EN 1998-3: Eurocode 8: Design of structures for earthquake ...

1 Th eEu rop eanUn ion EDI. CTOFGOVERNMENT . Inor dertopromotepubl iceduca ti onandpubl ics afet y,equ aljus ti cefora ll , abet te ri n for me dcit iz enry,th eruleo flaw,worl dtra deandworldpea ce, t hisl egaldoc ume n tisherebymadeav ail abl eonan onc ommerci albas is ,asit i stheri ghtofallhumanstoknowandspe akthela wsthatgov ernthe m. EN 1998-3 (2005) (English): Eurocode 8: Design of structures for earthquake resistance Part 3: Assessment and retrofitting of buildings [Authority: The European Union Per Regulation 305/2011, Directive 98/34/EC, Directive 2004/18/EC].

2 EUROPEAN STANDARD EN 1998-3. NORME EUROPEENNE. EUROpAISCHE NORM June 2005. ICS Supersedes ENV 1998-1-4:1996. Incorporating corrigendum March 2010. English version Eurocode 8: Design of structures for earthquake resistance - Part 3: Assessment and retrofitting of buildings Eurocode 8: Calcul des structures pour leur resistance aux Eurocode 8: Auslegung von Bauwerken gegen Erdbeben seismes - Partie 3: Evaluation et renforcement des Teil 3: Beurteilung und ErtUchtigung von Gebauden batiments This European Standard was approved by CEN on 15 March 2005.

3 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 other language made by translation under the responsibility of a CEN member into its own language and notified to the Central.

4 <;:'""~r,,,l ""ri,;:,t 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. COMMITTE!:: FOR ST;\1\DARDlZAT10N. ElJROPEEN DE 1\ORMALlSATION. EUROPAISCHES KOMIT F R 1\ORMU1\G. Management Centre: rue de Stassart, 36 B 1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved Ref.

5 No. EN 1998-3: 2005: E. worldwide for CEN national Members. BS EN 1998-3: 2005. EN 1998-3: 2005 (E). Contents Page FORE\VORD .. 4. 1 G ENE I~A L .. 9. SCOPE .. 9. NORIV1 ATIVE REFERENCES .. 10. General reference standard., .. 10. ASSLIMPTIONS ..10. DISTINCTION BET\VEEN PRINCIPLES AND APPLICATION RULES .. 10. DEFIN1 TIONS .. 10. SYIVIBOLS .. 10. GeJ1eral .. 10. Symbols u5,'ed in Annex A .. 10. SymboL,,;' used in Annex B .. 12. S .1. U N 11~S .. 13. 2 PERFORlVlANCE REQUIREME~TS AND COMPLIA~CE CRITERIA .. 14. REQUIREI\1EN rS .. 14. c CRJTE llll\.

6 15. General .. 15. Limit State ofl/ear Collapse (1\fC) .. 15. Limit State of Signtficant Damage (SD) .. 16. 4 Limit State of Dam age Li/nitation (DL) .. 16. 3 IN FORJ\lATION FOR STRUCTURAL ASSESSMENT .. 17. GENERAL .INFORMATION AND HISTORY .. 17. REQUIRED INPUT DA1'A .. 17. KNO\VlJEDGE LEVELS .. 18. Definition of kn01 Nledge levels .. 18. 1([1: Limited knowledge .. 19. KL2: JVormal knowledge .. 20. KL3: Full knowledge .. 20. IDENTIFICATION OF THE KNOWLEDGE LEVEL .. 21. Geol11etlY .. 21. Det(Jils .. 22. Materials .. Definition levels of inspection and testing.))]

7 23. CONFIDENCE FACTORS .. 23. 4 ASSESSNIENT .. 24. GEN EJ{AL .. 24. SEISM IC ACTION AND SEISlVIlC LOAD COJ\1 BINATION .. 24. STRlJCcrURAL MODELLING .. 24. METHODS OF i\NAL \:TSIS .. 25. Gel1el al .. 25. Lateralforce analysis .. 25. kfulti-modal response spectrum analysis .. 26. Nonlinear static ana~ysis .. 26. iVon-linear time-histor,v analysis .. 27. c7pproclch .. 27. 2. BS EN 1998-3: 2005. EN 1998-3: 2005 (E). Combination of the components of the seismic action .. 27. Additional measuresfor masonry infilled structures .. 28. Combination coefficients for variable actions.}

8 28. importance classes and importance factors .. 28. SAFETY V'ERIFICA'fIONS .. 28. Linear methods of analysis (lateral force or modal response spectrum analysi5) 28. Nonlinear method,> of analysis ~s'tatic or dynamic) .. 29. q:factor approach .. 29. OF CRITERIA FOR ANALYSIS AND SAFETY VERIFICATIONS .. 29. 5 DECISIONS F'OR STRUCTURAL INTERVENTION .. 31. CRITERIA FOR A STRUCTURAL INTERVENTION .. 31. Introduction .. 31. Technical criteria .. 31. Type of intervention .. 31. Non-structural elements .. 32. lust[fication of the selected intervention type.]

9 32. 6 Design OF STRUCTURAL INTERVENTION .. 34. RETROFIT Design PROCEDURE .. 34. ANNEX A (INFORMATIVE) REINFORCED CONCRETE ANNEX B (INFORMATIVE) STEEL AND COMPOSITE structures .. 55. ANNEX C (INFORMATIVE) MASONRY BUILDINGS .. 81. 3. BS EN 1998-3: 2005. EN 1998-3: 2005 (E). Foreword This European Standard EN 1998-3, Eurocode 8: Design of structures for earthquake Assessnlent and Retrofitting of buildings, has been prepared by Technical Comnlittee CEN/TC 250 "Structural Eurocodes", the secretariat of vvhich is held by BSL CEN/TC 250 is responsible for all Structural Eurocodes.

10 This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn at the latest by March 2010. This dOCUl11ent supersedes ENV 1998-1 1996. According to CEN-CENELEC Internal Regulations, the National Standard Organisations of the following countries are bound to inlplement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Gernlany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxenlbourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdoll1.