ACI 423.10R-2016 Guide to Estimating Prestress Loss.pdf
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1、Guide to Estimating Prestress LossReported by Joint ACI-ASCE Committee 423ACI 423.10R-16First PrintingAugust 2016ISBN: 978-1-945487-13-2Guide to Estimating Prestress LossCopyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not be reproduced or co
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11、rican Concrete Institute38800 Country Club DriveFarmington Hills, MI 48331Phone: +1.248.848.3700Fax: +1.248.848.3701www.concrete.orgACI Committee Reports, Guides, and Commentaries are intended for guidance in planning, designing, executing, and inspecting construction. This document is intended for
12、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 responsibility for the stated principles.
13、 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 be restated in mandatory language f
14、or incorporation by the Architect/Engineer.ACI 423.10R-16 was adopted and published August 2016.Copyright 2016, American Concrete InstituteAll rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic o
15、r mechanical device, printed, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.1ACI 423.10R-16Guide to Estimating Prestress LossesReported by Joint ACI-AS
16、CE Committee 423Carin L. Roberts-Wollmann*, Chair Amy M. Reineke Trygestad, SecretaryTheresa M. Ahlborn*Robert W. BarnesFlorian G. BarthAsit N. BaxiRoger J. BeckerKenneth B. BondyCharles W. DolanJames P. DonnellyPierre EsselinckMartin J. FraduaWilliam L. GambleHarry A. GleichShawn P. GrossPawan R. G
17、uptaWilliam M. HaleH. R. Trey Hamilton IIICarol HayekMohammad IqbalDonald P. KlineLarry B. KrauserJason J. KrohnMark E. MooreTheodore L. NeffSami H. RizkallaJames RogersBruce W. RussellDavid H. SandersThomas C. SchaefferMorris SchupackRichard W. StoneMiroslav F. VejvodaJeffery S. VolzH. Carl WalkerZ
18、uming XiaPaul Zia*Co-chairs of subcommittee responsible for preparation of report.Subcommittee members.DeceasedConsulting MembersRobert N. Bruce Jr.Ned H. BurnsChunsheng “Steve” CaidSteven R. CloseHenry J. Cronin Jr.Ward N. Marianos Jr.Hani MelhemAntoine E. NaamanThomas E. NehilAndrea J. SchokkerThi
19、s guide is intended for estimation of prestress losses in concrete structures. Methods presented include lump sum, simplified approaches addressing individual source of loss, and additional estimation methods. They address losses in pretensioned and post-tensioned members, including bonded, unbonded
20、, and external tendons. Note that these estimation methods have not been evalu-ated for relative merits. A discussion of the variability of prestress losses caused by the variability in concrete properties is also presented. Several example problems are included.Keywords: creep; friction; post-tensi
21、oning; prestress loss; prestressed concrete; relaxation; shrinkage.CONTENTSCHAPTER 1INTRODUCTION, p. 21.1Introduction, p. 21.2Scope, p. 21.3Historical development, p. 31.4Guide organization and use, p. 3CHAPTER 2NOTATION AND DEFINITIONS, p. 42.1Notation, p. 42.2Definitions, p. 7CHAPTER 3LUMP-SUM MET
22、HOD, p. 73.1Scope, p. 73.2Historical code requirements, p. 73.3Industry practice, p. 83.4Measured losses, p. 8American Concrete Institute Copyrighted Material www.concrete.org2 GUIDE TO ESTIMATING PRESTRESS LOSS (ACI 423.10R-16)CHAPTER 4INITIAL LOSSES, p. 124.1Scope, p. 124.2Pretensioning losses bef
23、ore transfer, p. 134.3Elastic shortening losses in pretensioned members, p. 164.4Post-tensioning losses during tensioning and transfer, p. 184.5Elastic shortening loss in post-tensioned members, p. 214.6Elastic gain under superimposed loads, p. 22CHAPTER 5LONG-TERM LOSSES: SIMPLIFIED METHOD, p. 225.
24、1Scope, p. 225.2Creep of concrete ( fpCR), p. 235.3Concrete shrinkage ( fpSH), p. 235.5AASHTO LRFD approximate estimate of time-dependent losses, p. 25CHAPTER 6LONG-TERM LOSSES: DETAILED METHODS, p. 256.1Scope, p. 256.2Creep and shrinkage models, p. 256.3Age-adjusted effective modulus approaches, p.
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