1、NA to BS EN 1998-4:2006UK National Annex to Eurocode 8: Design of structures for earthquake resistance Part 4: Silos, tanks and pipelinesICS 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、03:10, 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 55092 8The following BSI references relate to the work on this standard:Committee reference B/525/8Draft for co
3、mment 07/30129894DCPublication historyFirst published August 2008Amendments issued since publicationAmd. no. Date Text affectedNA to BS EN 1998-4:2006Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSI BSI 2008 iNA to BS EN 1998-4:2006ContentsIntroduct
4、ion 1NA.1 Scope 1NA.2 Nationally Determined Parameters 1NA.3 Decisions on the status of the informative annexes 3NA.4 Reference to non-contradictory complementary information 3Bibliography 4List of tablesTable NA.1 UK values for Nationally Determined Parameters described in BS EN 1998-4:2006 2Summar
5、y 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 03:10, Uncontrolled Copy, (c) BSINA to BS EN 1998-4:2006ii BSI 2008 This page deliberately lef
6、t blankLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSI BSI 2008 1NA to BS EN 1998-4:2006National Annex (informative) to BS EN 1998-4:2006, Eurocode 8: Design of structures for earthquake resistance Part 4: Silos, tanks and pipelinesIntroductionThis
7、 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 1998-4:2006.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS
8、EN 1998-4:2006:b) the UK decisions on the status of BS EN 1998-4:2006 informative annexes;c) references to non-contradictory complementary information.NA.2 Nationally Determined ParametersUK decisions for the Nationally Determined Parameters described in BS EN 1998-4:2006 are given in Table NA.1.1.1
9、(4)2.1.2(4)P2.1.3(5)P2.1.4(8)2.2(3)2.3.3.3(2)P2.5.2(3)P3.1(2)P4.5.1.3(3)4.5.2.3(2)PLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSI2BSI 2008NA to BS EN 1998-4:2006Table NA.1 UK values for Nationally Determined Parameters described in BS EN 1998-4:20
10、06Subclause Nationally Determined Parameter Eurocode recommendation UK decision1.1(4) Additional requirements for facilities associated with large risks to the population or the environment.None A site-specific hazard analysis should be performed.2.1.2(4)P Reference return period TNCRof seismic acti
11、on for the ultimate limit state (or, equivalently, reference probability of exceedence in 50 years, PNCR).TNCR= 475 years In the absence of a site-specific assessment, adopt a return period TNCRof 2 500 years. Further guidance is given in PD 6698.2.1.3(5)P Reference return period TDLRof seismic acti
12、on for the damage limitation state (or, equivalently, reference probability of exceedence in 10 years, PDLR).TDLR= 95 yearsPDLR= 10%In the absence of a project-specific assessment, adopt the recommended values. Further guidance is given in PD 6698.2.1.4(8) Importance factors for silos, tanks and pip
13、elines. Class I: I=0,8Class III: I=1,2Class IV: I=1,6Where a value for the reference return period TNCRof 2 500 years has been adopted for CC3 structures, I=1 should be assumed. Where TNCRhas been assessed on a project-specific basis, Ishould also be chosen on a project-specific basis. Further guida
14、nce is given in PD 6698.2.2(3) Reduction factor for the effects of the seismic action relevant to the damage limitation state.Class I & II: =0,4Class III & IV: =0,5In the absence of a project-specific assessment, adopt the recommended values. Further guidance is given in PD 6698.2.3.3.3(2)P Maximum
15、value of radiation damping for soil structure interaction analysis, Kmax.max= 25% Use the recommended value.2.5.2(3)P Ratio of coefficient Eion variable mass used in seismic analysis to combination coefficient 2,ifor quasi permanent values of variable actions for silos, tanks and pipelines. = 0 for
16、empty silo, tank or pipeline = 1 for full silo, tank or pipelineUse the recommended values.3.1(2)P Unit weight of the particulate solid in silos, , in the seismic design situation. = u, upper bound characteristic value of unit weight from BS EN 1991-4: 2006, Table E1Use the recommended value.4.5.1.3
17、(3) Amplification factor p1on forces transmitted by the piping to region of attachment on the tank wall, for the design of the region to remain elastic in the damage limitation state.p1= 1,3 Use the recommended value.4.5.2.3(2)P Overstrength factor p2 on design resistance of piping in the verificati
18、on that the connection of the piping to the tank will not yield prior to the piping in the ultimate limit state.p2= 1,3 Use the recommended value.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSI BSI 2008 3NA to BS EN 1998-4:2006NA.3 Decisions on the
19、 status of the informative annexesNA.3.1 Seismic analysis procedures for tanks BS EN 1998-4:2006, Annex ABS EN 1998-4:2006 informative Annex A may be used in the UK.NA.3.2 Buried pipelines BS EN 1998-4:2006, Annex BBS EN 1998-4:2006 informative Annex B may be used in the UK.NA.4 References to non-co
20、ntradictory complementary informationThe following is a list of references that contain non-contradictory complementary information for use with BS EN 1998-4:2006. 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.Lic
21、ensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSINA to BS EN 1998-4:20064 BSI 2008BibliographyStandards publicationsBS EN 1991-4:2006, Eurocode 1 Actions on structures Part 4: Silos and tanksBS EN 1998-4:2006, Eurocode 8 Design of structures for earthqu
22、ake resistance Part 4: Silos, tanks and pipelinesPD 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 1998-6Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSIThis page deliberate
23、ly left blankNA to BS EN 1998-4:2006Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 31/10/2008 03:10, Uncontrolled Copy, (c) BSIBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and
24、 at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and s
25、ervices. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400BSI offers me
26、mbers an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001 Fax: +44 (0)2
27、0 8996 7001 Email: You may also buy directly using a debit/credit card from the BSI Shop on theWebsite http:/ response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested.Informati
28、on on standardsBSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the I
29、nformation Centre. Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:
30、 +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: Information regarding online access to British Standards via British Standards Online can be found at http:/ information about BSI is available on the BSI website at http:/.CopyrightCopyright subsists in all BSI publications. BSI also holds the co
31、pyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or othe
32、rwise without prior written permission from BSI.This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior writte
33、n 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 1998-4:2006BSI 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 03:10, Uncontrolled Copy, (c) BSI
