Bsi bs en 01991 1 2 2002 na 2007

BS NA EN 1991 1 2 UK National Annex to Eurocode 1 Actions on structures General actions Actions on structures exposed to fire United Kingdom of Great Britain and Northern Ireland In order to promote p[.]

Uni t e d Ki ng do m o f Gr e at

I n or de r t o pr omot e publ i duc a i on a nd publ i a e y, qua l j us t c or

a l be t e nf or me d c t ze nr y, he ul e of a w, wor l d t a de nd wor l d

pe a e hi s l ga l doc ume nt s he r by ma de va i a bl e on a nonc omme r i l

ba s s s i s t he i ght of l huma ns o know a nd s pe a k t he a ws ha t gove r n t he m.

Nul l ve nde mus , nul l ne g ab i mus aut di f e e mus Re c um aut Jus t c am.

We wi l s l t no man, we wi l no t de ny o de f r t any man e t he r Jus t c r Ri g ht

MAGNA CARTA ( 297)

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

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

Scope 1

NA.l

NA.2

NA.3

NA.4

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

© BSI 2007 •

NA to BS EN 1991-1-2:2002

ii • © 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]

© BSI 2007 • 1

NA to BS EN 1991-1-2:2002

2 • © BSI 2007

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 Q 1 should be taken as the frequent value ¥Fl.l Ql'

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 of fire 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

4 • © BSI 2007

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

• 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

- ~

-•

British Standards

389 Chiswick High Road

London

W44AL

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: orders@bsi-global.com Standards are also available from the BSI website at http://www.bsi-global.com

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: info@bsi-global.com

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: membership@bsi-global.com

Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline

Further information about BSI is available on the BSI website at http://www.bsi-global.com

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 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

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