BS PD 6688-1-2-2007 Background paper to the UK National Annex to BS EN 1991-1-2《BS EN 1991-1-2的英国国家附录的背景文件》.pdf
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1、PD 6688-1-2:2007 Background paper to the UK National Annex to BS EN 1991-1-2 ICS 13.220.50, 91.010.30, 91.080.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW PUBLISHED DOCUMENT Incorporating Corrigendum No. 1Publishing and copyright information The BSI copyright notice disp
2、layed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 50604 8 The following BSI references relate to the work on this standard: Committee reference B/525/1 Publication history First published April 2007 Amendments issued since publication Amd. no. Date Text affe
3、cted 17225 Corrigendum No. 1 29 June 2007 ISBN corrected PD 6688-1-2:2007 BSI 2007 i PD 6688-1-2:2007 Contents Foreword ii 1 Scope 1 2 Combination rules for mechanical actions for structural analysis BS EN 1991-1-2:2002, 4.3.1 (2) 1 3 Guidance on BS EN 1991-1-2 informative annexes 3 4 UK replacement
4、s for BS EN 1991-1-2 informative annexes 6 Annexes Annex A (informative) Fire load densities (BS EN 1991-1-2:2002, Annex E) 7 Annex B (informative) Equivalent time of fire exposure (BS EN 1991-1-2:2002, Annex F) 13 Bibliography 16 List of figures Figure 1 Comparison between calculated and measured r
5、esponse for a low fire load 4 Figure 2 Comparison between calculated and measured response for a high fire load 4 List of tables Table 1 Summary of values for given in BS EN 1990:2002, Table NA.A1.1 2 Table 2 Loads to apply in the fire limit state in addition to the permanent actions for leading var
6、iable action 1or 23 Table A.1 Net calorific values H uof combustible materials for calculation of fire loads 9 Table A.2 Fire load densities q f,kfor different occupancies 11 Table A.3 Fire growth rate parameters 12 Table A.4 Design fire growth rates 12 Table A.5 Heat release rate per unit area of f
7、ire for different occupancies 13 Table B.1 Conversion factor k bdepending on the thermal properties of the enclosure 14 Table B.2 Height associated with multiplication risk factors 15 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16, an ins
8、ide back cover and a back cover.PD 6688-1-2:2007 ii BSI 2007 Foreword Publishing information This Published Document has been prepared by BSI Subcommittee B/525/1. This Published Document is published by BSI and came into effect on 30 April 2007. It was prepared by Subcommittee B/525/1, Actions (loa
9、dings) and basis of design, under the authority of Technical Committee B/525, Building and civil engineering structures. A list of organizations represented on this committee can be obtained on request to its secretary. Relationship with other publications This Published Document is a background pap
10、er that gives non-contradictory complementary information for use in the UK with BS EN 1991-1-2 and its UK National Annex. Use of this document As a guide, this Published Document takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular car
11、e should be taken to ensure that claims of compliance are not misleading. Any user claiming compliance with this Published Document is expected to be able to justify any course of action that deviates from its recommendations. Presentational conventions The provisions in this document are presented
12、in roman (i.e. upright) type. Its recommendations are expressed in sentences in which the principal auxiliary verb is “should”. Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element. The word “should” is used to expr
13、ess recommendations of this document. The word “may” is used in the text to express permissibility, e.g. as an alternative to the primary recommendation of the clause. The word “can” is used to express possibility, e.g. a consequence of an action or an event. Notes and commentaries are provided thro
14、ughout the text of this document. Notes give references and additional information that are important but do not form part of the recommendations. Commentaries give background information. Contractual and legal considerations This publication does not purport to include all the necessary provisions
15、of a contract. Users are responsible for its correct application. Compliance with a Published Document cannot confer immunity from legal obligations. BSI 2007 1 PD 6688-1-2:2007 Introduction When there is a need for guidance on a subject that is not covered by the Eurocode, a country can choose to p
16、ublish documents that contain non-contradictory complementary information that supports the Eurocode. This Published Document provides just such information and has been cited as a reference in the UK National Annex to BS EN 1991-1-2. 1 Scope This Published Document is a background paper that gives
17、non-contradictory complementary information for use in the UK with BS EN 1991-1-2 and its UK National Annex. This Published Document gives non-contradictory complementary information on: a) background to the decision made in NA to BS EN 1991-1-2 for combination rules for mechanical actions for struc
18、tural analysis; b) guidance on BS EN 1991-1-2:2002, Annex A and Annex B; and c) replacements for informative annexes BS EN 1991-1-2:2002, Annex C, Annex E and Annex F . 2 actions for structural analysis BS EN 1991-1-2:2002, 4.3.1 (2) NA to BS EN 1991-1-2 recommends that the representative value of t
19、he variable action Q Lshould be taken as the frequent value 1.L Q L , for certain situations as described in 2f). The reason for this is given by the following. a) Based on BS EN 1990:2002, 6.4.3.3 equation 6.11b simplifies to the combination of actions for accidental design situations as: G + A + 1
20、 or 2,L Q L+ 2,i Q i where G is the permanent action; A is the accidental action (which may involve an explicit action or refer to the situation after an accidental event such that A = 0); Q Lis the leading variable action (i.e. that which has the largest effect); Q iare other variable actions which
21、 can be imposed, snow or wind loads; 1is the frequent combination factor; 2is the quasi-permanent combination factor. b) In the case of fire, the accidental action A results in increased temperatures and hence reduced resistances of structural members such that A = 0 after the accidental event. Comb
22、ination rules for mechanical PD 6688-1-2:2007 2 BSI 2007 c) BS EN 1991-1-2:2002, 4.3.1 (2) allows the use of 1or 2in the accidental design situation for fire. d) The values for given in NA to BS EN 1990:2002, Table NA.A1.1 for buildings are summarized in Table 1. e) Based on a comparison with existi
23、ng UK practice, two cases related to the following ultimate limit states from BS EN 1990:2002, 6.4.1 have been identified in g). 1) EQU: Loss of static equilibrium of the structure or any part of it considered as a rigid body, where minor variations in the value or the spatial distribution of action
24、s from a single source are significant, and the strengths of construction materials or ground are generally not governing. 2) STR: Internal failure or excessive deformation of the structure or structural members, including footings, piles, basement walls, etc., where the strength of construction mat
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