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BRITISH STANDARD BS EN 1998-42006 Eurocode 8 Design of structures for earthquake resistance Part 4 Silos, tanks and pipelines The European Standard EN 1998-42006 has the status of a British Standard ICS 91.120.25 Licensed Copy x x, University of Glamorgan, Sat Apr 28 154646 GMT0000 2007, Uncontrolled Copy, c BSI BS EN 1998-42006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006 ISBN 0 580 49272 9 National foreword This British Standard was published by BSI. It is the UK implementation of EN 1998-42006. It supersedes DD ENV 1998-41999 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee B/525, Building and civil engineering structures, to Subcommittee B/525/8, Structures in seismic regions. A list of organizations represented on B/525/8 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy x x, University of Glamorgan, Sat Apr 28 154646 GMT0000 2007, Uncontrolled Copy, c BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1998-4 July 2006 ICS 91.120.25Supersedes ENV 1998-41998 English Version Eurocode 8 - Design of structures for earthquake resistance - Part 4 Silos, tanks and pipelines Eurocode 8 - Calcul des structures pour leur rsistance aux sismes - Partie 4 Silos, rservoirs et canalisations Eurocode 8 - Auslegung von Bauwerken gegen Erdbeben - Teil 4 Silos, Tankbauwerke und Rohrleitungen This European Standard was approved by CEN on 15 May 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions English, French, German. A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre rue de Stassart, 36 B-1050 Brussels 2006 CENAll rights of exploitation in any and by any means reserved worldwide for CEN national Members. Ref. No. EN 1998-42006 E Licensed Copy x x, University of Glamorgan, Sat Apr 28 154646 GMT0000 2007, Uncontrolled Copy, c BSI EN 1998-42006 E Contents FOREWORD 1 GENERAL ........................................................................................................................................8 1.1 SCOPE........................................................................................................................................8 1.2 NORMATIVE REFERENCES..........................................................................................................9 1.2.1 General reference standards................................................................................................9 1.3 ASSUMPTIONS..........................................................................................................................10 1.4 DISTINCTION BETWEEN PRINCIPLES AND APPLICATIONS RULES...............................................10 1.5 TERMS AND DEFINITIONS.........................................................................................................10 1.5.1 General...............................................................................................................................10 1.5.2 Terms common to all Eurocodes........................................................................................10 1.5.3 Further terms used in EN 1998..........................................................................................10 1.5.4 Further terms used in EN 1998-4.......................................................................................10 1.6 SYMBOLS.................................................................................................................................10 1.7 S.I. UNITS................................................................................................................................11 2 GENERAL PRINCIPLES AND APPLICATION RULES.........................................................13 2.1 SAFETY REQUIREMENTS...........................................................................................................13 2.1.1 General...............................................................................................................................13 2.1.2 Ultimate limit state.............................................................................................................13 2.1.3 Damage limitation state .....................................................................................................14 2.1.4 Reliability differentiation ...................................................................................................15 2.1.5 System versus element reliability........................................................................................16 2.1.6 Conceptual design..............................................................................................................16 2.2 SEISMIC ACTION.......................................................................................................................17 2.3 ANALYSIS................................................................................................................................17 2.3.1 s of analysis............................................................................................................17 2.3.2 Interaction with the soil......................................................................................................18 2.3.3 Damping.............................................................................................................................19 2.3.3.1 Structural damping ..................................................................................................................19 2.3.3.2 Contents damping....................................................................................................................19 2.3.3.3 Foundation damping................................................................................................................19 2.3.3.4 Weighted damping...................................................................................................................19 2.4 BEHAVIOUR FACTORS..............................................................................................................19 2.5 SAFETY VERIFICATIONS...........................................................................................................20 2.5.1 General...............................................................................................................................20 2.5.2 Combinations of seismic action with other actions............................................................20 3 SPECIFIC PRINCIPLES AND APPLICATION RULES FOR SILOS....................................22 3.1 INTRODUCTION........................................................................................................................22 3.2 COMBINATION OF GROUND MOTION COMPONENTS..................................................................22 3.3 ANALYSIS OF SILOS..................................................................................................................23 3.4 BEHAVIOUR FACTORS..............................................................................................................25 3.5 VERIFICATIONS........................................................................................................................26 3.5.1 Damage limitation state .....................................................................................................26 3.5.2 Ultimate limit state.............................................................................................................26 3.5.2.1 Global stability........................................................................................................................26 3.5.2.2 Shell.........................................................................................................................................26 3.5.2.3 Anchors ...................................................................................................................................27 3.5.2.4 Foundations.............................................................................................................................27 4 SPECIFIC PRINCIPLES AND APPLICATION RULES FOR TANKS..................................28 4.1 COMPLIANCE CRITERIA............................................................................................................28 4.1.1 General...............................................................................................................................28 4.1.2 Damage limitation state .....................................................................................................28 4.1.3 Ultimate limit state.............................................................................................................28 4.2 COMBINATION OF GROUND MOTION COMPONENTS..................................................................29 2 Licensed Copy x x, University of Glamorgan, Sat Apr 28 154646 GMT0000 2007, Uncontrolled Copy, c BSI w w w . b z f x w . c o m EN 1998-42006 E 4.3 S OF ANALYSIS...........................................................................................................29 4.3.1 General...............................................................................................................................29 4.3.2 Hydrodynamic effects.........................................................................................................29 4.4 BEHAVIOUR FACTORS..............................................................................................................30 4.5 VERIFICATIONS........................................................................................................................31 4.5.1 Damage limitation state .....................................................................................................31 4.5.1.1 General....................................................................................................................................31 4.5.1.2 Shell.........................................................................................................................................31 4.5.1.3 Piping ......................................................................................................................................31 4.5.2 Ultimate limit state.............................................................................................................31 4.5.2.1 Stability ...................................................................................................................................31 4.5.2.2 Shell.........................................................................................................................................31 4.5.2.3 Piping ......................................................................................................................................32 4.5.2.4 Anchorages..............................................................................................................................32 4.5.2.5 Foundations.............................................................................................................................32 4.6 COMPLEMENTARY MEASURES..................................................................................................32 4.6.1 Bunding..............................................................................................................................32 4.6.2 Sloshing..............................................................................................................................33 4.6.3 Piping interaction...............................................................................................................33 5 SPECIFIC PRINCIPLES AND APPLICATION RULES FOR ABOVE-GROUND PIPELINES 34 5.1 GENERAL.................................................................................................................................34 5.2 SAFETY REQUIREMENTS...........................................................................................................34 5.2.1 Damage limitation state .....................................................................................................34 5.2.2 Ultimate limit state.............................................................................................................35 5.3 SEISMIC ACTION.......................................................................................................................35 5.3.1 General...............................................................................................................................35 5.3.2 Seismic action for inertia movements.................................................................................35 5.3.3 Differential movement........................................................................................................35 5.4 S OF ANALYSIS...........................................................................................................35 5.4.1 Modelling ...........................................................................................................................36 5.4.2 Analysis..............................................................................................................................36 5.5 BEHAVIOUR FACTORS..............................................................................................................36 5.6 VERIFICATIONS...................................................................................
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