EN 1998-1: Eurocode 8: Design of structures for earthquake ...

1 The European UnionIn order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. EDICT OF GOVERNMENT EN 1998-1 (2004) (English): Eurocode 8: Design of structuresfor earthquake resistance Part 1: General rules, seismicactions and rules for buildings [Authority: The EuropeanUnion Per Regulation 305/2011, Directive 98/34/EC, Directive2004/18/EC]EUROPEAN STANDARD NORME EUROPEENNE EUROpAISCHE NORM EN 1998-1 December 2004 ICS Supersedes ENV 1998-1-1:1994, ENV 1998-1-2:1994, ENV 1998-1-3:1995 Incorporating corrigendum July 2009 English version Eurocode 8: Design of structures for earthquake resistance -Part 1 : General rules, seismic actions and rules for buildings Eurocode 8: Cal cui des structures pour leur resistance aux seismes - Partie 1.

2 Regles generales, actions sismiques et regles pour les batiments Eurocode 8: Auslegung von Bauwerken gegen Erdbeben -Teil 1: Grundlagen, Erdbebeneinwirkungen und Regeln fUr Hochbauten This European Standard was approved by CEN on 23 April 2004. 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.

3 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NOR1'vlALISATION KOMITEE FUR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of explOitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1998-1: 2004: E BS EN 1998-1 :2004 EN 1998-1 :2004 (E) Contents Page FORE\VORD .. 8 CENERAL .. 15 ] ] SCOPE.

4 15 Scope of EN 1998 .. 15 Scope of EN 1998-1 .. 15 Further Parts of EN I 998 .. 16 N()RMA TIVE .REFERENCES .. 16 General reference standards .. 16 Reterence Codes and Standards .. 17 i\SSUMPTIONS .. 17 DISTINCTION BETWEEN PRINCIPLES AND APPLICATION RULES .. 17 TERfV1S AND DEFINITIONS .. 17 Terms C01111110n to all Eurocodes .. 17 Further terms llsed in EN 1998 .. 17 SYMBOLS .. 19 General .. 19 F ur1her symbols used in Sections 2 and 3 of EN 1998-1 .. 19 Further symbols lIsed in Section 4 of EN 1998-1 .. 20 Further symbols used in Section 5 of EN 1998-1 .. 21 Further symbols lIsed in Section 6 of EN 1998-J .. 24 Further used in Section 7 of EN 1998-1 .. 25 Further symbols lIsed in Section 8 of EN 1998-].

5 27 Further symbols Llsed in Section 9 of EN 1998-1 .. 27 Further symbols used in Section 10 of EN 1998-1 .. 28 UNITS .. 28 2 PERFORMANCE REQUIRElVIENTS AND COlV1 PLfANCE CRITERIA .. 29 FUNDAMENTAL REqUiREMENTS .. 29 COl\1 PLIANCE CRITERIA .. 30 General .. 30 Ultilnate lilnit state .. 30 Damage limitation state .. 31 Specific IneaSLlres .. 32 Design .. 32 Foundations .. 32 Quality system 32 3 CROUND CONDITIONS AND SEISMIC ACTION .. 33 GROUND CONDITIONS .. 33 3. J .2 Identification of ground 33 SEIS~1IC ACTION .. 35 Seisnlic zones .. 35 Basic representation of the seismic action .. 36 General .. 36 Horizontal clastic response spectrum .. 37 Vertical clastic response spectrum.

6 40 Design ground displacement .. 41 Design spectrum for elastic analysis .. 41 Alternative representations of the seismic action .. 42 Time -histOlY representation .. 42 Spatial model of the seismic action .. 43 Combinations of the seismic action with other actions .. 44 4 DESICN OF .. 45 GEN[RAL .. 45 2 BS EN 1998-1 :2004 EN 1998-1 :2004 (E) Scope .. 45 CHARACTERISTICS OF earthquake RESISTANT BUILDINGS ..45 Basic principles of conceptual Design ..45 Structural simplicity .. 45 symmetry and redundancy .. 45 Bi-dircctional resistance and stiffncss .. 46 Torsional resistance and stiffness .. 46 Diaphragmatic behaviour at storey level .. 46 foundation .. 47 Primary and secondary seismic members.]

7 47 Criteria for structural .. 48 General .. 48 Criteria for regularity in 49 Criteria for regularity in elevation .. 50 Combination coefficients for variable actions .. 52 Importance classes and importance factors .. 52 STRUCTURAL ANALYSIS .. 53 Modelling .. 53 Accidental torsional effects .. 54 Methods of analysis .. 54 General .. 54 Lateral force method of analysis .. 56 Modal response spcctrum analysis .. 59 Non-linear 111ethods .. 61 Combination oftlle effects of the compo11ents of the seismic action .. 64 Displacement ca1culation .. 66 Non-structural elements .. 66 General .. 66 Verification .. Inlportance factors .. 68 Behaviour factors .. 68 Additional measures for masonry infilled frames.

8 68 General .. 68 Requirements and criteria .. 69 Irregularities due to masonry infills .. 69 Damage limitation of intills .. 70 SAFETY VERIFICATIONS .. 71 General .. 71 Ultimate limit state .. 71 General .. 71 Resistance condition .. 71 Global and local ductility condition .. 72 Equilibrium conditiol1 .. 74 Resistance of horizontal diaphragms .. 74 Resistance of foundations .. 74 Seismic joint condition .. 75 lin1itation .. 76 Gencral .. 76 Lin1itation of drift .. 76 5 SPECIFIC RULES FOR CONCRETE BUILDI:\GS .. 78 GENERAL .. 78 Scope .. 78 Tenns and definitions .. 78 Design CONCEPTS .. 80 Energy dissipation capacity and ductility classes .. 80 Structural types and behaviour factors.

9 81 Structural types .. 81 Behaviour factors for horizontal seismic actiol1s .. 82 criteria .. 84 General .. 84 Local resistance condition .. 84 Capacity Design rule .. 84 Local ductility condition .. 84 3 BS EN 1998-1 :2004 EN 1998-1 :2004 (E) 4 Structural redundancy .. 86 Secondary seismic members and resistances .. 86 Specific additional measures .. 86 Safety verifications .. 87 Design EN 1992-J-J .. 87 General .. 87 1\1aterials .. 88 Behaviour factor .. 88 Design FOR DCM .. 88 Geometrical constraints and materials .. 88 Matcri8J requirenlents .. 88 Geometrical constraints .. 88 Design action effects .. 89 General .. 89 Beanls .. 89 COIU llll1S .. 91 Special provisions for ductile walls.

10 92 Special provisions for lightly reinforced walls .. 94 U LS verifications and detailing .. 95 Bcanls .. 95 ('OIUlllllS .. 97 Bealll-co!tlll111 .. 100 Ductile Walls .. 100 Large reinforced walls .. 104 DI::SIGN FOR DCH .. 106 Geometrical constraints and materials .. 106 J Material requirements .. 106 Geometrical constraints .. 106 Design action effects .. 107 Beanls .. 107 COIU1111lS .. 107 Beanl-colulllll .. 107 Ductile \Valls .. 108 ULS verifications and detailing .. 109 BeaI11s .. 109 COIUl1111S .. III Beanl-Colul1111 joints .. 112 Ductile \Valls .. 114 Coupling elements of coupled walls .. 119 PROVISIONS FOR ANCHORAGES AND SPLICES .. 120 General.)