The Institution of Structural Engineers and BM TRADA

Manual for the design of timber building structures to Eurocode 5 (2nd edition)

Revising author (second edition: 2019–)

K Ranasinghe BSc(Hons) PhD (University of Wales, Trinity Saint David)

Reviewers

G Evans BSc(Hons) PhD CEng FICE FIStructE MBCS (Constructex)

R J L Harris BSc CEng FICE FIStructE FIMMM (Time for Timber Ltd)

D Trujillo MSc CEng MIStructE (University of Coventry)

Publishing

L Baldwin BA(Hons) Dip Pub (The Institution of Structural Engineers)

J Shanahan BA(Hons) MA (BM TRADA)

Acknowledgements

The Institution of Structural Engineers acknowledges the input and support of TRADA and its service provider BM TRADA in the development of this Manual.

Permission to reproduce extracts from British Standards is granted by BSI. British Standards can be obtained in PDF or hard copy formats from the BSI online shop: www.bsigroup.com/Shop or by contacting BSI Customer Services for hardcopies only:

Tel: +44 (0)20 8996 9001, Email: cservices@bsigroup.com.

Figure 10.10: © BRE, reproduced with permission from Multi-storey timber frame buildings: a design guide (BR 454).

Front cover image: The Macallan Distillery, Moray, Scotland. Project by Rogers Stirk Harbour+Partners. Photo © Joas Souza

Published by The Institution of Structural Engineers and BM TRADA International HQ, 47–58 Bastwick Street, London EC1V 3PS, United Kingdom

T:+44(0)20 7235 4535

E: mail@istructe.org

W: www.istructe.org

First published (version 1.0) December 2019

ISBN 978-1-906335-36-6 (print)

ISBN 978-1-906335-37-3 (pdf)

© 2019 The Institution of Structural Engineers and Warringtonfire Testing and Certification Ltd

The Institution of Structural Engineers, TRADA, the author and reviewers who produced this Manual have endeavoured to ensure the accuracy of its contents. However, the guidance and recommendations given should always be reviewed by those using the Manual in light of the facts of their particular case and any specialist advice. No liability for negligence or otherwise in relation to this Manual and its contents is accepted by the Institution, TRADA, their servants or agents. Any person using this Manual should pay particular attention to the provisions of this Condition. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means without prior permission of The Institution of Structural Engineers, who may be contacted at 47–58 Bastwick Street, London EC1V 3PS, United Kingdom.

Foreword

For structural engineers in the UK who were familiar with the permissible stress approach of BS 5268 in the UK, the move to load factor design in Eurocode 5 (BS EN 1995) marked a significant change in approach to timber design. It is now almost 15 years since that first full version of Eurocode 5 was published and much has changed. The code offered a more rigorous standard as compared with its predecessor and also it enabled pan-European collaboration in research and practice. This has enabled timber’s full potential to be released, and the extent and scale of timber engineering in the UK and throughout Europe has expanded enormously.

It is, therefore, now timely for the publication of a fully revised second edition of the Manual. Whereas the first edition drew on the services of a task group convened by the IStructE, for the second edition Keerthi Ranasinghe alone has taken on the daunting task of reviewing the first edition for the necessary updates needed to comply with changes in BS EN 1995. He has gone about this methodically and rigorously, consulting with practising engineers as he has worked at the task. We owe a debt of gratitude to Keerthi for undertaking this work and, in commending this revised Manual to the construction industry, I also offer him our thanks.

Richard Harris

BSc CEng FIStructE FICE FIMMM

A note from the revising author

‘It was vital that we updated the manual considering all the amendments that were implemented in not just Eurocode 5, but all the supporting standards as well since 2004. By far the leading resource for timber engineering, the new edition ensures that it will continue to be the must-have reference for engineers and specifiers who are keen to work to Eurocode 5’.

Keerthi Ranasinghe

BSC(Hons) PhD