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IncorporatingN ational

Amendment N o.1

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Committees responsible for thisNational Annex

The preparation of this National Annex was entrusted by Committee B/525,

Building and civil engineering structures, to B/525/2, Structural use ofconcrete, upon which the following bodies were represented:

Association of Consulting Engineers

British Cement Association

British Precast Concrete Federation Ltd.

Building Research Establishment

Concrete Society

Department of Transport (Highways Agency)

Institution of Civil EngineersInstitution of Structural Engineers

Office of the Deputy Prime Minister

Scottish Building Standards Agency

UK Steel

Co-opted members

NA to BS EN 1992-1-1:2004

The following BSI referencesrelate to the work on thisNational Annex:Committee reference B/525/2Drafts for comment 05/3013400209/30180415

Amendments issued since publication

Amd. No. Date Comments

AMD 1 December 2009 See Introduction.

ISBN 978 0 580 62664 7

Summary of pages

This document comprises a front cover, an inside front cover, pages i, ablank page, pages 1 to 20, an inside back cover and a back cover.

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

This National Annex waspublished under the authorityof the Standards Policy andStrategy Committee on8 December 2005

© BSI 2009

First edition December 2005

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© BSI 2009

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Table deleted

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NA to BS EN 1992-1-1:2004 incorporating National Amendment No. 1 supersedes NA to BS EN 1992-1-1:2004,which is withdrawn.

The start and finish of text introduced or altered by National Amendment No. 1 is indicated in the textby tags !" . Minor editorial changes are not tagged.

National Amendment No. 1 has been made to reflect Corrigendum No. 1 to BS EN 1992-1-1:2004.

© BSI 2009

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! Tables deleted. "

© BSI 200916

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! In BS EN 1992-1-1:2004, Expression (7.11) the cover, c should be taken as c nom . The use of theresulting value of s r,max in BS EN 1992-1-1:2004, Expression (7.8) will then provide an estimation ofthe crack width at the surface of the concrete. In some situations, such as structures cast against the

ground,c

nom will be significantly greater than the cover required for durability. Where there are noappearance requirements it is reasonable to determine the crack width at the cover required fordurability and verify that it does not exceed the relevant maximum crack width.

This may be done by multiplying the crack width determined at the surface by ( c min,dur + ∆ c dev )/c nom togive the crack width at the cover required for durability, and verifying that it is not greater thanw max . This approach assumes the crack width varies linearly with zero width at the face of the bar. "

© BSI 2009 17n

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NOTE 5 When the span/depth ratio obtained from NA.3 or Expressions (7.16a) or (7.16b) is adjusted using either (310/ σ s) or(500/f yk )( A s,prov / A s,req ), such adjustment should be limited to a maximum value of 1.5. σ s should be calculated under characteristiccombination of load at serviceability limit state.NOTE 6 The absolute value of span/depth may not, in any case, exceed 40 K ."

© BSI 2009

! NOTE 4 The values of k in the table might not be appropriate when the form-work is struck at an early age or when theconstruction loads exceed the design load. In these cases, the deflections may need to be calculated using advice in specialistliterature, e.g. the Concrete Society’s report on deflecions in concrete slabs and beams and an article for the Magazine ofConcrete Research entitled Are existing span to depth rules conservative for flat slabs ?, both of which are referenced in NA.4 .

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! The Building Regulations 2000 (England and Wales) [1,2], Building (Scotland) Regulations 2004[3,4,5], and Building Regulations (Northern Ireland) 2000 [6] require that a building is constructed sothat in the event of an accident the building will not suffer collapse to an extent disproportionate tothe cause. Provisions of EN 1992-1-1 are not considered sufficient in some respects and details anddesign approaches for satisfying this requirement are included in PD 6687 as non-contradictorycomplimentary information. "

© BSI 2009

NA.4.2 References for conforming to building regulations in the UK

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! PD 6687-2:2008, Recommendations for the design of structures to BS EN 1992-2:2005 "

! [1] GREAT BRITAIN. The Building Regulations 2000. London: The Stationery Office.

[2] GREAT BRITAIN. The Building Regulations 2000 Approved Document A: Structure. London: TheStationery Office, 2004.

[3] GREAT BRITAIN. Building (Scotland) Regulations 2004, as amended: The Stationery Office.

[4] GREAT BRITAIN. The Scottish Building Standards Technical Handbook Domestic: The StationeryOffice.

[5] GREAT BRITAIN. The Scottish Building Standards Technical Handbook Non-Domestic: TheStationery Office.

[6] GREAT BRITAIN. Building Regulations (Northern Ireland) 2000. Belfast: The StationeryOffice. "

© BSI 200920

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