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  • Structural connections for precast concrete buildings

    Contents1 Introduction2 Precast structural systems and structural

    interaction3 Basic considerations for the design of

    structural connections4 Other design aspects5 Structural integrity6 Transfer of compressive force7 Transfer of tensile force8 Transfer of shear force9 Transfer of bending and torsional momentReferencesAppendix A Examples of analysis of accidental

    collapse mechanisms

    fdration internationale du btonInternational Federation for Structural Concrete www.fib-international.org

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    08-02-11-U43-wz.qxd 12.02.2008 8:36 Uhr Seite 1

  • Structural connections for precast concrete

    buildings

    Guide to good practice prepared by

    Task Group 6.2

    February 2008

  • Subject to priorities defined by the Technical Council and the Presidium, the results of fibs work in Commissions and Task Groups are published in a continuously numbered series of technical publications called 'Bulletins'. The following categories are used:

    category minimum approval procedure required prior to publication Technical Report approved by a Task Group and the Chairpersons of the Commission State-of-Art Report approved by a Commission Manual, Guide (to good practice) or Recommendation

    approved by the Technical Council of fib

    Model Code approved by the General Assembly of fib

    Any publication not having met the above requirements will be clearly identified as preliminary draft. This Bulletin N 43 was approved as an fib Guide to good practice by the Technical Council of fib in June 2006

    This report was drafted by Task Group 6.2, Structural connections for precast concrete, in Commission 6, Prefabrication:

    Bjrn Engstrm (Convener, Chalmers Univ. of Technology, Sweden)

    Sven Alexander (Norway), Andrzej Cholewicki (Building Research Institute (ITB), Poland), Andr De Chefdebien (LB7, France), Bruno Della Bella (Precompressi Centro Nord SpA, Italy), Kim S. Elliott (Univ. of Nottingham, United Kingdom), David Fernndez Ordoez (Prefabricados Castelo S.A., Spain), Marco Menegotto (Univ. La Sapienza, Roma, Italy), Michael Newby (Holmes Consulting Group, New Zealand), Gunnar Rise (Sweden), Harry Romanes (Unicast Concrete Ltd.), Arne Skjelle (Construction Products Association, Norway), Spyros Tsoukantas (Greece), N. Jan A. Vambersky (Corsmit Consulting Engineers, The Netherlands), Arnold van Acker (Belgium), Leidulv Vinje (Spenncon AS Trondelag, Norway)

    Full address details of Task Group members may be found in the fib Directory or through the online services on fib's website, www.fib-international.org. Cover image: Beam-column connection and floor-beam connection in precast concrete skeletal frame fdration internationale du bton (fib), 2008 Although the International Federation for Structural Concrete fib - fderation internationale du bton - 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. All rights reserved. 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. First published in 2008 by the International Federation for Structural Concrete (fib) Postal address: Case Postale 88, CH-1015 Lausanne, Switzerland Street address: Federal Institute of Technology Lausanne - EPFL, Section Gnie Civil Tel +41 21 693 2747 Fax +41 21 693 6245 [email protected] www.fib-international.org ISSN 1562-3610 ISBN 978-2-88394-083-3 Printed by Sprint-Digital-Druck, Stuttgart

  • fib Bulletin 43: Structural connections for precast concrete buildings iii

    Foreword Connections are among the most essential parts in precast structures. Their performance relates to the structural limit states, as well as to manufacture, erection and maintenance of the structure itself. Proper design of connections is one major key to a successful prefabrication.

    The literature on this matter mostly illustrates classical solutions, often well known, but an explanation of a general design philosophy for the design of connections was necessary. In fact, the engineer, confronted with particular problems in his daily practice, does not always have the theoretical basis to find the most appropriate solutions.

    fib Commission 6 Prefabrication therefore formed a Task Group TG 6.2 who drafted this Guide to Good Practice with the goal of filling this gap. Its philosophy focuses on the knowledge of the behaviour of a whole structure, of the mechanisms and paths of force transfer within the connections and of their interaction with the structural members. Indeed, such knowledge is the base for assessing the safety and reliability of usual types of connections and to develop innovative design.

    The Task Group has been working during several years, to collect and discuss information and studies about the different aspects intervening in the design of structural connections for precast concrete structures. The result is a voluminous document, with a comprehensive survey of basic principles and design guidelines, illustrated by several examples of adequate solutions.

    Throughout these years, the Commission, chaired by the undersigned persons, supported the activity of the Task Group with comments and discussion. However the merit for the finalization of the work into this Guide must be acknowledged as mainly due to the tenaciousness of its Convener, Prof. Bjrn Engstrm of Chalmers University, Sweden.

    Arnold Van Acker Gunnar Rise Marco Menegotto Past Chairman Past Chairman Chairman Commission 6 - Prefabrication

    Acknowledgement Several figures in this publication have been provided by the Norwegian Association for Precast Concrete, Betongelementforeningen and Chalmers University of Technology. A considerable number of sketches have been redrawn by Holmes Consulting Group in Auckland, New Zealand. This valuable support is gratefully acknowledged. Other figures and photos have been provided by the Task Group members.

    Copyright fib, all rights reserved. This PDF copy of fib Bulletin 43 is intended for use and/or distribution only within National Member Groups of fib.

  • iv fib Bulletin 43: Structural connections for precast concrete buildings

    Contents PART I General considerations and design philosophy 1 Introduction 1

    1.1 The role of structural connections in precast concrete building structures 1 1.2 Aim and scope 4 1.3 Outline of the document 4

    2 Precast structural systems and structural interaction 5

    2.1 Basic precast concrete systems 5 (2.1.1 Beam and column systems 2.1.2 Floor and roof systems 2.1.3 Wall systems 2.1.4 Moment resisting frame systems 2.1.5 Cell systems)

    2.2 Structural systems 9 (2.2.1 Conceptual design 2.2.2 Force paths 2.2.3 Structural movements)

    2.3 Structural sub-systems 18 (2.3.1 Precast floors 2.3.2 Precast walls 2.3.3 Moment resisting frames 2.3.4 Composite action and composite members)

    3 Basic considerations for the design of structural connections 31

    3.1 Principal arrangement and definitions 31 3.2 Design philosophy

    (3.2.1 Design for the structural purpose 3.2.2 Design aspects 3.2.3 Aspects on connection methods)

    3.3 Force transfer mechanisms and the mechanical behaviour 35 (3.3.1 Force transfer types 3.3.2 Mechanical characteristics)

    3.4 Design of connection zones by the strut-and-tie method 38 3.5 Need for movement and restrained deformation 40

    (3.5.1 Consideration of the need for movement 3.5.2 Unintended restraint 3.5.3 Unintended composite action 3.5.4 Full and partial continuity)

    3.6 Balanced design for ductility 49 3.7 The flow of forces through connections examples 51

    4 Other design aspects 55

    4.1 Production, transportation and erection 55 (4.1.1 Considerations in production 4.1.2 Considerations for transportation 4.1.3 Considerations for erection 4.1.4 Modular co-ordination 4.1.5 Tolerances 4.1.6 Quality control 4.1.7 Economy)

    4.2 Serviceability, functionality and durability of the building 64 (4.2.1 Requirements in the serviceability limit state 4.2.2 Structural behaviour 4.2.3 Moisture and water ingress control 4.2.4 Sound insulation and dynamic response to vibrations 4.2.5 Heat insulation 4.2.6 Durability 4.2.7 Aesthetic aspects and tolerances 4.2.8 Transient situations 4.2.9 Demountability, recycling, and environmental care)

    5 Structural integrity 71

    5.1 Fire resistance 71 (5.1.1 General 5.1.2 Load bearing function 5.1.3 Separating function)

    5.2 Prevention of progressive collapse 78 (5.2.1 General 5.2.2 Design considerations 5.2.3 Structural integrity 5.2.4 Analysis of collapse mechanisms 5.2.5 Conclusion)

    5.3 Seismic structures 86 (5.3.1 General 5.3.2 Actions on structural elements 5.3.3 Connections)

    Copyright fib, all rights reserved. This PDF copy of fib Bulletin 43 is intended for use and/or distribution only within National Member Groups of fib.

  • fib Bulletin 43: Structural connections for precast concrete buildings v

    PART II Basic force transfer mechanisms 6 Transfer of compressive force 93

    6.1 Principles for