NA to BS EN 1995 1 2 2004 UK National Annex to Eurocode 5 Design of timber structures – Part 1 2 General – Structural fire design ICS 13 220 50; 91 010 30; 91 080 20 NO COPYING WITHOUT BSI PERMISSION[.]
Trang 1UK National Annex to
Eurocode 5: Design of
timber structures –
Part 1-2: General – Structural fire
design
ICS 13.220.50; 91.010.30; 91.080.20
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
NATIONAL ANNEX
Trang 2Publishing and copyright information
The BSI copyright notice displayed in this document indicates when the document was last issued
© BSI 2006 ISBN 0 580 49350 4 The following BSI references relate to the work on this standard: Committee reference B/525/5
Draft for comment 05/30134000
Publication history
First edition, October 2006
Amendments issued since publication
Trang 3© BSI 2006 • i
Contents
Introduction 1
NA.1 Scope 1
NA.2 Nationally Determined Parameters 1
NA.3 Guidance on using informative annexes 2
NA.4 Reference to non-contradictory complementary
information 3
Bibliography 4
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
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National Annex NA (informative) to
BS EN 1995-1-2:2004, Eurocode 5: Design of
timber structures – Part 1-2: General –
Structural fire design
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 1995-1-2 for the structural fire design of timber structures, together with BS EN 1995-1-1, BS EN 1990 and BS EN 1991 and their National Annexes
NA.1 Scope
This National Annex gives:
a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1995-1-2:2004:
• 2.1.3(2)
• 2.3(1)P
• 2.3(2)P
• 2.4.2(3)
• 4.2.1(1)
b) the UK decisions on the status of BS EN 1995-1-2:2004 informative annexes;
c) reference to non-contradictory complementary information
NA.2 Nationally Determined Parameters
NA.2.1 Maximum temperature rise for separating
function in parametric fire exposure [BS EN 1995-1-2:2004, 2.1.3(2)]
During the decay phase the temperature rise of the unexposed side of a separating construction should be limited to the following:
a) average temperature rise (ΔΘ1) of 200 K;
b) maximum temperature rise (ΔΘ2) of 240 K
NA.2.2 Partial factor for material properties in fire
[BS EN 1995-1-2:2004, 2.3(1)P]
The partial factor for material properties in fire, γM,fi, should be taken
as 1,0
Trang 6NA.2.3 Partial factor for mechanical resistance of
connections in a fire situation [BS EN 1995-1-2:2004, 2.3(2)P]
The partial factor for mechanical resistance of connections in a fire situation, γM,fi, should be taken as 1,0
NA.2.4 Reduction factor ηfi for combinations of actions
[BS EN 1995-1-2:2004, 2.4.2(3)]
The reduction factor for combinations of actions, ηfi, should be evaluated using expression 2.9 of BS EN 1995-1-2, but is not permitted
to have a value less than 0,4
NA.2.5 Procedure for determining cross-sectional
properties [BS EN 1995-1-2:2004, 4.2.1(1)]
The cross-sectional properties in fire should be determined using the
reduced cross-section method of 4.2.2.
NA.3 Guidance on using informative
annexes
NA.3.1 Parametric fire exposure [BS EN 1995-1-2:2004,
Annex A]
BS EN 1995-1-2:2004, Annex A should not be used
NA.3.2 Advanced calculation methods
[BS EN 1995-1-2:2004, Annex B]
BS EN 1995-1-2:2004, Annex B should not be used
NA.3.3 Load-bearing floor joists and wall studs in
assemblies whose cavities are completely filled with insulation [BS EN 1995-1-2:2004, Annex C]
BS EN 1995-1-2:2004, Annex C may be used
NA.3.4 Charring of members in wall and floor
assemblies with void cavities [BS EN 1995-1-2:2004, Annex D]
BS EN 1995-1-2:2004, Annex D should not be used
Trang 7© BSI 2006 • 3
NA.3.5 Analysis of the separating function of wall and
floor assemblies [BS EN 1995-1-2:2004,
Annex E]
BS EN 1995-1-2:2004, Annex E should not be used
NA.3.6 Guidance for users of EN 1995-1-2
[BS EN 1995-1-2:2004, Annex F]
BS EN 1995-1-2:2004, Annex F may be used
NA.4 Reference to non-contradictory
complementary information
Material from BS 5268, Structural use of timber
PD 6693, Complementary information for use with Eurocode 5,
BSI, London (Publication date to be announced.)
Trang 8Standards 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 information for 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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