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Title: 440.2R-08 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures
Number of Pages: 76
This document is: Active
Nonmember Price: $87.50
ACI Member Price: $53.00
Order Code: 440208
Abstract: 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 reinforcement. FRP systems offer advantages over traditional strengthening techniques: they are lightweight, relatively easy to install, and are noncorrosive. 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 document offers general information on the history and use of FRP strengthening systems; a description of the unique material properties of FRP; and committee recommendations on the engineering, construction, and inspection of FRP systems used to strengthen concrete structures. The proposed guidelines are 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; concrete; corrosion; crack widths; cracking; cyclic loading; deflection; development length; earthquake-resistant; fatigue; fiber-reinforced polymers; flexure; shear; stress; structural analysis; structural design; torsion.
Contents: PART 1—GENERAL Chapter 1—Introduction and scope, p. 440.2R-3 1.1—Introduction 1.2—Scope and limitations 1.3—Applications and use 1.4—Use of FRP systems Chapter 2—Notation and definitions, p. 440.2R-5 2.1—Notation 2.2—Definitions and acronyms Chapter 3—Background information, p. 440.2R-10 3.1—Historical development 3.2—Commercially available externally bonded FRP systems PART 2—MATERIALS Chapter 4—Constituent materials and properties, p. 440.2R-11 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 PART 3—RECOMMENDED CONSTRUCTION REQUIREMENTS Chapter 5—Shipping, storage, and handling, p. 440.2R-15 5.1—Shipping 5.2—Storage 5.3—Handling Chapter 6—Installation, p. 440.2R-16 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, p. 440.2R-19 7.1—Inspection 7.2—Evaluation and acceptance Chapter 8—Maintenance and repair, p. 440.2R-21 8.1—General 8.2—Inspection and assessment 8.3—Repair of strengthening system 8.4—Repair of surface coating PART 4—DESIGN RECOMMENDATIONS Chapter 9—General design considerations, p. 440.2R-21 9.1—Design philosophy 9.2—Strengthening limits 9.3—Selection of FRP systems 9.4—Design material properties Chapter 10—Flexural strengthening, p. 440.2R-24 10.1—Nominal strength 10.2—Reinforced concrete members 10.3—Prestressed concrete members Chapter 11—Shear strengthening, p. 440.2R-32 11.1—General considerations 11.2—Wrapping schemes 11.3—Nominal shear strength 11.4—FRP contribution to shear strength Chapter 12—Strengthening of members subjected to axial force or combined axial and bending forces, p. 440.2R-34 12.1—Pure axial compression 12.2—Combined axial compression and bending 12.3—Ductility enhancement 12.4—Pure axial tension Chapter 13—FRP reinforcement details, p. 440.2R-37 13.1—Bond and delamination 13.2—Detailing of laps and splices 13.3—Bond of near-surface-mounted systems Chapter 14—Drawings, specifications, and submittals, p. 440.2R-40 14.1—Engineering requirements 14.2—Drawings and specifications 14.3—Submittals PART 5—DESIGN EXAMPLES Chapter 15—Design examples, p. 440.2R-41 15.1—Calculation of FRP system tensile properties 15.2—Comparison of FRP systems’ tensile properties 15.3—Flexural strengthening of an interior reinforced concrete beam with FRP laminates 15.4—Flexural strengthening of an interior reinforced concrete beam with NSM FRP bars 15.5—Flexural strengthening of an interior prestressed concrete beam with FRP laminates 15.6—Shear strengthening of an interior T-beam 15.7—Shear strengthening of an exterior column 15.8—Strengthening of a noncircular concrete column for axial load increase 15.9—Strengthening of a noncircular concrete column for increase in axial and bending forces Chapter 16—References, p. 440.2R-66 16.1—Referenced standards and reports 16.2—Cited references APPENDIXES Appendix A—Material properties of carbon, glass, and aramid fibers, p. 440.2R-72 Appendix B—Summary of standard test methods, p. 440.2R-73 Appendix C—Areas of future research, p. 440.2R-74 Appendix D—Methodology for computation of simplified P-M interaction diagram for noncircular columns, p. 440.2R-75
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