ISO/TR TECHNICAL REPORT 15657 First edition 2013-06-15 Fire resistance tests Guidelines for computational structural fire design Essais de reésistance au feu - Lignes directrices sur la conception statistiquedesfeuxdestructures Reference number IS0/TR 15657:2013(E) LSO IS02013 IHS under itted without license from IHS Not for Resale IS0/TR 15657:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO2013 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. ISOcopyrightoffice Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0/TR 15657:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Basic principles. 2.1 Primary objectives of fire safety design .1 2.2 Performance criteria .2 3 Design process ..4 3.1 Fire model. 4 3.2 Heat transfer model. ..5 3.3 Structural model .6 3.4 Combination models ..6 3.5 Material properties. .8 Fire models. .12 4.1 Standard (nominal) fires .12 4.2 Naturalfires .14 4.3 Numerical simulation ofnatural fires -Zone models .16 4.4 Heat flux to the structure. .18 5 Heat transfer models for temperature calculations .20 5.1 Uniform temperature. 21 5.2 Non uniform heating. 28 5.3 Time equivalent. .32 6 Structural design .36 6.1 Mechanical properties 36 6.2 Thermo physical properties 51 6.3 Thermal properties of structural fire protection 68 6.4 Structural fire design methods. ..70 Annex A (informative) National Fire Engineering Codes for Structural Design ..76 Bibliography ..77 iii ded by IHS under lic ense with ISt ed without license from IHS Not for Resale