POST-TENSIONED CONCRETE FLOORS DESIGN HANDBOOK This Technical Report was prepared by a Working Party of the Society's Design Group which is one of the specialist technical groups within The Technical Development Cen:re. Members of the Working Party M E Raiis (Convenor) MA. PhD,CEng, MICE, MIStructE ROW& Benaim and Asmiates G A Bell.

S C O T TConcrete Society Technical Report No. 43 TR.043 Published 1994 ISBN 0 946691 45 2 Published by The Concrete Society No.

3, Eatongate Slough SL1 2JA Further copies may be obtained from Publication Sales, The Concrete Soaety QThe Concrete Society 1994 All rights reserved, except as permitted under current legislation. No part of this work may be photo- copied, stored in a retrieval system, published, performed in public, adapted, broadcast, transmitted, recordedorreproducedinanyform or byany means,withoutthepriorpermission ofcopyright owner.

Enquiries should be addressed to The Concrete Society. Although The Concrete Society (limited by guarantee) does its bestto ensure that any advice, reco-m- mendations or information ii may give either in this publication or elsewhere is accurate, no liability or responsibility of any kind(including liability for negligence) howsoever andfrom whatsoever cause arising, is accepted in this respect bythe Society, its servants or agents. CONCRETE SOCXET'II TECHNICAL REPORT POST-TENSIONED CONCRETE FLOORS - DESIGN HANDBOOK This TechnicalReport wasprepared by a Working Party oftheSociety's DesignGroup whichis one ofthespecialist technical groups within The Technical Development Cen:re. Members of the Working Party ME Rai i s (Convenor)ROW&Benaim and Asmiates MA. PhD,CEng, MICE, MIStructE G A Bell BSc, CEng, MICE P W Matthew BE, MSc, MIE AusL RT Whitde MA(Cdnmb), CEn& MICE CCL Syslems Ltd Swift Smcrures Ltd Ove Arup and Partners ACKNOWLEDGEMENT Duringthedraftingofthisreporttheworkingpartyreceivedalargenumberofhelpful commenrrcfrommembers of theindustry. Assistanceinpreparationofthereport bythefollowingmembersofArupResearchand Development is gratefully acknowledged: Kate Benton, Ian Feltham, JonathanF~nch, Geoff Lavender, Paula Youngs.

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CONTENTS 1.Intmduction 1.1Advantages of post-tensioned floors 12Sltuctural types considered 1.4Bonded ar unbonded tendons 1.5Analytical techniques 2.1Effecrs of pascess 2.2One-way and two-wayspanning flmrs 2.3Flexure inone-wayflmrs 2.4-Flexure infIatslab (hvo-way r p n g )... 2.4.1Fkt slab critehi2:. 3. Decapitator vst torrent rar zip. 1Column layout 3 3 ':Floor i h i c b and types.:,..

' 3 3,.?.Effect of reshaint tofloor shortening.:. 4.Materials 4.1Concrete 4.2Tenendons 4.2.1S m d4.

Kuudesign.com - Post-tensioning concrete increases the many benefits associated with a concrete framed building. The purpose of this publication is to widen the understanding of post-tensioned floor construction and show the considerable benefits which include minimum storey heights, rapid construction, economy, maximum design flexibility, minimum number of columns, optimum clear spans, joint-free, crack-free Post-tensioning- methods for reinforcing concrete. Post-tensioning tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed. Afterwards, once the concrete has gained strength but before the service loads are applied, the cables are pulled tight, or tensioned, and anchored against the outer edges of the concrete.Design of post-tensioned concrete floors. PT Designer is a computer program for the design and analysis of linear post-tensioned concrete floor systems.