ACI PRC-549.6-20: Guide to Design and Construction of Externally Bonded Fabric-Reinforced Cementitious Matrix (FRCM) and Steel-Reinforced Grout (SRG) Systems for Repair and Strengthening Masonry Structures

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Description

This guide addresses the use of externally bonded (EB) fabric-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) systems for repair and strengthening of masonry structures. FRCM and SRG are composite materials composed of a reinforcement in the form of open fabric bonded on the masonry surface through an inorganic matrix. In particular, the structural reinforcement for FRCM consists of an open grid fabric of continuous fibers made of carbon, alkali-resistant (AR) glass, polyparaphenylene benzobisoxazole (PBO), aramid, or basalt fibers, while SRG systems use steel cords of twisted wires arranged to form a unidirectional fabric. The matrixes are typically based on combinations of portland cement, silica fume, and fly ash as the binder (cement-based), or on natural hydraulic lime (lime-based), or even on geopolymer (geopolymer-based). FRCM and SRG systems represent an alternative to traditional strengthening techniques such as steel tie rods, section enlargement, or even fiber-reinforced polymer (FRP) systems. FRCM and SRG systems can be used for various structural purposes—for example, they are used to: 1) increase the loadbearing capacity of structural members; 2) improve the seismic capacity of buildings; 3) counteract specific incipient or already developed damage; 4) limit opening of cracks; and 5) strengthen local weaknesses. Based on experimental research, analytical work, and field applications, this guide provides the recommendations for the design and structural evaluation of FRCM and SRG systems according to both American and European existing regulations and guidelines.

Keywords:

composites; confinement; earthquake-resistant; fabric-reinforced cementitious matrix; lap splices; mortar matrix; steel-reinforced grout; structural analysis; structural design.

 

Document Details

Author: ACI Committee 549

Pages: 162

ISBN: 9781641951203

Categories: Design, Masonry, Repair

Formats: Protected PDF/Web View

Table of Contents

CHAPTER 1—INTRODUCTION, p. 2

1.1—Introduction, p. 2

1.2—Scope, p. 3

CHAPTER 2—NOTATION AND DEFINITIONS, p. 3

2.1—Notation, p. 3

2.2—Definitions, p. 10

CHAPTER 3—SCIENTIFIC BACKGROUND, p. 10

3.1—FRCM/SRG systems characteristics, p. 10

3.2—Historical development, p. 11

3.3—FRCM/SRG mechanical properties, p. 11

3.4—Strengthening of masonry, p. 15

3.5—Examples of commercially available FRCM/SRG systems, p. 23

CHAPTER 4—FIELD APPLICATION EXAMPLES, p. 24

4.1—Application procedure, p. 25

4.2—Strengthening of masonry walls, p. 28

4.3—Strengthening of masonry arches and vaults, p. 32

4.4—Confinement of masonry columns, p. 37

CHAPTER 5—MATERIAL CHARACTERISTICS AND SYSTEM QUALIFICATION, p. 39

5.1—Experimental tests for material characterization, p. 39

5.2—Determination of qualification parameters, p. 44

CHAPTER 6—GENERAL DESIGN CONSIDERATIONS, p. 46

6.1—Design philosophy, p. 47

6.2—Strengthening limits, p. 48

6.3—FRCM/SRG design properties, p. 48

6.4—Design supported by testing, p. 49

CHAPTER 7—OUT-OF-PLANE STRENGTHENING OF WALLS, p. 49

7.1—Out-of-plane flexural strengthening, p. 49

7.2—Crowning-beams and ties, p. 52

CHAPTER 8—IN-PLANE STRENGTHENING OF WALLS, p. 56

8.1—Introduction, p. 56

8.2—Design assumptions, p. 56

8.3—In-plane shear capacity of unreinforced masonry walls (URM), p. 58

8.4—In-plane shear capacity of FRCM/SRG-strengthened masonry walls, p. 59

8.5—In-plane flexural strength of FRCM/SRG-strengthened masonry walls, p. 60

8.6—Experimental validation, p. 61

CHAPTER 9—CONFINEMENT OF COLUMNS, p. 62

9.1—Introduction, p. 62

9.2—Design rules, p. 62

9.3—Design axial strength, p. 64

9.4—Design limitations, p. 65

9.5—Experimental validation, p. 65

CHAPTER 10—STRENGTHENING OF VAULTS, p. 65

10.1—Introduction, p. 65

10.2—Design assumptions, p. 66

10.3—Design by kinematic approach, p. 67

10.4—Design by static approach, p. 70

CHAPTER 11—REINFORCEMENT DETAILS, DRAWINGS, SPECIFICATIONS, AND SUBMITTALS, p. 72

11.1—Bond and delamination, p. 72

11.2—Transverse connectors against leaf/wythe separation, p. 72

11.3—Engineering requirements, p. 73

11.4—Drawings and specifications, p. 73

11.5—Submittals, p. 73

11.6—Quality control, p. 73

11.7—Inspection and assessment, p. 74

CHAPTER 12—DESIGN EXAMPLES, p. 74

CHAPTER 13—REFERENCES, p. 151

Authored documents, p. 151

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