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NATIONAL ANNEX NA to BS EN 1992-1-22004 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 1992-1-22004 This National Annex was published under the authority of the Standards Policy and Strategy 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 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 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 Summary of pages This document comprises a front cover, an 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 标准分享网 w w w .b z f x w .c o m 免费下载 w w w . b z f x w . c o m NA to BS EN 1992-1-22004 BSI 8 December 2005 1 National Annex inative to BS EN 1992-1-22004, 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 1992-1-22004. NA.1 Scope This National Annex gives a the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1992-1-12004; 2.1.3 2 5.3.2 2 2.3 2P 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 1P 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 1992-1-22004 inative anns; c references to non-contradictory complementary ination. NA.2 Nationally Determined Parameters UK decisions for the Nationally Determined Parameters described in BS EN 1992-1-22004 are given in Table NA.1. NA.3 Decisions on the status of inative anns BS EN 1992-1-22004 inative Anns A, B, C, D and E may be used in the UK. NA.4 References to non-contradictory complementary ination The tabular s for the design of columns described in BS EN 1992-1-22004, 5.3 are limited to braced structures. Guidance on unbraced structures is given in PD 66872005, Clause 4. Bibliography PD 66872005, Background paper to the UK National Anns to BS EN 1992-1-1 and BS EN 1992-1-2. w w w . b z f x w . c o m NA to BS EN 1992-1-22004 2 BSI 8 December 2005 Table NA.1 UK decisions for Nationally Determined Paramters described in BS EN 1992-1-22004 SubclauseNationally Determined ParameterEurocode recommendationUK decision 2.1.3 2Values of 1 and 21 200 K 2 240 K Use the recommended values 2.3 2PPartial safety factor M,fi1,0 for both thermal and mechanical properties Use the recommended value 3.2.3 5Values for the parameters of the stress-strain relationship of reinforcing steel at elevated temperatures Class N Table 3.2a or Class X Table 3.2bClass N Table 3.2a 3.2.4 2Values 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 3.3Class A 3.3.3 1Value of thermal conductivity cLimits defined in 3.3.3 2The lower limit defined in 3.3.3 2 4.1 1PUse of advanced calculation s to satisfy 2.4.1 2P NoneProperly validated advanced calculation s may be used 4.5.1 2Value of moisture content k below which spalling is unlikely to occur 3 Use the recommended value 5.2 3Reference load level fi 0,7Use the recommended value 5.3.1 1Tabulated data for unbraced structuresNoneNone 5.3.2 2Value of emax0,15h or bUse the recommended value 5.6.1 1Web thicknessClass WA, WB or WCWA 5.7.3 2Additional rules on rotation capacity at supports for continuous solid slabs NoneNone 6.1 5Reduction 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 be used. However, alternative values may be used but only if satisfactory test evidence is available. 6.2 2s to control spalling of high strength concretes s A to DAny of the s A to D or a combination of the s may be used 6.3 1Value of thermal conductivity for high strength concrete Limits given in 3.3.3 2The upper limit defined in 3.3.3 2 6.4.2.1 3Value 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 2Value of factor kmkm values given in Table 6.2NUse the recommended values 标准分享网 w w w .b z f x w .c o m 免费下载 w w w . b z f x w . c o m blank w w w . b z f x w . c o m NA to BS EN 1992-1-22004 BSI 389 Chiswick High Road London W4 4AL 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. 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