood-based materials Connections
Shear connectors between timber and concrete in composite members All materials
NA.2.3 Limiting values for deflections
[BS EN 1995-2:2004, 7.2]
1M = 1,3
m 1,25
1M = 1,2
1M = 1,3
1M ,v 1,25
1M,s 1,15 1M,s 1,15
= 1,5
IM,fat = 1,0
IM,fat = 1,0
IM,v,fat = 1,0
m,acc = 1,0
BS EN 1995-2:2004, Table 7.1 is implemented nationally by using Table NA.2
Table NA.2 Limiting values for deflections of beams and trusses
Action Characteristic traffic load
Limiting value for deflections in
beams and trusses of span, l
Pedestrian load and low traffic load l/200
NA.2.4 Damping ratios [BS EN 1995-2:2004, 7.3.1(2)]
Where no other values have been verified, the damping ratio (0 should
be taken as:
t; = 0,010 for structures without mechanical joints;
t; = 0,015 for structures with mechanical joints
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NA.3 Guidance on the use of informative
annexes
NA.3.1 Fatigue verification [BS EN 1995-2:2004,
AnnexA]
BS EN 1995-2:2004, Annex A may be used
NA.3.2 Vibrations caused by pedestrians
[BS EN 1995-2:2004, Annex B]
BS EN 1995-2:2004, Annex B may be used
NA.4 Reference to non-contradictory
complementary information
PD 6693, Complementary info'Y'1nation for use with Eurocode 5, BSI, London (Publication date to be announced.)
© BSI 2006 • 3
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4 • © BSI 2006
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 5268, Structural use of timber
PD 6693, Complementary injO'Y'rnationfor use with Eurocode 5
BS EN 1990:2002, Eurocode - Basis of structural design
BS EN 1991 (all parts), Eurocode 1 -Actions on structures
BS EN 1995-1-1:2004, Eurocode 5 -Design of timber structures-Part 1-1: General Common rules and rules for buildings
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