National Annex To BS en 1992-1-2 (2004)
National Annex To BS en 1992-1-2 (2004)
National Annex To BS en 1992-1-2 (2004)
1992-1-2:2004
Licensed Copy: na na, Imperial College of Science and Technology (JISC), Sat Oct 28 08:29:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
UK National Annex to
Eurocode 2: Design of
concrete structures —
Part 1-2: General rules — Structural fire
design
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NA to BS EN 1992-1-2:2004
Licensed Copy: na na, Imperial College of Science and Technology (JISC), Sat Oct 28 08:29:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
Introduction
This National Annex has been prepared by BSI Subcommittee B/525/2, Structural use of concrete. In the
UK it is to be used in conjunction with BS EN 1992-1-2:2004.
NA.1 Scope
This National Annex gives:
a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of
BS EN 1992-1-1:2004;
— 2.1.3 (2) — 5.3.2 (2)
— 2.3 (2)P — 5.6.1 (1)
— 3.2.3 (5) — 5.7.3 (2)
— 3.2.4 (2) — 6.1 (5)
— 3.3.3 (1) — 6.2 (2)
— 4.1 (1)P — 6.3 (1)
— 4.5.1 (2) — 6.4.2.1 (3)
— 5.2 (3) — 6.4.2.2 (2)
b) the UK decisions on the status of BS EN 1992-1-2:2004 informative annexes;
c) references to non-contradictory complementary information.
NA.2 Nationally Determined Parameters
UK decisions for the Nationally Determined Parameters described in BS EN 1992-1-2:2004 are given in
Table NA.1.
NA.3 Decisions on the status of informative annexes
BS EN 1992-1-2:2004 informative Annexes A, B, C, D and E may be used in the UK.
NA.4 References to non-contradictory complementary information
The tabular methods for the design of columns described in BS EN 1992-1-2:2004, 5.3 are limited to braced
structures. Guidance on unbraced structures is given in PD 6687:2005, Clause 4.
Bibliography
PD 6687:2005, Background paper to the UK National Annexes to BS EN 1992-1-1 and BS EN 1992-1-2.
2
Table NA.1 — UK decisions for Nationally Determined Paramters described in BS EN 1992-1-2:2004
Subclause Nationally Determined Parameter Eurocode recommendation UK decision
2.1.3 (2) Values of %Ú1 and %Ú2 %Ú1 = 200 K Use the recommended values
%Ú2 = 240 K
2.3 (2)P Partial safety factor ¾M,fi 1,0 for both thermal and mechanical Use the recommended value
properties
3.2.3 (5) Values for the parameters of the Class N (Table 3.2a) or Class X (Table 3.2b) Class N (Table 3.2a)
stress-strain relationship of reinforcing
steel at elevated temperatures
3.2.4 (2) Values for the parameters of the Class A or Class B in Table 3.3 Class A
stress-strain relationship of cold worked
(wires and strands) prestressing steel at
NA to BS EN 1992-1-2:2004
elevated temperatures
3.3.3 (1) Value of thermal conductivity Æc Limits defined in 3.3.3 (2) The lower limit defined in 3.3.3 (2)
4.1 (1)P Use of advanced calculation methods to None Properly validated advanced
satisfy 2.4.1 (2)P calculation methods may be used
4.5.1 (2) Value of moisture content k % below which 3 % Use the recommended value
spalling is unlikely to occur
5.2 (3) Reference load level ½fi 0,7 Use the recommended value
5.3.1 (1) Tabulated data for unbraced structures None None
5.3.2 (2) Value of emax 0,15h (or b) Use the recommended value
5.6.1 (1) Web thickness Class WA, WB or WC WA
5.7.3 (2) Additional rules on rotation capacity at None None
supports for continuous solid slabs
6.1 (5) Reduction of strength at elevated For C55/67 and C60/75: Class 1 of Table 6.1N The recommended classes should be
temperature for high strength concretes For C70/85 and C80/95: Class 2 of Table 6.1N used. However, alternative values may
For C90/105: Class 3 of Table 6.1N be used but only if satisfactory test
evidence is available.
6.2 (2) Methods to control spalling of high strength Methods A to D Any of the Methods A to D or a
concretes combination of the methods may be used
6.3 (1) Value of thermal conductivity for high Limits given in 3.3.3 (2) The upper limit defined in 3.3.3 (2)
strength concrete
6.4.2.1 (3) Value of factor k 1,1 for Class 1 of Table 6.1N Use the recommended values
1,3 for Class 2 of Table 6.1N
6.4.2.2 (2) Value of factor km km values given in Table 6.2N Use the recommended values
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NA to BS EN
1992-1-2:2004
Licensed Copy: na na, Imperial College of Science and Technology (JISC), Sat Oct 28 08:29:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
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