ISO INTERNATIONAL STANDARD 23618 First edition 2022-10 Bases for design of structures : General principleson seismically isolated structures Bases du calcul des constructions - Principes géneraux des constructions munies d'isolateurs parasismiques Referencenumber IS023618:2022(E) iso @ ISO 2022 IS0 23618:2022(E) COPYRIGHT PROTECTED DOCUMENT @IS0 2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below orIso's memberbody in the country oftherequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved IS0 23618:2022(E) Contents Page Foreword. Introduction 1 Scope 2 Normative references.. 3 Terms and definitions... 3.1 Terms related to structure... 3.2 Terms related to isolation system..... 3.3 Terms related to structural design 3.4 Terms related to maintenance and construction.... Symbols and abbreviations ..... 4 5 Basic principles of structural planning. 5.1 General. 5.2 Isolation interface 5.3 Superstructure and substructure... 5.4 Foundation ... 5.5 Connections of isolation devices . 5.6 Isolation gap... 5.7 Non-structural components and equipment in isolation interface Target performance of the seismicallyisolated structure . 6 6.1 General .... 6.2 Superstructure. 6.3 Substructure 6.4 Isolation system. 7 Design seismic force 7.1 General. 7.2 Design response spectrum. 7.3 Design earthquake ground motion... Structural analysis 8 8.1 General 8.2 Modelling of isolation system... 8.3 Modelling of superstructure and substructure. 8.4 Response spectrum analysis method for equivalent linear system 8.4.1 General. 8.4.2 Basic reguirements. 8.4.3 Effective stiffness. 8.4.4 Effective period Effective damping.. 8.4.5 8.4.6 Maximum displacement of isolation system... 8.4.7 Seismic design forces... 8.5 Response history analysis method. 8.5.1 General. 8.5.2 Basic requirements 8.5.3 Number of earthquake ground motions . 8.5.4 Upper bound and lower bound of stiffness and force 12 8.5.5 Maximum displacement of isolation system... 8.5.6 Maximum storey drift and shear force of superstructure 12 9 Construction management specified in design documents ... 12 9.1 Construction planning ... 12 9.2 Quality control of isolation device manufacturing ... 12 9.3 Temporary work planning ... 12 9.4 Construction procedures of isolation interface... 12 @ IS0 2022 - All rights reserved iii