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ACI 440.7 2022

ACI 440.7 2022

$29.25

ACI PRC-440.7-22: Externally Bonded Fiber-Reinforced Polymer Systems Design and Construction for Strengthening Masonry Structures – Guide

Published By Publication Date Number of Pages
ACI 2022 77
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Fiber-reinforced polymer (FRP) systems can be used for strengthening masonry structures and masonry elements among other options such as external steel plates, section enlargement with reinforced concrete (RC) overlays or shotcrete, steel bracing, and internal steel reinforcement. FRP systems offer advantages over traditional strengthening techniques: they are lightweight, relatively easy to install, and are corrosion-resistant. Due to the characteristics of FRP materials as well as the behavior of masonry members strengthened with FRP, specific guidance on the use of these systems is needed. This document offers a description of the unique material properties of FRP and committee recommendations on the engineering, construction, and inspection of FRP systems used to strengthen masonry. These guidelines are based on the knowledge gained from experimental research, analytical work, and field applications of FRP systems used to strengthen masonry structures. Keywords: buildings; columns; confinement; cracking; cyclic loading; detailing; earthquake resistance; fiber-reinforced polymers (FRPs); fibers; flexure; masonry; shear; strengthening; structural analysis; structural design; unreinforced; walls; wind resistance.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
5 CHAPTER 1—INTRODUCTION AND SCOPE
1.1—Introduction
1.2—Scope
6 CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
7 2.2—Definitions
8 CHAPTER 3—CONSTITUENT MATERIALS AND PROPERTIES
3.1—Commercially available externally bonded FRP systems
9 3.2—Constituent materials
10 3.3—Physical properties
3.4—Mechanical properties
11 3.5—Time-dependent behavior
3.6—Durability
12 3.7—FRP system qualification
CHAPTER 4—SHIPPING, STORAGE, AND HANDLING
4.1—Shipping
4.2—Storage
4.3—Handling
13 CHAPTER 5—INSTALLATION
5.1—Contractor competency
5.2—Temperature, humidity, and moisture considerations
5.3—Equipment
5.4—Substrate repair and surface preparation
14 5.5—Mixing of resins
5.6—Application of FRP systems
15 5.7—Alignment of FRP materials
5.8—Multiple plies and lap splices
5.9—Curing of resins
5.10—Temporary protection

CHAPTER 6—INSPECTION, EVALUATION, AND ACCEPTANCE
16 6.1—Inspection
6.2—Evaluation and acceptance
17 CHAPTER 7—MAINTENANCE AND REPAIR
7.1—General
7.2—Inspection and assessment
7.3—Repair of strengthening system
18 7.4—Repair of surface coating
CHAPTER 8—GENERAL DESIGN CONSIDERATIONS
8.1—Design philosophy
8.2—Existing masonry strength
19 8.3—Strengthening limits
8.4—Design material properties
20 CHAPTER 9—WALL STRENGTHENING FOR OUT‑OF-PLANE LOADS
9.1—General
21 9.2—Nominal flexural strength of FRP-strengthened masonry walls subjected to out-of-plane loads
22 9.3—Serviceability
23 9.4—Creep rupture stress limits
CHAPTER 10—WALL STRENGTHENING FOR
IN-PLANE LOADS
10.1—General
24 10.2—Nominal shear strength of FRP-strengthened masonry walls subjected to in-plane loads
25 10.3—FRP contribution to shear strength
10.4—Nominal flexural strength of FRP-strengthened walls subjected to in-plane loads
26 10.5—Wall strengthening for shear and flexure
CHAPTER 11—STITCHING OF CRACKED MASONRY
11.1—General
27 11.2—Design considerations
CHAPTER 12—CONFINEMENT OF COLUMNS
12.1—General
12.2—Pure axial compression
29 12.3—Combined axial compression and bending
30 CHAPTER 13—DETAILING
13.1—Development length
13.2—Lap splices
13.3—Groove dimensions for NSM systems
31 13.4—Spacing limits
13.5—Anchorage of FRP reinforcement
32 13.6—Load path continuity
33 CHAPTER 14—CONSTRUCTION DOCUMENTS
14.1—Engineering requirements
14.2—Drawings and specifications
14.3—Submittals

CHAPTER 15—DESIGN EXAMPLES
34 15.1—Increasing the flexural capacity of an unreinforced CMU wall subjected to out-of-plane loads
40 15.2—Increasing the shear and flexural capacities of an unreinforced CMU wall subjected to in-plane loads
48 15.3—Increasing the flexural capacity of a reinforced masonry wall subjected to out-of-plane loads
57 15.4—Restoring the strength of a cracked URM wall
63 15.5—Increasing the axial capacity of a URM column subjected to axial loads
70 CHAPTER 16—REFERENCES
71 Authored documents
72 APPENDIX A—MATERIAL PROPERTIES OF CARBON, GLASS, AND ARAMID FIBERS
73 APPENDIX B—SUMMARY OF STANDARD TEST METHODS

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