408.2R-12 Report on Bond of Steel Reinforcing Bars Under Cyclic Loads

408.2R-12 Report on Bond of Steel Reinforcing Bars Under Cyclic Loads

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This report summarizes research on bond strength and behavior of steel reinforcing bars under cyclic loads. 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 straight bars, hooked bars, and lap splices are included. Analytical bond models are described, design recommendations 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 recommendations; development length; fatigue; hooks; earthquake loads; splices.

Document Details

Author: Joint ACI-ASCE Committee 408

Publication Year: 2012

Pages: 35.00


Categories: Bond

Formats: PDF, ePub, or Kindle

Table of Contents

Chapter 1—Introduction and scope



Chapter 2—Notation and definitions



Chapter 3—Bond and anchorage

3.1—Average bond stresses

3.2—Components of bond resistance

3.3—Failure modes

3.4—Bond mechanisms

3.5—Factors affecting bond strength under cyclic loads


Chapter 4—Bond behavior under cyclic loads

4.1—High-cycle fatigue

4.2—Correlation between fatigue and sustained loading

4.3—Low-cycle loading

4.4—Influence of cracking on bond strength

4.5—Debonding to increase shear strength at connections

Chapter 5—Anchorage under high-cycle fatigue

5.1—Straight bar anchorages

5.2—Hooked bar anchorages

5.3—Lap splices

Chapter 6—Anchorage under low-cycle loading

6.1—Straight bar anchorages

6.2—Hooked bar anchorages

6.3—Lap splices

Chapter 7—Analytical bond models

7.1—Early models of local bond behavior

7.2—Models for local bond-slip effects

7.3—Contribution of bond-slip for modeling member and structural system behavior

7.4—Bond modeling used in evaluation of existing structures with short lap splices or discontinuous bottom bars through joints

7.5—Modeling of high-cycle (fatigue) loading

Chapter 8—Design and analysis approaches

8.1—High-cycle fatigue

8.2—Low-cycle loading (earthquake loads)


Chapter 9—Conclusions and recommendations

9.1—Monotonic loading

9.2—Cyclic loading

9.3—Recommendations for future research

Chapter 10—References


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