ACI-408.2R-1992-R2005.pdf
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1、ACI 408.2R-92 (Reapproved 1999; 2005) An abstract: Report: Bond under Cyclic Loads Reported by ACI Committee 408 Denis Mitchell, Chairman William C. Black Rolf Eligehausen* NarendraK. Gosain David W. Johnston S. Ali Mirza Mikael P. J. Olsen * M m k . Subcommittee on Repated Load Effects. Editor and
2、Chairman, Subcommittee on Reputed Load Effects. Roberto Leon Secretary David Darwin* Fernando E. Fagundo Neil M. Hawkins Le Roy A. Lutz* Jack P. Mochle Tclvin Rezansoff* ParvizSoroushian ThisState-of-the-artreport summarizesthe mostrecentbackground on bond behavior under cyclic loads. The report pro
3、vides a back- ground to bondproblems,discussesthe main variablesaffectingbond performance,and describesits behavior under cyclic loads.Two gen- eraltypesof cyclic loadsare addressed:high-cycle(fatigue) and low- cycle (earthquake and similar) loads. The behavior of straight an- chorages,hooks, and sl
4、icesis included. Design recommendationsare provided for both high- and low-cycle fatigue, and suggestions for furlher researcharegiven. The purpose of this document is to review the cur- rent state-of-the-art on bond, with particular emphasis on bond under cyclic loading. Two general types of cy- cl
5、ic loads are addressed: high-cyclic(fatigue) and low- cyclic (earthquake and similar) loads. The behavior of straight anchorages, hooks, and splices under both load regimes is discussed. The report is intended to serve both designers and researches, and is organized into eight chapters. Chapters 1,
6、2, and 3 present back- ground information on bond under cyclic loading and should be of interest to a l l readers. Chapters 4, 5, and 6 dealwith results of research and development of an- alytical bond models, and should be of use primarily to ACI Committee Reports, Guides, Standard Practices, and C
7、ommentaries are intended for guidance in planning, designing, executing, and inspecting construction. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its con- tent and recommendations and who will accept responsibility for the ap
8、plication of the material it contains. The American Concrete Institute disclaims any and all responsibility 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 thi
9、s document are desired by the Architect/Engineerto be apart of the contract documents, they shall be restated in mandatory lan- guagefor incomoration bv the Architect/Engineer Mohammad R. Ehsani Peter Gergely* James 0. Jirsa* John F. McDcrmott Kenneth H. Murray Morris Schupack researchers. Chapter 7
10、 presents a review of current de- sign guidelines, from both the U.S. and abroad, deal- ing with bond under cyclic loads, and should be of particular interest to designers. Chapter 8 provides a summary of the research results and research needs. The document is meant also to serve as an introduction
11、 for designers to the basic mechanisms involved in bond, the variables that effect them, and the differences be- tween behavior under cyclic and non-cyclicloads. An extensive reference list, including similar reports, is provided for readers desiring additional details. Bond behavior of prestressing
12、 tendons and behavior under shock or impact loading are not addressed in this re- port. BOND STRESS “Bond stress” refers to the stress along the bar-con- creteinterface which modifies the steel stress along the length of the bar by transferring load between the bar and the surrounding concrete. Bond
13、 stresses in rein- ACI 408.2R-92 became effective August I . 1992. Copyright 0 1999, American Concrete Institute. All 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 or mechanical device, prin
14、ted, written. or oral, or recording for sound or visual reproduc- tion or for use in any knowledge or retrieval system or device, unless permisaion in writing is obtained from the copyright proprietors. 408.2R-1 408.2R-2 MANUAL OF CONCRETE PRACTICE U 2.5 5.0 7.5 10.0 d - b-25 db- snnl I UNCONFINED C
15、ONCRETE IN TENSION 2 CONFINED CONCRETE 3 UNCONFINED CONCRETE IN COMPRESSION Fig. I-Typical bond stress versus slip curve for monotonic loading .E Fig. 2-Cracking under cyclic loads forced concrete members arise from two distinct situa- tions. The first is anchorage or development where bars are term
16、inated. The second is flexural bond or the change of force along a bar due to a change in bending moment along the member. The efficiency of bond can be conveniently quanti- fied by looking at bond stress versus bar slippage curves that represent the change in local stress in the bar versus the tota
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