ACI 408.2R-2012 Report on Bond of Steel Reinforcing Bars Under Cyclic Loads.pdf
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1、ACI 408.2R-12Report on Bond of Steel Reinforcing Bars Under Cyclic LoadsReported by Joint ACI-ASCE Committee 408First PrintingSeptember 2012Report on Bond of Steel Reinforcing Bars Under Cyclic LoadsCopyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This materia
2、l may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of ACI.The technical committees responsible for ACI committee reports and standards strive to avoid ambiguities, omissions, and erro
3、rs in these documents. In spite of these efforts, the users of ACI documents occasionally find information or requirements that may be subject to more than one interpretation or may be incomplete or incorrect. Users who have suggestions for the improvement of ACI documents are requested to contact A
4、CI via the errata website at www.concrete.org/committees/errata.asp. Proper use of this document includes periodically checking for errata for the most up-to-date revisions.ACI committee documents are intended for the use of individuals who are competent to evaluate the significance and limitations
5、of its content and recommendations and who will accept responsibility for the application of the mate-rial it contains. Individuals who use this publication in any way assume all risk and accept total responsibility for the application and use of this information.All information in this publication
6、is provided “as is” without warranty of any kind, either express or implied, includ-ing but not limited to, the implied warranties of merchantability, fitness for a particular purpose or non-infringement.ACI and its members disclaim liability for damages of any kind, including any special, indirect,
7、 incidental, or con-sequential damages, including without limitation, lost revenues or lost profits, which may result from the use of this publication.It is the responsibility of the user of this document to establish health and safety practices appropriate to the specific circumstances involved wit
8、h its use. ACI does not make any representations with regard to health and safety issues and the use of this document. The user must determine the applicability of all regulatory limitations before applying the document and must comply with all applicable laws and regulations, including but not limi
9、ted to, United States Occupational Safety and Health Administration (OSHA) health and safety standards.Participation by governmental representatives in the work of the American Concrete Institute and in the develop-ment of Institute standards does not constitute governmental endorsement of ACI or th
10、e standards that it develops.Order information: ACI documents are available in print, by download, on CD-ROM, through electronic subscription, or reprint and may be obtained by contacting ACI.Most ACI standards and committee reports are gathered together in the annually revised ACI Manual of Concret
11、e Practice (MCP).American Concrete Institute38800 Country Club DriveFarmington Hills, MI 48331U.S.A.Phone: 248-848-3700Fax: 248-848-3701www.concrete.orgISBN 13: 978-0-87031-779-8 ISB: 0-87031-779-2This report summarizes research on bond strength and behavior of steel reinforcing bars under cyclic lo
12、ads. The report provides a background to bond problems, discusses the main variables affecting bond performance, and describes bond behavior under cyclic loads. Two general types of cyclic loads are addressed: high-cycle (fatigue) and low-cycle (earthquake and similar). The anchorage behaviors of st
13、raight bars, hooked bars, and lap splices are included. Analytical bond models are described, design recom-mendations are provided for both high- and low-cycle fatigue, and suggestions for further research are given.Keywords: anchorage; bar slip; bond; bond models; cyclic loads; design recommendatio
14、ns; development length; fatigue; hooks; earthquake loads; splices.CONTENTSChapter 1Introduction and scope, p. 21.1Introduction1.2ScopeChapter 2Notation and definitions, p. 32.1Notation2.2DefintionsChapter 3Bond and anchorage, p. 43.1Average bond stresses3.2Components of bond resistance3.3Failure mod
15、es3.4Bond mechanisms3.5Factors affecting bond strength under cyclic loads3.6SummaryACI 408.2R-12Report on Bond of Steel Reinforcing Bars Under Cyclic LoadsReported by Joint ACI-ASCE Committee 408Adolfo B. MatamorosChairMichael Keith ThompsonSecretaryTheresa M. AhlbornRobert W. Barnes*Jean-Jacques Br
16、aunJoAnn P. BrowningJames L. CaldwellDouglas B. Cleary*Louis J. ColarussoJames V. CoxChristian DahlDavid DarwinRichard A. DevriesRolf EligehausenAlvin C. EricsonAnthony L. FelderScott K. GrahamBilal S. HamadNeil M. HawkinsSteven E. HoldsworthJames M. LaFaveRoberto T. LeonLeRoy A. LutzStavroula J. Pa
17、ntazopoulouMax L. PorterJulio A. RamirezJohn F. SilvaRobert G. SmithAhmet Koray Tureyen*William H. Zehrt Jr.Jun ZuoConsulting membersGyorgy L. BalazsWilliam C. GallenzBrian C. GerberAllen J. HulshizerKenneth A. LuttrellDenis MitchellMikael P. J. OlsenConrad PaulsonMelvyn PreciousRichard A. Ramsey*Me
18、mber, Subcommittee on Repeated Load Effects Chair and Editor, Subcommittee on Repeated Load Effects Note: The contributions of Brett Baker are gratefully acknowledged.1ACI Committee Reports, Guides, and Commentaries are intended for guidance in planning, designing, executing, and inspecting construc
19、tion. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains. The American Concrete Institute disclaims any and all respo
20、nsibility for the stated principles. The Institute shall not be liable for any loss or damage arising therefrom.Reference to this document shall not be made in contract documents. If items found in this document are desired by the Architect/Engineer to be a part of the contract documents, they shall
21、 be restated in mandatory language for incorporation by the Architect/Engineer.ACI 408.2R-12 superseds ACI 408.2R-92 and was adopted and published September 2012.Copyright 2012, American Concrete Institute.All rights reserved including rights of reproduction and use in any form or by any means, incl
22、uding the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual repro-duction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.Chapter
23、 4Bond behavior under cyclic loads, p. 94.1High-cycle fatigue4.2Correlation between fatigue and sustained loading4.3Low-cycle loading4.4Influence of cracking on bond strength4.5Debonding to increase shear strength at connectionsChapter 5Anchorage under high-cycle fatigue, p. 135.1Straight bar anchor
24、ages5.2Hooked bar anchorages5.3Lap splicesChapter 6Anchorage under low-cycle loading, p. 176.1Straight bar anchorages6.2Hooked bar anchorages6.3Lap splicesChapter 7Analytical bond models, p. 227.1Early models of local bond behavior7.2Models for local bond-slip effects7.3Contribution of bond-slip for
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