1、NA to BS EN 1998-6:2005UK National Annex to Eurocode 8: Design of structures for earthquake resistance Part 6: Towers, masts and chimneysICS 91.120.25NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWNATIONAL ANNEXLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008
2、07:08, Uncontrolled Copy, (c) BSIPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2008ISBN 978 0 580 55094 2The following BSI references relate to the work on this standard:Committee reference B/525/8Draft for co
3、mment 07/30129899DCPublication historyFirst published August 2008Amendments issued since publicationAmd. no. Date Text affectedNA to BS EN 1998-6:2005Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSI BSI 2008 iNA to BS EN 1998-6:2005ContentsIntroduct
4、ion 1NA.1 Scope 1NA.2 Nationally Determined Parameters 1NA.3 Decisions on the status of the informative annexes 3NA.4 References to non-contradictory complementary information 3Bibliography 4List of tablesTable NA.1 UK values for Nationally Determined Parameters described in BS EN 1998-6:2005 2Summa
5、ry of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSINA to BS EN 1998-6:2005ii BSI 2008 This page deliberately le
6、ft blankLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSI BSI 2008 1NA to BS EN 1998-6:2005National Annex (informative) to BS EN 1998-6:2005, Eurocode 8: Design of structures for earthquake resistance Part 6: Towers, masts and chimneysIntroductionThi
7、s National Annex has been prepared by BSI Subcommittee B/525/8, Structures in seismic regions. In the UK it is to be used in conjunction with BS EN 1998-6:2005.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS
8、 EN 1998-6:2005:3.1(1)3.5(2)4.1(5)P4.3.2.1(2)4.7.2(1)P4.9(4)b) the UK decisions on the status of BS EN 1998-6:2005 informative annexes;c) references to non-contradictory complementary information.NA.2 Nationally Determined ParametersUK decisions for the Nationally Determined Parameters described in
9、BS EN 1998-6:2005 are given in Table NA.1.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSI2BSI 2008NA to BS EN 1998-6:2005Table NA.1 UK values for Nationally Determined Parameters described in BS EN 1998-6:2005Subclause Nationally Determined Paramet
10、er Eurocode recommendation UK decision3.1(1) Conditions under which the rotational component of the ground motion should be taken into account.Structures taller than 80 m in regions where the product agS exceeds 0,25 gUse the recommended values.3.5(2) The lower bound factor “ on design spectral valu
11、es, if site-specific studies have been carried out with particular reference to the long period content of the seismic action.“ = 0,1 Use the recommended value.4.1(5)P Importance factors for masts, towers and chimneys.Class I: I=0,8Class III: I=1,2Class IV: I=1,4For CC3 facilities, where a value for
12、 the reference returnperiod TNCRof 2 500 years has been adopted, I=1 should be assumed. Where TNCRhas been assessed on a project-specific basis, Ishould also be chosen on a project-specific basis. Further guidance is given in PD 6698.4.3.2.1(2) Detailed conditions, supplementing those in BS EN 1998-
13、6:2005, 4.3.2.1(2), for the lateral force method of analysis to be applied.A total height, H, not greater than 60 m and an importanceclass I or IIThe lateral force method should not be used for consequence class CC3 facilities.4.7.2(1) P Partial factors for materials. None For steel, concrete, struc
14、tural steel and masonry, use the values of partial factors for the design of new buildings given in the UK NA to BS EN 1998-1.4.9(4) Reduction factor for displacements at damage limitation limit state.Class I & II: =0,4Class III & IV: =0,5In the absence of a project-specific assessment, adopt the re
15、commended values. Further guidance is given in PD 6698. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSI BSI 2008 3NA to BS EN 1998-6:2005NA.3 Decisions on the status of the informative annexesNA.3.1 Linear dynamic analysis accounting for rotational
16、 components of the ground motion BS EN 1998-6:2005, Annex ABS EN 1998-6:2005 informative Annex A may be used in the UK.NA.3.2 Modal damping in modal response spectrum analysis BS EN 1998-6:2005, Annex BBS EN 1998-6:2005 informative Annex B may be used in the UK.NA.3.3 Soil-structure interaction BS E
17、N 1998-6:2005, Annex CBS EN 1998-6:2005 informative Annex C may be used in the UK.NA.3.4 Number of degrees of freedom and of modes of vibration BS EN 1998-6:2005, Annex DBS EN 1998-6:2005 informative Annex D may be used in the UK.NA.3.5 Masonry chimneys BS EN 1998-6:2005, Annex EBS EN 1998-6:2005 in
18、formative Annex E may be used in the UK.NA.3.6 Electrical transmission towers BS EN 1998-6:2005, Annex FBS EN 1998-6:2005 informative Annex F may be used in the UK.NA.4 References to non-contradictory complementary informationThe following is a list of references that contain non-contradictory compl
19、ementary information for use with BS EN 1998-6:2005. PD 6698:2008, Background paper to the UK National Annexes to BS EN 1998-1, BS EN 1998-2, BS EN 1998-4, BS EN 1998-5 and BS EN 1998-6.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSINA to BS EN 199
20、8-6:20054 BSI 2008BibliographyStandards publicationsBS EN 1998-6:2005, Eurocode 8 Design of structures for earthquake resistance Part 6: Towers, masts and chimneysPD 6698:2008, Background paper to the UK National Annexes to BS EN 1998-1, BS EN 1998-2, BS EN 1998-4, BS EN 1998-5 and BS EN 1998-6Licen
21、sed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSIThis page deliberately left blankNA to BS EN 1998-6:2005Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSIBSI British Standards InstitutionBSI is the indepen
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31、rade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070 Email: NA to BS EN 1998-6:2005BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 07:08, Uncontrolled Copy, (c) BSI
