ACI PRC-440.7:2022

CHAPTER 1—INTRODUCTION AND SCOPE, p. 3
1.1—Introduction, p. 3
1.2—Scope, p. 3
CHAPTER 2—NOTATION AND DEFINITIONS, p. 4
2.1—Notation, p. 4
2.2—Definitions, p. 5
3.1—Commercially available
3.2—Constituent materials, p. 7
3.3—Physical properties, p. 8
3.4—Mechanical properties, p. 8
3.5—Time-dependent behavior, p. 9
3.6—Durability, p. 10
3.7—FRP system qualification, p. 10
4.1—Shipping, p. 10
4.2—Storage, p. 10
4.3—Handling, p. 10
5.1—Contractor competency, p. 11
5.2—Temperature, humidity, and moisture considerations, p. 11
5.3—Equipment, p. 11
5.4—Substrate repair and surface preparation, p. 12
5.5—Mixing of resins, p. 12
5.6—Application of FRP systems, p. 12
5.7—Alignment of FRP materials, p. 13
5.8—Multiple plies and lap splices, p. 13
5.9—Curing of resins, p. 13
5.10—Temporary protection, p. 13
CHAPTER 6—INSPECTION, EVALUATION, AND ACCEPTANCE, p. 14
6.1—Inspection, p. 14
6.2—Evaluation and acceptance, p. 14
7.1—General, p. 15
7.2—Inspection and assessment, p. 15
7.3—Repair of strengthening system, p. 16
7.4—Repair of surface coating, p. 16
8.1—Design philosophy, p. 16
8.2—Existing masonry strength, p. 17
8.3—Strengthening limits, p. 17
8.4—Design material properties, p. 17
9.1—General, p. 18
9.2—Nominal flexural strength of FRP-strengthened masonry walls subjected to out-of-plane loads, p. 19
9.3—Serviceability, p. 21
9.4—Creep rupture stress limits, p. 21
10.1—General, p. 21
10.2—Nominal shear strength of FRP-strengthened masonry walls subjected to in-plane loads, p. 22
10.3—FRP contribution to shear strength, p. 23
10.4—Nominal flexural strength of FRP-strengthened walls subjected to in-plane loads, p. 24
10.5—Wall strengthening for shear and flexure, p. 24
11.1—General, p. 24
11.2—Design considerations, p. 25
12.1—General, p. 25
12.2—Pure axial compression, p. 25
12.3—Combined axial compression and bending, p. 27
13.1—Development length, p. 28
13.2—Lap splices, p. 28
13.3—Groove dimensions for NSM systems, p. 28
13.4—Spacing limits, p. 29
13.5—Anchorage of FRP reinforcement, p. 29
13.6—Load path continuity, p. 30
14.1—Engineering requirements, p. 31
14.2—Drawings and specifications, p. 31
14.3—Submittals, p. 31
15.1—Increasing the flexural capacity of an unreinforced CMU wall subjected to out-of-plane loads, p. 32
15.2—Increasing the shear and flexural capacities of an unreinforced CMU wall subjected to in-plane loads, p. 38
15.3—Increasing the flexural capacity of a reinforced masonry wall subjected to out-of-plane loads, p. 46
15.4—Restoring the strength of a cracked URM wall, p. 55
15.5—Increasing the axial capacity of a URM column subjected to axial loads, p. 61
APPENDIX A—MATERIAL PROPERTIES OF CARBON, GLASS, AND ARAMID FIBERS, p. 70
APPENDIX B—SUMMARY OF STANDARD TEST METHODS, p. 71

This guide provides recommendations for the selection and design of FRP systems limited to externally bonded FRP laminates and near-surface-mounted (NSM) FRP bars/strips for increasing or restoring the in-plane and out-of-plane strength of undamaged or damaged URM and RM walls and columns.