ACI 408.2R 12:2012 Edition

$33.54

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

Published By	Publication Date	Number of Pages
ACI	2012	39

Guaranteed Safe Checkout

Category: ACI

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

Description

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.

PDF Catalog

PDF Pages	PDF Title
3	CONTENTS CONTENTS
4	CHAPTER 1— INTRODUCTION AND SCOPE CHAPTER 1— INTRODUCTION AND SCOPE 1.1—Introduction 1.1—Introduction
5	1.2—Scope 1.2—Scope CHAPTER 2— NOTATION AND DEFINITIONS CHAPTER 2— NOTATION AND DEFINITIONS 2.1—Notation 2.1—Notation
6	2.2—Definitions 2.2—Definitions CHAPTER 3— BOND AND ANCHORAGE CHAPTER 3— BOND AND ANCHORAGE 3.1—Average bond stresses 3.1—Average bond stresses
7	3.2—Components of bond resistance 3.2—Components of bond resistance
8	3.3—Failure modes 3.3—Failure modes 3.4—Bond mechanisms 3.4—Bond mechanisms
9	3.5—Factors affecting bond strength under cyclic loads 3.5—Factors affecting bond strength under cyclic loads 3.5.1 Concrete compressive strength 3.5.1 Concrete compressive strength 3.5.2 Concrete cover 3.5.2 Concrete cover
10	3.5.3 Bar size 3.5.3 Bar size 3.5.4 Anchorage length 3.5.4 Anchorage length 3.5.5 Deformation (transverse rib) geometry 3.5.5 Deformation (transverse rib) geometry 3.5.6 Steel yield strength 3.5.6 Steel yield strength 3.5.7 Amount and distribution of transverse steel 3.5.7 Amount and distribution of transverse steel 3.5.8 Casting position, vibration, and revibration 3.5.8 Casting position, vibration, and revibration 3.5.9 Strain (or stress) range 3.5.9 Strain (or stress) range 3.5.10 Type and rate of loading 3.5.10 Type and rate of loading 3.5.11 Temperature 3.5.11 Temperature
11	3.5.12 Surface condition and coatings 3.5.12 Surface condition and coatings 3.5.13 Lightweight aggregate concrete 3.5.13 Lightweight aggregate concrete 3.5.14 Corrosion 3.5.14 Corrosion 3.5.15 Alkali-silica reaction 3.5.15 Alkali-silica reaction 3.5.16 Fiber-reinforced concrete 3.5.16 Fiber-reinforced concrete 3.5.17 Bond in grouted ducts used in precast structures 3.5.17 Bond in grouted ducts used in precast structures 3.6—Summary 3.6—Summary
12	CHAPTER 4— BOND BEHAVIOR UNDER CYCLIC LOADS CHAPTER 4— BOND BEHAVIOR UNDER CYCLIC LOADS 4.1—High-cycle fatigue 4.1—High-cycle fatigue
13	4.2—Correlation between fatigue and sustained loading 4.2—Correlation between fatigue and sustained loading
14	4.3—Low-cycle loading 4.3—Low-cycle loading
15	4.4—Influence of cracking on bond strength 4.4—Influence of cracking on bond strength 4.5—Debonding to increase shear strength at connections 4.5—Debonding to increase shear strength at connections
16	CHAPTER 5— ANCHORAGE UNDER HIGH-CYCLE FATIGUE CHAPTER 5— ANCHORAGE UNDER HIGH-CYCLE FATIGUE 5.1—Straight bar anchorages 5.1—Straight bar anchorages
17	5.2—Hooked bar anchorages 5.2—Hooked bar anchorages
18	5.3—Lap splices 5.3—Lap splices
19	CHAPTER 6— ANCHORAGE UNDER LOW-CYCLE LOADING CHAPTER 6— ANCHORAGE UNDER LOW-CYCLE LOADING 6.1—Straight bar anchorages 6.1—Straight bar anchorages
20	6.2—Hooked bar anchorages 6.2—Hooked bar anchorages
22	6.3—Lap splices 6.3—Lap splices
24	CHAPTER 7— ANALYTICAL BOND MODELS CHAPTER 7— ANALYTICAL BOND MODELS 7.1—Early models of local bond behavior 7.1—Early models of local bond behavior
25	7.2—Models for local bond-slip effects 7.2—Models for local bond-slip effects 7.3—Contribution of bond-slip for modeling member and structural system behavior 7.3—Contribution of bond-slip for modeling member and structural system behavior
26	7.4—Bond modeling used in evaluation of existing structures with short lap splices or discontinuous bottom bars through joints 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 7.5—Modeling of high-cycle (fatigue) loading CHAPTER 8—DESIGN AND ANALYSIS APPROACHES CHAPTER 8—DESIGN AND ANALYSIS APPROACHES 8.1—High-cycle fatigue 8.1—High-cycle fatigue
27	8.1.1 Buildings and other structures (ACI 215R) 8.1.1 Buildings and other structures (ACI 215R) 8.1.2 Bridges (AASHTO HB-17, Helgason et al. (1976)) 8.1.2 Bridges (AASHTO HB-17, Helgason et al. (1976)) 8.1.3 Offshore structures (Det Norske Veritas 1977) 8.1.3 Offshore structures (Det Norske Veritas 1977) 8.2—Low-cycle loading (earthquake loads) 8.2—Low-cycle loading (earthquake loads) 8.2.1 ACI 318-11, Chapter 21 8.2.1 ACI 318-11, Chapter 21
28	8.2.2 Joint ACI-ASCE Committee 352 8.2.2 Joint ACI-ASCE Committee 352
29	8.2.3 Joint ACI-ASCE Committee 352 8.2.3 Joint ACI-ASCE Committee 352 8.2.4 New Zealand Standards (NZS 3101:2006) 8.2.4 New Zealand Standards (NZS 3101:2006) 8.2.5 fib Model Code 8.2.5 fib Model Code 8.2.6 BS EN 1998-1:2004 (Eurocode 8) 8.2.6 BS EN 1998-1:2004 (Eurocode 8) 8.2.7 Japanese recommendations (AIJ 1990) 8.2.7 Japanese recommendations (AIJ 1990) 8.2.8 AASHTO HB-17 8.2.8 AASHTO HB-17 8.2.8.1 Columns 8.2.8.1 Columns
30	8.2.8.2 Column connections with vertical extension of the column into adjoining member) 8.2.8.2 Column connections with vertical extension of the column into adjoining member) 8.2.9 FEMA 310 8.2.9 FEMA 310 8.2.10 FEMA 356 8.2.10 FEMA 356 8.2.11 Other recommendations 8.2.11 Other recommendations
31	8.3—Recommendations 8.3—Recommendations 8.3.1 High-cycle fatigue 8.3.1 High-cycle fatigue 8.3.2 Low-cycle fatigue 8.3.2 Low-cycle fatigue CHAPTER 9— CONCLUSIONS AND RECOMMENDATIONS CHAPTER 9— CONCLUSIONS AND RECOMMENDATIONS 9.1—Monotonic loading 9.1—Monotonic loading 9.2—Cyclic loading 9.2—Cyclic loading 9.2.1 High-cycle fatigue 9.2.1 High-cycle fatigue
32	9.2.2 Low-cycle loading 9.2.2 Low-cycle loading 9.3—Recommendations for future research 9.3—Recommendations for future research CHAPTER 10— REFERENCES CHAPTER 10— REFERENCES