Some papers deal with retrofitting and strengthening of existing slabs. This bulletin also presents new types of shear reinforcements and shows efficiency of distribution of classical shear reinforcing elements like headed studs. A paper dealing with the shear capacity of bridge slabs illustrates an extended strip model, which may be used for efficient assessment of bridge slabs under concentrated loads. It is confirmed that the bottom reinforcement crossing the column is very beneficial to ensure sufficient residual strength and avoid progressive collapse. The arrangement of reinforcement is important for the residual strength after a local failure and robustness, which are instrumental to avoid the progressive collapse of the entire structure after a local failure. the nominal load carrying capacity of thicker slabs is lower than that of thin slabs). Particular attention is paid to the so-called size effect (i.e.
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The individual papers generally show the studied phenomena using experiments and analytical evaluation, which makes it possible to compare results obtained according to the European code (EC2), the ACI code and the international code, the fib Model Code for Concrete Structures (MC2010). This bulletin provides a review of the performance of slabs under static, dynamic and seismic loading. The papers included in this bulletin provide new experimental evidence and a comprehensive review of analytical and numerical methods that are used to evaluate the structural performance of slabcolumn connections. This bulletin is a result of an international symposium where experts from fib and ACI met and exchanged their experience. Punching and shear capacity of structures is often evaluated using empirical methods, which does not always provide a sufficient level of safety. Punching may result in brittle failure, which requires that special attention be paid to the design of new structures and the assessment of existing ones. Flat slabs are used in buildings, bridges and other structures. Punching is one of the most frequent reasons for failure of concrete structures, which underlines the importance of this problem. Printed by DCC Document Competence Center Siegmar Kästl e.K., GermanyĪCI-fib International Symposium Punching shear of structural concrete slabsįoreword fib Bulletin 81 deals with punching of slabs, which is a relevant issue in the design of reinforced concrete.
ISSN 1562-3610 ISBN 978-2-88394-121-2 Layout by Laura Vidale on behalf of the fib secretariat. No part of this publication may be reproduced, modified, translated, stored in a retrieval system, or transmitted in any form or by any means-electronic, mechanical, photocopying, recording, or otherwise-without prior written permission from the fib. © Fédération internationale du béton (fib) and American Concrete Institute (ACI), 2017 Although the International Federation for Structural Concrete / Fédération internationale du béton (fib) does its best to ensure that any information given is accurate, no liability or responsibility of any kind, including liability for negligence, is accepted in this respect by the organisation, its members, servants or agents.
This bulletin is also published as an ACI Symposium Publication, ACI SP-315.Ĭover images: Saw-cuts of inner slab-column connections failed in punching.
Although these contributions have not been discussed in any of the fib’s working bodies, the subject matter is highly topical and believed to be of general interest to members of the fib. The authors have presented their individual views. fib Bulletin 81 is published as a technical report and is a collection of contributions to a symposium that was co-sponsored by the fib and the American Concrete Institute (ACI). Manual/Guide to good practice/RecommendationĪny publication that has not met the above requirements will be clearly identified as preliminary draft. Task group and the chairpersons of the Commission
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Ospina, Denis Mitchell and Aurelio Muttoni April 2017Īpproval of this bulletin 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. Technical report Proceedings of a symposium held in Philadelphia, PA, USA, on 25 October 2016 Edited by Carlos E. Punching shear of structural concrete slabs: Honoring Neil M.
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