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1、NATIONAL ANNEX NA to BS EN 1992-1-2:2004 UK National Annex to Eurocode 2: Design of concrete structures Part 1-2: General rules Structural fire design ICS 13.220.50; 91.010.30; 91.080.40 NA to BS EN 1992-1-2:2004 This National Annex was published under the authority of the Standards Policy and Strat
2、egy Committee on 8 December 2005 BSI 8 December 2005 First edition December 2005 The following BSI references relate to the work on this National Annex: Committee reference B/525/2 Draft for comment 05/30134001 ISBN 0 580 47245 0 Committees responsible for this National Annex The preparation of this
3、 National Annex was entrusted by Committee B/525, Building and civil engineering structures, to B/525/2, Structral use of concrete, upon which the following bodies were represented: Association of Consulting Engineers British Cement Association British Precast Concrete Federation Ltd. Building Resea
4、rch 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 Summary of pages This document comprises a front cover, an
5、inside front cover, pages 1 and 2, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments NA to BS EN 1992-1-2:2004 BSI 8 December 2005 1 National Annex (informat
6、ive) to BS EN 1992-1-2:2004, Eurocode 2: Design of concrete structures Part 1-2: General rules Structural fire design 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 S
7、cope 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
8、.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. N
9、A.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
10、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. Table NA.1 UK decisions for Nationally Determined Paramters described in BS EN 1992-1-2:2004 SubclauseNationall
11、y Determined ParameterEurocode recommendationUK decision 2.1.3 (2)Values of 1 and 21 = 200 K 2 = 240 K Use the recommended values 2.3 (2)PPartial safety factor M,fi1,0 for both thermal and mechanical properties Use the recommended value 3.2.3 (5)Values for the parameters of the stress-strain relatio
12、nship of reinforcing steel at elevated temperatures Class N (Table 3.2a) or Class X (Table 3.2b)Class N (Table 3.2a) 3.2.4 (2)Values for the parameters of the stress-strain relationship of cold worked (wires and strands) prestressing steel at elevated temperatures Class A or Class B in Table 3.3Clas
13、s A 3.3.3 (1)Value of thermal conductivity cLimits defined in 3.3.3 (2)The lower limit defined in 3.3.3 (2) 4.1 (1)PUse of advanced calculation methods to satisfy 2.4.1 (2)P NoneProperly validated advanced calculation methods may be used 4.5.1 (2)Value of moisture content k % below which spalling is
14、 unlikely to occur 3 %Use the recommended value 5.2 (3)Reference load level fi 0,7Use the recommended value 5.3.1 (1)Tabulated data for unbraced structuresNoneNone 5.3.2 (2)Value of emax0,15h (or b)Use the recommended value 5.6.1 (1)Web thicknessClass WA, WB or WCWA 5.7.3 (2)Additional rules on rota
15、tion capacity at supports for continuous solid slabs NoneNone 6.1 (5)Reduction of strength at elevated temperature for high strength concretes For C55/67 and C60/75: Class 1 of Table 6.1N For C70/85 and C80/95: Class 2 of Table 6.1N For C90/105: Class 3 of Table 6.1N The recommended classes should b
16、e used. However, alternative values may be used but only if satisfactory test evidence is available. 6.2 (2)Methods to control spalling of high strength concretes Methods A to DAny of the Methods A to D or a combination of the methods may be used 6.3 (1)Value of thermal conductivity for high strengt
17、h concrete Limits given in 3.3.3 (2)The upper limit defined in 3.3.3 (2) 6.4.2.1 (3)Value of factor k1,1 for Class 1 of Table 6.1N 1,3 for Class 2 of Table 6.1N Use the recommended values 6.4.2.2 (2)Value of factor kmkm values given in Table 6.2NUse the recommended values blank NA to BS EN 1992-1-2:
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