Structural Timber Design to Eurocode 5 provides practising engineers and specialist contractors with comprehensive, detailed information and in-depth guidance on the design of timber structures based on the common rules and rules for buildings in Eurocode 5 Part 1-1. It will also be of interest to undergraduate and postgraduate students of civil and structural engineering.

It provides a step-by-step approach to the design of all of the commonly used timber elements and connections using solid timber, glued laminated timber or wood based structural products, and incorporates the requirements of the UK National Annex. It covers:

strength and stiffness properties of timber and its reconstituted and engineered products

key requirements of Eurocode 0, Eurocode 1 and Eurocode 5 Part 1-1

design of beams and columns of solid timber, glued laminated, composite and thin-webbed sections

lateral stability requirements of timber structures

design of mechanical connections subjected to lateral and/or axial forces

design of moment resisting rigid and semi-rigid connections

racking design of multi-storey platform framed walls.

Featuring numerous detailed worked examples, the second edition has been thoroughly updated and includes information on the consequences of amendments and revisions to EC5 published since the first edition, and the significant additional requirements of BSI non contradictory, complimentary information document (PD 6693-1-1) relating to EC5. The new edition also includes a new section on axial stress conditions in composite sections, covering combined axial and bending stress conditions and reference to the major revisions to the design procedure for glued laminated timber.

From a review of the fi rst edition

This is a must for all those involved in timber structures and their design...Building Engineer: July 2008

The Authors

Jack Porteous is a consulting engineer specialising in timber engineering. He is a Chartered Engineer, Fellow of the Institution of Civil Engineers and Member of the Institution of Structural Engineers. He is a member of the BSI committee B/525/5, which is responsible for the structural use of timber in the UK and for the production of UK input to EN 1995-1-1. He is a member of the editorial advisory panel of the ICE publication, Construction Materials and a visiting scholar and lecturer in timber engineering at Edinburgh Napier University.

Abdy Kermani is the Professor of Timber Engineering and Director of the UKs Centre for Timber Engineering at Edinburgh Napier University. He is a Chartered Engineer, Fellow of the Institution of Structural Engineers and Fellow of the Institute of Wood Science. He has served on the organising committees and editorial technical advisory boards of international journals and conferences on timber engineering and the innovative use of construction materials. He is the appointed principal consultant to several UK and European structural and timber engineering firms and manufacturing industries.

Structural Timber Design

to Eurocode 5

Structural Timber D

esign to Eurocode 5

Jack Porteous and Abdy Kermani

PorteousKermani

2nd Edition

Structural Timber Design to Eurocode 5Jack Porteous and Abdy Kermani

2nd Edition 2nd Edition

pg3913File Attachment9780470675007.jpg

Structural timber DeSignto eurocode 5

To Margaret and John

Dawn and Romi

Structural timber DeSignto eurocode 5

2nd edition

Jack Porteous bSc, mSc, Dic, PhD, ceng, miStructe, FiceDirectorJack Porteous Consultancy

and

abdy Kermani bSc, mSc, PhD, ceng, FiStructe, FiWScProfessor and Director of Centre for Timber EngineeringEdinburgh Napier University

A John Wiley & Sons, Ltd., Publication

Jack Porteous and Abdy Kermani 2013Published 2013 by Blackwell Publishing Ltd.First edition published 2007 by Blackwell Publishing

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Library of Congress Cataloging-in-Publication Data

Porteous, Jack. Structural timber design to Eurocode 5 / Jack Porteous and Abdy Kermani. 2nd edition. pages cm Includes bibliographical references and index. ISBN 978-0-470-67500-7 (pbk.)1. Building, WoodenStandardsEurope. 2. Structural framesDesign and constructionStandardsEurope. 3. TimberStandardsEurope. I. Kermani, Abdy. II. Title. TA666.P66 2013 694.02184dc23

2012051136

A catalogue record for this book is available from the British Library.

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1 2013

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v

Contents

Preface to the Second Edition xii

1 Timber as a Structural Material 11.1 Introduction 11.2 The structure of timber 21.3 Types of timber 3

1.3.1 Softwoods 31.3.2 Hardwoods 4

1.4 Natural characteristics of timber 41.4.1 Knots 41.4.2 Slope of grain 51.4.3 Reaction wood 51.4.4 Juvenile wood 61.4.5 Density and annual ring widths 61.4.6 Conversion of timber 71.4.7 Seasoning 111.4.8 Seasoning defects 111.4.9 Cracks and fissures 111.4.10 Fungal decay 11

1.5 Strength grading of timber 111.5.1 Visual grading 121.5.2 Machine grading 121.5.3 Strength classes 15

1.6 Section sizes 161.7 Engineered wood products (EWPs) 16

1.7.1 Glued-laminated timber (glulam) 181.7.2 Cross-laminated timber (CLT or X-Lam) 201.7.3 Plywood 211.7.4 Laminated Veneer Lumber (LVL) 251.7.5 Laminated Strand Lumber (LSL), TimberStrand 251.7.6 Parallel Strand Lumber (PSL), Parallam 271.7.7 Oriented Strand Board (OSB) 271.7.8 Particleboards and fibre composites 391.7.9 Thin webbed joists (I-joists) 391.7.10 Thin webbed beams (box beams) 411.7.11 Structural Insulated Panels (SIPs) 42

1.8 Suspended timber flooring 441.9 Adhesive bonding of timber 46

vi Contents

1.10 Preservative treatment for timber 471.11 Fire safety and resistance 481.12 References 50

2 Introduction to Relevant Eurocodes 522.1 Eurocodes: General structure 522.2 Eurocode 0: Basis of structural design (EC0) 54

2.2.1 Terms and definitions (EC0, 1.5) 542.2.2 Basic requirements (EC0, 2.1) 552.2.3 Reliability management (EC0, 2.2) 562.2.4 Design working life (EC0, 2.3) 562.2.5 Durability (EC0, 2.4) 572.2.6 Quality management (EC0, 2.5) 582.2.7 Principles of limit state design: General (EC0, 3.1) 582.2.8 Design situations (EC0, 3.2) 582.2.9 Ultimate limit states (EC0, 3.3) 592.2.10 Serviceability limit states (EC0, 3.4) 592.2.11 Limit states design (EC0, 3.5) 602.2.12 Classification of actions (EC0, 4.1.1) 602.2.13 Characteristic values of actions (EC0, 4.1.2) 602.2.14 Other representative values of variable actions (EC0, 4.1.3) 612.2.15 Material and product properties (EC0, 4.2) 622.2.16 Structural analysis (EC0, 5.1) 622.2.17 Verification by the partial factor method: General (EC0, 6.1) 652.2.18 Design values of actions (EC0, 6.3.1) 652.2.19 Design values of the effects of actions (EC0, 6.3.2) 662.2.20 Design values of material or product properties (EC0, 6.3.3) 662.2.21 Factors applied to a design strength at the ULS 712.2.22 Design values of geometrical data (EC0, 6.3.4) 712.2.23 Design resistance (EC0, 6.3.5) 712.2.24 Ultimate limit states (EC0, 6.4.16.4.5) 732.2.25 Serviceability limit states: General (EC0, 6.5) 77

2.3 Eurocode 5: Design of Timber Structures Part 1-1: General Common Rules and Rules for Buildings (EC5) 792.3.1 General matters 792.3.2 Serviceability limit states (EC5, 2.2.3) 802.3.3 Load duration and moisture influences on strength

(EC5, 2.3.2.1) 842.3.4 Load duration and moisture influences on deformations

(EC5, 2.3.2.2) 842.3.5 Stressstrain relations (EC5