Cross Laminated Timber CLT Structural Design Basic Design and Engineering Principles According to Eurocode

proHolz Austria No vember 201 4

Cross-Laminated Timber

Structural Design

Basic design and

engineering principles

according to Eurocode

Cross-laminated timber as an innovative structural element opens up new possibilities in structural timber construction. The present guideline is to assist in properly exploiting and implementing these possi bilities in planning and execution.

Firstly, the two-dimensional construction product cross-laminated timber (BSP or XLAM) is described with respect to its manufacture and its properties. This is followed by the description of the structural behaviour, basic design principles and fire perfor-mance and then modelling assumtions and charac-teristic material values according to Eurocode. Joining technology focuses on self-tapping woods-crews; this section is supplemented by general design proposals. Structural behaviour of buildings under horizontal loads and earthquake resistance associated therewith conclude the general part. Application examples underline the described

con-tents for easier access and discussion of extensive engineering models.

DI Dr. Markus Wallner-Novak DI Josef Koppelhuber DI Kurt Pock

Analysis and structural design of timber structures isbn 978-3-902926-03-6 | Euro 35

Cross-Laminated Timber

Structural Design

Basic design and engineering principles

according to Eurocode

Publication details Owner and publisher proHolz Austria

Working group of the Austrian timber industry for promotion of the application of timber Chairman Hans Michael Offner Managing Director Georg Binder Project Management Alexander Eder 1011 _{Vienna⁄ Austria} Uraniastrasse 4 T + 43 (0)1 ⁄ 712 04 74 [email protected], www.proholz.at Financial support by Binderholz Bausysteme GmbH A-5400 Hallein Solvay-Halvic-Straße 46 T + 43 (0)6245 ⁄ 70 500 - 556 [email protected] www.binderholz-bausysteme.com Haas Fertigbau Holzbauwerk GesmbH & Co kg A-8263 Großwilfersdorf Radersdorf 62 T + 43 (0)3385 ⁄ 666 - 0 [email protected] www.haas-fertigbau.at Mayr-Melnhof Holz Holding ag A-8700 Leoben, Turmgasse 67 T + 43 (0)3842 ⁄ 300 - 0 [email protected] www.mm-holz.com Merk Timber GmbH D-86551 Aichach Industriestraße 2 T + 49 (0)8251 ⁄ 908 - 0 [email protected] www.merk.de

Hasslacher Norica Timber A-9751 Sachsenburg Feistritz 1 T + 43 (0)4769 ⁄ 2249 - 0 [email protected] www.hasslacher.at Stora Enso Building and Living A-9462 Bad St. Leonhard Wisperndorf 4

T + 43 (0)4350 ⁄ 2301 - 3207 buildingsolutions@ storaenso.com www.clt.info Fachverband der Holz-industrie Österreichs A-1037 Wien Schwarzenbergplatz 4 T + 43 (0)1 ⁄ 712 26 01 [email protected] www.holzindustrie.at Authors DI Dr. Markus Wallner-Novak DI Josef Koppelhuber DI Kurt Pock Design

Cover Gassner Redolfi, Schlins (at) Reinhard Gassner, Marcel Bachmann Contents Markus Wallner-Novak Print Eberl Print, Immenstadt (de) Translation

Translation agency Allesprachen, Graz 1_{st edition english 2014, 600 copies} Translation on the basis of the German version of September 2013

Price per copy 35 Euros, incl. vat, excl. shipment isbn 978-3-902926-03-6

issn 1680-4252

Printed on pefc-certified paper. This product originates from sustainably managed forests and controlled sources. www.pefc.at

Copyright 2014 by proHolz Austria and the authors. The publication and any contributions and figures contained therein are copyrighted. Any use beyond the limits of copyright without the publisher’s approval is inadmissible and punishable. proHolz Austria and the authors endeavour to research or state, respectively, information correctly and completely. However, we ask for your understanding that no liability can be assumed for the contents.

Foreword

The development of timber construction over the past hundred years has been characterised by enor-mous innovation. The elements made of timber and timber materials as well as the joining technique have undergone constant further development. The timber, or more exactly the individual board, represents the basis for glued-laminated timber, board stack elements or cross-laminated timber. At the first glance, the relatively “new” construction material cross-laminated timber – its practical, economically relevant use in the building sector started about twenty years ago – is a simple con-struction material. It consists of strength-graded laminations, which are glued together crosswise at 90° to an odd number of layer. Superficially, a homogeneous wooden panel is formed. Upon closer examination by the engineer, however, the complexity of this structural element can be noticed: it is an orthogonally layered, laminar composite element made of wood with a complex calculation basis.

“Everything should be made as simple as possible, but not simpler.”

(Albert Einstein, 1879 – 1955)

The present structural design manual is giving designers, engineering consultants and performers an understanding of the basic principles for techni-cally proper planning and application of cross-lami-nated timber. The main focus is on the structural function of cross-laminated timber as a load-bearing structural element and on the requirements associ-ated therewith. For joining the cross-laminassoci-ated timber elements, design proposals were prepared. The structural design guideline enables practition-ers an easy and fast undpractition-erstanding of the con-struction pro duct cross-laminated timber, since the verifications required in terms of structural engi-neering are described with the associated engineer-ing calculation models and explained on the basis of practical examples. This structural design manu-al was meticu lously and thoroughly prepared by DI Dr. Markus Wallner-Novak and his co-authors DI Josef Koppelhuber and DI Kurt Pock. Here, the engineer will find answers to the essential issues when it comes to the structural design of cross-laminated timber, so that this manual represents an important contribution to practical dimensioning of cross-laminated timber.

Wilhelm Luggin

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