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ACI 440.2R 17:2017 Edition

ACI 440.2R 17:2017 Edition

$52.27

440.2R-17: Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, First Printing: May 2017 – Errata as of August 22, 2017

Published By Publication Date Number of Pages
ACI 2017 116
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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.

PDF Catalog

PDF Pages PDF Title
5 CHAPTER 1—INTRODUCTION AND SCOPE
1.1—Introduction
6 1.2—Scope
8 CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
11 2.2—Definitions
12 CHAPTER 3—BACKGROUND INFORMATION
3.1—Historical development
3.2—Commercially available externally bonded FRP systems
13 CHAPTER 4—CONSTITUENT MATERIALS AND PROPERTIES
4.1—Constituent materials
14 4.2—Physical properties
4.3—Mechanical properties
15 4.4—Time-dependent behavior
16 4.5—Durability
4.6—FRP systems qualification
17 CHAPTER 5—SHIPPING, STORAGE, AND HANDLING
5.1—Shipping
5.2—Storage
5.3—Handling
CHAPTER 6—INSTALLATION
18 6.1—Contractor competency
6.2—Temperature, humidity, and moisture considerations
6.3—Equipment
6.4—Substrate repair and surface preparation
19 6.5—Mixing of resins
6.6—Application of FRP systems
20 6.7—Alignment of FRP materials
6.8—Multiple plies and lap splices
6.9—Curing of resins
21 6.10—Temporary protection
CHAPTER 7—INSPECTION, EVALUATION, AND ACCEPTANCE
7.1—Inspection
7.2—Evaluation and acceptance
22 CHAPTER 8—MAINTENANCE AND REPAIR
8.1—General
8.2—Inspection and assessment
23 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
24 9.3—Selection of FRP systems
25 9.4—Design material properties
26 CHAPTER 10—FLEXURAL STRENGTHENING
10.1—Nominal strength
10.2—Reinforced concrete members
31 10.3—Prestressed concrete members
33 10.4—Moment redistribution
CHAPTER 11—SHEAR STRENGTHENING
34 11.1—General considerations
11.2—Wrapping schemes
11.3—Nominal shear strength
36 CHAPTER 12—STRENGTHENING OF MEMBERS SUBJECTED TO AXIAL FORCE OR COMBINED AXIAL AND BENDING FORCES
12.1—Pure axial compression
38 12.2—Combined axial compression and bending
12.3—Ductility enhancement
39 12.4—Pure axial tension
CHAPTER 13—SEISMIC STRENGTHENING
40 13.1—Background
13.2—FRP properties for seismic design
13.3—Confinement with FRP
42 13.4—Flexural strengthening
43 13.5—Shear strengthening
13.6—Beam-column joints
13.7—Strengthening reinforced concrete shear walls
45 CHAPTER 14—FIBER-REINFORCED POLYMER REINFORCEMENT RESULTS
14.1—Bond and delamination
46 14.2—Detailing of laps and splices
47 14.3—Bond of near-surface-mounted systems
48 CHAPTER 15—DRAWINGS, SPECIFICATIONS, AND SUBMITTALS
15.1—Engineering requirements
15.2—Drawings and specifications
15.3—Submittals
49 CHAPTER 16—DESIGN EXAMPLES
16.1—Calculation of FRP system tensile properties
52 16.3—Flexural strengthening of an interior reinforced concrete beam with FRP laminates
58 16.4—Flexural strengthening of an interior reinforced concrete beam with near-surface-mounted FRP bars
64 16.5—Flexural strengthening of an interior prestressed concrete beam with FRP laminates
70 16.6—Shear strengthening of an interior T-beam
73 16.7—Shear strengthening of an exterior column
75 16.8—Strengthening of a noncircular concrete column for axial load increase
78 16.9—Strengthening of a noncircular concrete column for increase in axial and bending forces
88 16.11—Lap-splice clamping for seismic strengthening
90 16.12—Seismic shear strengthening
93 16.13—Flexural and shear seismic strengthening of shear walls
99 CHAPTER 17—REFERENCES
100 Authored documents
107 APPENDIX A—MATERIAL PROPERTIES OF CARBON, GLASS, AND ARAMID FIBERS
109 APPENDIX B—SUMMARY OF STANDARD TEST METHODS
110 APPENDIX C—AREAS OF FUTURE RESEARCH
111 APPENDIX D—METHODOLOGY FOR COMPUTATION OF SIMPLIFIED P-M INTERACTION DIAGRAM FOR NONCIRCULAR COLUMNS

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