Subject to priorities defined by the Technical Council and the Presidium, the results of the fib's work in commissions and task groups are published in a continuously numbered series of technical publications called bulletins. The following categories are used: Category: Approval by: Technical report Task group and chairpersons of the commission State-of-the-art report Commission Manual / Guide to good practice / Recommendation Technical Council Model code General Assembly Any publication not having met the above requirements will be clearly identified as a preliminary draft. Cover images: Combe Maran viaduct in St. Ursanne (CH), credit photo Hoffmann, M. (2021) created on the basis of publicly available UAV/UAS data of the Combe Maran viaduct in St. Ursanne (CH) created with Agisoft Metashape and 3DFlow Zephyr.© Fédération internationale du béton (fib) 2023.Although the International Federation for Structural Concrete / Fédération internationale du béton (fib) does its best to ensure that all the information presented in this publication is accurate, no liability or responsibility of any kind, including liability for negligence, is accepted in this respect by the organisation, its members, employees or agents.All rights reserved. No part of this publication may be reproduced, modified, translated, stored in a retrieval system or transmitted in any form or by any means -electronically, mechanically, through photocopying, recording or otherwise -without prior written permission from the fib.