TECHNICAL ISO/TR REPORT 24679-6 First edition 2017-12 Fire safety engineering Performance of structures in fire - Part 6: Example of an eight-storey office concrete building Ingenieriede la securité incendie-Performance des structures en situationdincendie- Partie 6:Exemple d'un immeuble de bureaux de huit étages en beton renforcé Reference number IS0/TR 24679-6:2017(E) ISO @ISO2017 IS0/TR24679-6:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, 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 or ISo's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org i IS02017-All rights reserved IS0/TR24679-6:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 ..2 Symbols..... 3 4 Design strategy for fire safety of structure 4.1 General designprocess for fire safety of structures .3 4.2 Guidance of practical design processforfire safety of structure .3 5 Qualification oftheperformance of structures infire .3 5.1 STEP1: Scope of the project forfire safety of structure .3 .3 5.1.1 Built-environmentcharacteristics. 5.1.2 Fuel loads 6 5.1.3 Mechanical actions 7 5.2 STEP2:Identifying objectives,functional requirements,and performance criteria forfire safety of structure .8 5.3 STEP 3: Trial plan for fire safety of structure .10 5.4 STEP 4: Design fire scenarios and design fires .10 5.4.1 General. .10 5.4.2 Design fire scenarios .10 5.4.3 Design fires .11 5.5 STEP 5: Thermal response of the structure .17 5.5.1 General. .17 5.5.2 Thermal analysis of the slab .18 5.5.3 Thermal analysis of thebeam. .19 5.5.4 Thermal analysis of the column 21 5.6 STEP 6: Mechanical response of the structure 21 5.6.1 Structural model 21 Assumptions of the analysis. .22 5.6.2 5.6.3 Structuralbehaviourof thebuilding 24 5.7 STEP 7: Assessment against the fire safety objectives. 34 5.8 STEP8:Documentationofthedesignforfiresafetyofstructures .34 5.9 STEP 9:Factors and influences tobe considered in the quantification process .35 5.9.1 Material properties... ..35 Annex A (informative)Heattransfer of calculation ..39 AnnexB (informative)Resultsfromthermalandmechanical analyses ..40 Annex C (informative) Results from OAT sensitivity analysis for the uncertainty of materialproperties ..44 Bibliography .48 IS0 2017-All rights reserved ili