440.2R-17: Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures

440.2R-17: Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures

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Description

Fiber-reinforced polymer (FRP) systems for strengthening concrete structures are an alternative to traditional strengthening techniques such as steel plate bonding, section enlargement, and external post-tensioning. FRP strengthening systems use FRP composite materials as supplemental externally-bonded or near-surface-mounted reinforcement. FRP systems offer advantages over traditional strengthening techniques: they are lightweight, relatively easy to install, and noncorroding. Due to the characteristics of FRP materials as well as the behavior of members strengthened with FRP, specific guidance on the use of these systems is needed. This guide offers general information on the history and use of FRP strengthening systems; a description of the material properties of FRP; and recommendations on the engineering, construction, and inspection of FRP systems used to strengthen concrete structures. This guide is based on the knowledge gained from experimental research, analytical work, and field applications of FRP systems used to strengthen concrete structures.

Keywords: aramid fibers; bridges; buildings; carbon fibers; corrosion; cracking; development length; earthquake resistance; fiber-reinforced polymers; structural design.

Document Details

Author: ACI Committee 440

Publication Year: 2017

Pages: 112

ISBN: 9781945487590

Categories: Fiber-Reinforced Polymers(FRP)

Formats: Printed Document, PDF, ePub, or Kindle

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE

1.1—Introduction

1.2—Scope

CHAPTER 2—NOTATION AND DEFINITIONS

2.1—Notation

2.2—Definitions

CHAPTER 3—BACKGROUND INFORMATION

3.1—Historical development

3.2—Commercially available externally bonded FRP systems

CHAPTER 4—CONSTITUENT MATERIALS AND PROPERTIES

4.1—Constituent materials

4.2—Physical properties

4.3—Mechanical properties

4.4—Time-dependent behavior

4.5—Durability

4.6—FRP systems qualification

CHAPTER 5—SHIPPING, STORAGE, AND HANDLING

5.1—Shipping

5.2—Storage

5.3—Handling

CHAPTER 6—INSTALLATION

6.1—Contractor competency

6.2—Temperature, humidity, and moisture considerations

6.3—Equipment

6.4—Substrate repair and surface preparation

6.5—Mixing of resins

6.6—Application of FRP systems

6.7—Alignment of FRP materials

6.8—Multiple plies and lap splices

6.9—Curing of resins

6.10—Temporary protection

CHAPTER 7—INSPECTION, EVALUATION, AND ACCEPTANCE

7.1—Inspection

7.2—Evaluation and acceptance

CHAPTER 8—MAINTENANCE AND REPAIR

8.1—General

8.2—Inspection and assessment

8.3—Repair of strengthening system

8.4—Repair of surface coating

CHAPTER 9—GENERAL DESIGN CONSIDERATIONS

9.1—Design philosophy

9.2—Strengthening limits

9.3—Selection of FRP systems

9.4—Design material properties

CHAPTER 10—FLEXURAL STRENGTHENING

10.1—Nominal strength

10.2—Reinforced concrete members

10.3—Prestressed concrete members

10.4—Moment redistribution

CHAPTER 11—SHEAR STRENGTHENING

11.1—General considerations

11.2—Wrapping schemes

11.3—Nominal shear strength

CHAPTER 12—STRENGTHENING OF MEMBERS SUBJECTED TO AXIAL FORCE OR COMBINED AXIAL AND BENDING FORCES

12.1—Pure axial compression

12.2—Combined axial compression and bending

12.3—Ductility enhancement

12.4—Pure axial tension

CHAPTER 13—SEISMIC STRENGTHENING

13.1—Background

13.2—FRP properties for seismic design

13.3—Confinement with FRP

13.4—Flexural strengthening

13.5—Shear strengthening

13.6—Beam-column joints

13.7—Strengthening reinforced concrete shear walls

CHAPTER 14—FIBER-REINFORCED POLYMER REINFORCEMENT DETAILS

14.1—Bond and delamination

14.2—Detailing of laps and splices

14.3—Bond of near-surface-mounted systems

CHAPTER 15—DRAWINGS, SPECIFICATIONS, AND SUBMITTALS

15.1—Engineering requirements

15.2—Drawings and specifications

15.3—Submittals

CHAPTER 16—DESIGN EXAMPLES

16.1—Calculation of FRP system tensile properties

16.3—Flexural strengthening of an interior reinforced concrete beam with FRP laminates

16.4—Flexural strengthening of an interior reinforced concrete beam with near-surface-mounted FRP bars

16.5—Flexural strengthening of an interior prestressed concrete beam with FRP laminates

16.6—Shear strengthening of an interior T-beam

16.7—Shear strengthening of an exterior column

16.8—Strengthening of a noncircular concrete column for axial load increase

16.9—Strengthening of a noncircular concrete column for increase in axial and bending forces

16.11—Lap-splice clamping for seismic strengthening

16.12—Seismic shear strengthening

16.13—Flexural and shear seismic strengthening of shear walls

CHAPTER 17—REFERENCES

Authored documents

APPENDIX A—MATERIAL PROPERTIES OF CARBON, GLASS, AND ARAMID FIBERS

APPENDIX B—SUMMARY OF STANDARD TEST METHODS

APPENDIX C—AREAS OF FUTURE RESEARCH

APPENDIX D—METHODOLOGY FOR COMPUTATION OF SIMPLIFIED P-M INTERACTION DIAGRAM FOR NONCIRCULAR COLUMNS

ERRATA INFO

Any applicable errata are included with individual documents at the time of purchase. Errata are not included for collections or sets of documents such as the Manual of Concrete Practice (MCP). For a listing of and access to all product errata, visit the Errata page.

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