Incorporating
National
Amendment No.1
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Incorporating
National
Amendment No.1
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Committees responsible for this
National Annex
The preparation of this National Annex was entrusted by Committee B/525,
Building and civil engineering structures, to B/525/2, Structural use of
concrete, 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 Engineers
Institution 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 references
relate to the work on this
National Annex:
Committee reference B/525/2
Drafts for comment 05/30134002
09/30180415
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, a
blank page, pages 1 to 20, an inside back cover and a back cover.
The BSI copyright notice displayed in this document indicates when
the document was last issued.
This National Annex was
published under the authority
of the Standards Policy and
Strategy Committee on
8 December 2005
© BSI 2009
First edition December 2005
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© BSI 2009
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which is withdrawn.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 text
by 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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¼
¼
¼
¼
¼
¼
¼
¼
¼
³
³
³
º
º
Eurocode
A)
recommendation
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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º
º
º
#
¼
#
#
#
#
Eurocode
A)
recommendation
!
Use BS 8500-1:2006, Tables A.5 and A.11 for
recommendations for concrete quality for a particular exposure class and cover reinforcement
c.
"
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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¼
¼
¼
¼
¼
¼
¼
¼
¼
¼
¼
¼
Ø
Eurocode
A)
recommendation
!
Use the recommended values
"
In
option c), when analysis is carried out using the load
arrangement described in b)1), the resulting support moments except those at the supports of cantilevers should be reduced by 20%, with a consequential increase
in the span moments.
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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º
º
N
º
N
Ø
Ä
Ä
µ
µ
µ
¼
Eurocode
A)
recommendation
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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#Ô
´
#Ô
´
8
´
N
´
¼
#
¼
#
¼
#
¼
#
¼
ÇÇ
Ø
N
Ø
N
N
Ø
N
Ø
Eurocode
A)
recommendation
!
1,25
"
.
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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Ç
³
Ç
Ç
³
Ç
Ç
³
N
Ç
³
8
³
Ô
Ô
N
Ô
N
Ô
Ô
Ô
Ô
Ø
Ç
³
Ô
³
Eurocode
A)
recommendation
!
ν
1
=ν
(1
−
0,5cos
α
)"
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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Ø
N
Ø
N
N
Ø
N
´´
´
´
¼
Ç
Ç
¼
¼
Eurocode
A)
recommendation
!
ν
Rd,max
=0,5
νf
cd
In addition,
ν
Ed
should be limited to 2
ν
Rd
c
at the first
control perimeter
"
Unless the perimeter at which reinforcement is no longer
required is less than 3
d
from the face of the loaded area/
column. In this case the reinforcement should be placed
in the zone 0,3
d
and 1,5
d
from the face of the loaded
area/column. The first perimeter of reinforcement should
be no further than 0,5
d
from the face of the loaded area/
column.
"
© BSI 2009
!
k=1,5
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
ν
Rd,max
=0,5
νf
cd
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Ô
Ê
Ê
Ô
N
Ê
Ê
8
Eurocode
A)
recommendation
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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´
´
´
´
Ò
³
³
N
N
N
N
N
Ê
Ê
Eurocode
A)
recommendation
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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Eurocode
A)
recommendation
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008)."
!Use the recommended value for concrete class
≤ C50/60.
For concrete class > C50/60, transverse reinforcement
should satisfy the following:
α
n
α
s
ω
wd
≥ 0,04, in which
ω
wd
=
(Volume of confining hoops × f
yd
/volume of concrete
× f
cd
)
For rectangular columns:
α
n
= 1
− Σ(b
i
2
/6) b
0
h
0
α
s
= [1
− (s/2b
0
)] [1
− (s/2h
0
)]
where:
n is the number of longitudinal bars laterally restrained
by links or ties
b
i
is the distance between consecutive bars that are
laterally restrained
s is the longitudinal spacing of links
b
0
and h
0
are the widths of confinement in the two
directions (dimension to the centre of links).
For circular columns with circular links:
α
n
= 1
α
s
= (1 – s/2D
0
)
2
For circular columns with spiral links
α
n
= 1
α
s
= (1 – s/2D
0
)
where D
0
is the diameter of the confined core (to the
centre line of links)."
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Ê
Ê
Eurocode
A)
recommendation
!
Values of
A
c
and
A
s,bpmin
A
c
from Table 9.6N
"
!
Q
2
Q
2
Q
2
q
1
=(20+4
n
0
)l
i
where
n
0
is the number of storeys and
l
i
is
the length of the end span
"
Ê
Ê
Ê
© BSI 2009
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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N
³
³
Eurocode
A)
recommendation
PD 6687 gives additional requirements related to the building regulations in the UK.
8
N
© BSI 2009
8
N
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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»
¼
»
¼
´
´
º
º
º
Eurocode
A)
recommendation
³
³
³
³
³
¼
¼
¼
¼
¼
¼
¼
© BSI 2009
¼
Ç
Ç
»
!
υ
l,min
=
0,28
k
3/2
f
lck
1/2
Use the recommended values
"
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
!
ν
l
= 0,5
η
1
[1
−
f
lck
/250] generally for lightweight
concrete, except in Expression (11.6.5), when the recommended value may be used. For lightweight concrete,
ν
l
should not be modified in
accordance with Note 2 of
6.2.3
(3).
"
!
α
ct,pl
= 0,8
"
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© BSI 2009
Ø
N
Ø
N
Eurocode
A)
recommendation
!
A)
Table NA.1 relates to BS EN 1992-1-1 incorporating Corrigendum No. 1 (January 2008).
"
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!
Tables deleted."
© BSI 2009
16
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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 the
resulting value of s
r,max
in BS EN 1992-1-1:2004, Expression (7.8) will then provide an estimation of
the 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 no
appearance requirements it is reasonable to determine the crack width at the cover required for
durability 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
to
give the crack width at the cover required for durability, and verifying that it is not greater than
w
max
. This approach assumes the crack width varies linearly with zero width at the face of the bar."
© BSI 2009
17
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Ò
Ò
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 characteristic
combination of load at serviceability limit state.
NOTE 6 The absolute value of span/depth may not, in any case, exceed 40K."
© 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 the
construction loads exceed the design load. In these cases, the deflections may need to be calculated using advice in specialist
literature, e.g. the Concrete Society’s report on deflecions in concrete slabs and beams and an article for the Magazine of
Concrete Research entitled Are existing span to depth rules conservative for flat slabs?, both of which are referenced in NA.4.
18
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Ê
Ê
N
Ê
Ê
Ê
Ê
N Ê
Ê
Ê
Ê Ê N
Ê Ê N
!
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 so
that in the event of an accident the building will not suffer collapse to an extent disproportionate to
the cause. Provisions of EN 1992-1-1 are not considered sufficient in some respects and details and
design approaches for satisfying this requirement are included in PD 6687 as non-contradictory
complimentary information."
© BSI 2009
NA.4.2 References for conforming to building regulations in the UK
19
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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: The
Stationery 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 Stationery
Office.
[5] GREAT BRITAIN. The Scottish Building Standards Technical Handbook Non-Domestic: The
Stationery Office.
[6] GREAT BRITAIN. Building Regulations (Northern Ireland) 2000. Belfast: The Stationery
Office."
© BSI 2009
20
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