Bsi bs en 01991 1 2 2002 na 2007

Un
i
t
e
dKi
n
g
d
o
mo
fGr
e
a
t
Br
i
t
a
i
na
n
dNo
r
t
h
e
r
nI
r
e
l

a
n
d
≠ EDI
CTOFGOVERNMENT±
I
no
r
d
e
rt
op
r
o
mo
t
ep
u
b
l
i
ce
d
u
c
a
t
i
o
na

n
dp
u
b
l
i
cs
a
f
e
t
y
,e
q
u
a
lj
u
s
t
i
c
ef
o
r
a
l
l
,ab
e

t
t
e
ri
n
f
o
r
me
dc
i
t
i
z
e
n
r
y
,t
h
er
u
l
eo
fl
a
w,wo
r
l
dt

r
a
d
ea
n
dwo
r
l
d
p
e
a
c
e
,t
h
i
sl
e
g
a
ld
o
c
u
me
n
ti
sh
e

r
e
b
yma
d
ea
v
a
i
l
a
b
l
eo
nan
o
n
c
o
mme
r
c
i
a
l
b
a
s
i
s

,a
si
ti
st
h
er
i
g
h
to
fa
l
lh
u
ma
n
st
ok
n
o
wa
n
ds
p
e
a
kt
h
el
a

wst
h
a
t
g
o
v
e
r
nt
h
e
m.
BS NA EN 1991-1-2 (2002) (English): UK National
Annex to Eurocode 1. Actions on structures.
General actions. Actions on structures exposed to
fire

Nu
l
l
iv
e
n
d
e
mu
s
,n
u

l
l
in
e
g
a
b
i
mu
sa
u
td
i
f
f
e
r
e
mu
sRe
c
t
u
ma
u
tJu
s
t
i
c

i
a
m.
Wewi
l
ls
e
l
lt
on
oma
n
,wewi
l
ln
o
td
e
n
yo
rd
e
f
e
rt
oa
n
yma
ne
i

t
h
e
rJu
s
t
i
c
eo
rRi
g
h
t
.
MAGNACARTA(
1
2
97
)



NA to BS EN 1991-1-2:2002

NATIONAL ANNEX

UK National Annex to
Eurocode 1: Actions on
structures Part 1-2: General actions - Actions on
structures exposed to fire

ICS 13.220.50, 91.010.30, 91.080.01

British Standards
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW


NA to BS EN 1991-1-2:2002
Publishing and copyright information
The BSI copyright notice displayed in this document indicates when the
document was last issued.
© BSI 2007

ISBN 0 580 50603 1
The following BSI references relate to the work on this standard:
Committee reference B/525/1
Draft for comment 05/30128295

Publication history
First published April 2007

Amendments issued since publication
Amd. no.

Date

Text affected


NA to BS EN 1991-1-2:2002

Contents
Introduction 1
NA.l
NA.2
NA.3
NA.4

Scope 1
Nationally Determined Parameters 1
Decisions on the status of the informative annexes 3
Reference to non-contradictory complementary
information 4

Bibliography 5

Summary of pages
This document comprises a front cover, an inside front cover,
pages i and ii, pages 1 to 5 and a back cover.
â BSI 2007

ã


NA to BS EN 1991-1-2:2002

ii ã â BSI 2007

This page deliberately left blank

NA to BS EN 1991-1-2:2002

National Annex (inforlllative)
to BS EN 1991-1-2:2002,
Eurocode 1: Actions on
structures - Part 1-2: General
Actions - Actions on structures
exposed to fire
Introduction
This National Annex has been prepared by BSI Subconunittee B/525/1,
Actions (loadings) and basis of design. In the UK it is to be used in
conjunction with BS EN 1991-1-2:2002.

NA.l Scope
This National Annex gives:
a)

the UK decisions for the Nationally Determined Parameters
described in the following subclauses of BS EN 1991-1-2:2002:
2.4 (4)
3.1 (10)
•

3.3.1.2 (1)
3.3.1.3 (1)
3.3.2 (2)

•

4.2.2 (2)

4.3.1 (2)

b) the UK decisions on the status of BS EN 1991-1-2:2002
informative annexes.

NA.2 Nationally Determined Parameters
NA.2.1

Temperature analysis
[BS EN 1991-1-2:2002, 2.4 (4)]
BS EN 1991-1-2 recommends that temperature analysis is performed
using a nominal temperature-time curve or a fIre model.
When performing temperature analysis in terms of the nominal
temperature-time curve, the period of time within which to make the
temperature analysis is specifIed:
a)

for England and Wales in Approved Document B to the Building
Regulations 2000 [1];

b) for Scotland in the Scottish Building Standards Technical
Handbooks [2] and [3];
c)

for Northern Ireland in Technical Booklet E to the Building
Regulations (Northern Ireland) 2000 [4].
â BSI 2007

ã

1


NA to BS EN 1991-1-2:2002
When performing temperature analysis using fire models, no limited
periods of fire resistance are specified. Fire models used should be
soundly based, robust and suitable for the given fire design scenario.

NA.2.2

Thermal actions for temperature analysis
[BS EN 1991-1-2:2002, 3.1 (10)]
The use of the nominal temperature-time curves specified in
BS EN 1991-1-2:2002, 3.2 is permitted as appropriate to the
application.
NOTE The nominal time-temperature relationships are taken from the
furnace heating curves described in BS EN 1363-1 and BS EN 1363-2.

The use of the natural fire models specified in BS EN 1991-1-2:2002,
3.3 is permitted.

NA.2.3

Simplified fire models - Compartment fires
[BS EN 1991-1-2:2002, 3.3.1.2 (1)]
The heating conditions for determining the gas temperature of
compartment fires may be calculated in accordance with
BS EN 1991-1-2:2002, AnnexA or Annex B but only in conjunction with
the complementary information in PD 6688-1-2:2007, 3.2.

NA.2.4

Simplified fire models - Localised fires
[BS EN 1991-1-2:2002, 3.3.1.3 (1)]
The heating conditions for local fires may be calculated in accordance
with PD 6688-1-2:2007, 4.1. The use of BS EN 1991-1-2:2002,
Annex C is not permitted.

NA.2.5

Advanced fire models
[BS EN 1991-1-2:2002, 3.3.2 (2)]
The "one-zone, two-zone", "multi-zone" and "computational fluid
dynamic" advanced fire models described in BS EN 1991-1-2:2002,
3.3.2 (2) may be used.

NA.2.6

Simultaneity of actions - Additional actions
[BS EN 1991-1-2:2002, 4.2.2 (2)]
No additional actions need be considered.

NA.2.7

Combination rules for actions
[BS EN 1991-1-2:2002, 4.3.1 (2)]
The representative value of the variable action Q1 should be taken as the
frequent value ƠFl.l Ql'

2 ã â BSI 2007

NA to BS EN 1991-1-2:2002

NA.3 Decisions on the status of the
informative annexes
NA.3.1

Parametric temperature time curves
[BS EN 1991-1 .. 2:2002, Annex A]
This annex may be used but only in conjunction with the complementary
information in PD 6688-1-2:2007,3.1.1.

NA.3.2

Thermal actions for external members
[BS EN 1991-1-2:2002, Annex B]
This annex may be used but only in conjunction with the complementary
information in PD 6688-1-2:2007, 3.1.2.

NA.3.3

Localised fires [BS EN 1991-1-2:2002, Annex C]
This annex may not be used.
PD 6688-1-2:2007, 4.1 should be used as a replacement.

NA.3.4

Advanced fire models
[BS EN 1991 .. 1-2:2002, Annex D]

This annex may be used.
NOTE This annex introduces the concept of heat balance in compartment
fires and gives a very brief description of the fundamentals and
complexities behind each of the types offire nwdels ranging from single
zone models up to computationaljluid dynamic models. However, apart
from a statement on principles there is little in terms of calculations that
would enable an engineer to carry out any detailed analysis.

NA.3.5

Fire load densities
[BS EN 1991-1-2:2002, Annex E]
This annex may not be used.
PD 6688-1-2:2007, Amlex A should be used as a replacement.

NA.3.6

Equivalent time of fire exposure
[BS EN 1991-1-2:2002, Annex F]
This annex may not be used.
PD 6688-1-2:2007, Annex B should be used as a replacement.

NA.3.7

Configuration factor
[BS EN 1991-1-2:2002, Annex G]
This annex may be used.

© BSI 2007

•

3


NA to BS EN 1991-1-2:2002

NA.4 References to non-contradictory
complementary information
The following is a list of references that contain non-contradictory
complementary information for use with BS EN 1991-1-2:2002.
ã

4

ã

â BSI 2007

PD 6688-1-2.


NA to BS EN 1991-1-2:2002

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 1363-1, Fire resistance tests - General requirements

BS EN 1363-2, Fire resistance tests - Alternative and additional

procedures
PD 6688-1-2, Background paper to the UK National Annex to
BS EN 1991-1-2

Other publications
[ 1] TSO. The Building Regulations 2000 Approved Document B:
Fire Safety. London: TSO, 2006.
[2] SCOTTISH BUILDING STANDARDS AGENCY. The Scottish

Building Standards: Technical Handbook: Domestic.
Livingston: SBSA, 2006.
[3] SCOTTISH BUILDING STANDARDS AGENCY. The Scottish

Building Standards: Technical Handbook: Non-domestic.
Livingston: SBSA, 2006.
[4] DEPARTMENT OF FINANCE AND PERSONNEL NORTHERN
IRELAND. The Building Regulations (Northern

Ireland) 2000 - Technical Booklet E -Fire Safety.
London: TSO, 2005.

© BSI 2007

•

5

NA to BS EN 1991-1 .. 2:2002

BSI - British Standards Institution
BSI is the independent national body responsible for preparing British Standards.
It presents the UK view on standards in Europe and at the international level.
It is incorporated by Royal Charter.

Revisions
British Standards are updated by amendment or revision. Users of British Standards
should make sure that they possess the latest amendments or editions.
It is the constant aim of BSI to improve the quality of our products and services.
We would be grateful if anyone finding an inaccuracy or ambiguity while using this
British Standard would inform the Secretary of the technical committee responsible,
the identity of which can be found on the inside front cover.
Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400.

BSI offers members an individual updating service called PLUS which ensures that
subscribers automatically receive the latest editions of standards.

Buying standards
Orders for all BSI, international and foreign standards publications should be
addressed to Customer Services. Tel: +44 (0)2089969001.
Fax: +44 (0)20 8996 7001. Email: Standards are also
available from the BSI website at .
In response to orders for international standards, it is BSI policy to supply the BSI
implementation of those that have been published as British Standards, unless
otherwise requested.

Information on standards
BSI provides a wide range of information on national, European and international

standards through its Library and its Technical Help to Exporters Service. Various
BSI electronic information services are also available which give details on all its
products and services. Contact the Information Centre. Tel: +44 (0)20 8996 711l.
Fax: +44 (0)20 8996 7048. Email:
Subscribing members of BSI are kept up to date with standards developments and
receive substantial discounts on the purchase price of standards. For details of these
and other benefits contact Membership Administration. Tel: +44 (0)208996 7002.
Fax: +44 (0)20 8996 7001. Email:
Information regarding online access to British Standards via British Standards
Online can be found at />Further information about BSI is available on the BSI website at
.

Copyright

-...

~--......

-

•

Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of
the publications of the international standardization bodies. Except as permitted
under the Copyright, Designs and Patents Act 1988 no extract may be reproduced,
stored in a retrieval system or transmitted in any form or by any means electronic,
photocopying, recording or otherwise - without prior written permission from BSI.

British Standards

This does not preclude the free use, in the course of implementing the standard, of
necessary details such as sYlubols, 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.

389 Chiswick High Road
London
W44AL

Details and advice can be obtained from the Copyright & Licensing Manager.
Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553.
Email: