ACI CODE-355.2-22: Post-Installed Mechanical Anchors in Concrete—Qualification Requirements and Commentary

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Description

ACI CODE-355.2 prescribes testing programs and evaluation requirements for post-installed mechanical anchors intended for use in structural applications addressed by ACI 318 and subjected to static or seismic loads in tension, shear, or combined tension and shear. Criteria are prescribed for determining whether anchors are acceptable for use in uncracked concrete only, or in cracked as well as uncracked concrete. Performance categories for anchors are established, as are the criteria for assigning anchors to each category. The anchor performance categories are used by ACI 318 to assign capacity reduction factors and other design parameters.

Keywords:

anchors; cracked concrete; expansion anchors; fasteners; mechanical anchors; post-installed anchors; screw anchors; undercut anchors.

 

Document Details

Author: ACI Committee 355

Publication Year: 2022

Pages: 102

ISBN: 9781641951920

Formats: Protected PDF/Web View

Table of Contents

CHAPTER 1—GENERAL, p. 5

1.1—Scope , p. 5

1.2—General , p. 5

1.3—Purpose , p. 5

1.4—Applicability , p. 5

1.5—Interpretation , p. 6

CHAPTER 2—NOTATION AND DEFINITIONS, p. 7

2.1—Notation, p. 7

2.2—Definitions, p. 12

CHAPTER 3—REFERENCED STANDARDS, p. 14

CHAPTER 4—SIGNIFICANCE AND USE, p. 15

CHAPTER 5—GENERAL REQUIREMENTS, p. 19

5.1—Testing sequence, p. 19

5.2—Test samples, p. 29

5.3—Testing by independent testing and evaluation agency and by manufacturer, p. 29

5.4—Changes to product, p. 30

CHAPTER 6—REQUIREMENTS FOR TEST SPECIMENS, INSTALLING ANCHORS, AND CONDUCTING TESTS, p. 32

6.1—Concrete for test members, p. 32

6.2—Anchor installation, p. 32

6.3—Test methods, p. 41

6.4—Tests in cracked concrete, p. 41

6.5—General requirements for anchor behavior, p. 41

CHAPTER 7—REQUIREMENTS FOR ANCHOR IDENTIFICATION, p. 46

7.1—Determination of critical characteristics of anchors, p. 46

7.2—Specification of critical characteristics of anchors, p. 46

7.3—Verification of conformance to drawings and specifications, p. 46

CHAPTER 8—REFERENCE TESTS, p. 49

8.1—Purpose, p. 49

8.2—Reference tension tests for single anchors without spacing and edge effects (Table 5.1a, Tests 1 through 3, or Table 5.1b, Tests 1 through 5), p. 49

8.3��Required calculations using results of reference tests, p. 50

CHAPTER 9—RELIABILITY TESTS, p. 52

9.1—Purpose, p. 52

9.2—Reliability tests using reduced installation effort (Table 5.1a, Test 4, and Table 5.1b, Test 6), p. 52

9.3—Reliability in low-strength concrete with large drill bit (Table 5.1a, Test 5, and Table 5.1b, Test 7), p. 53

9.4—Reliability in high-strength concrete with small drill bit (Table 5.1a, Test 6, and Table 5.1b, Test 8), p. 53

9.5—Reliability under repeated load (Table 5.1a, Test 7, and Table 5.1b, Test 10 for screw anchors), p. 53

9.6—Reliability in cracked concrete where crack width is cycled (Table 5.1b, Test 9), p. 55

9.7—Reliability of screw anchors for brittle failure (Table 5.1a, Test 8, and Table 5.1b, Test 11), p. 57

9.8—Reliability tests of screw anchors to setting method (Table 5.1a, Tests 9, 10, and 11, or Table 5.1b, Tests 12, 13, and 14), p. 64

CHAPTER 10—SERVICE-CONDITION TESTS, p. 67

10.1—Purpose, p. 67

10.2—Service-condition tension test with single anchor and with two edges (corner) (Table 5.1a, Test 12, and Table 5.1b, Test 15), p. 67

10.3—Service-condition test at minimum edge distance and minimum spacing (Table 5.1a, Test 13, and Table 5.1b, Test 16), p. 68

10.4—Service-condition shear test for single anchors without spacing and edge effects (Table 5.1a, Test 14, and Table 5.1b, Test 17), p. 71

10.5—Service-condition, simulated seismic tension tests (Table 10.1b, Test 18), p. 72

10.6—Service condition, simulated seismic shear tests (Table 5.1b, Test 19), p. 74

10.7—Torque tests (Table 5.1a, Test 15, and Table 5.1b, Test 20) - Optional, p. 77

CHAPTER 11—ESTABLISHING ANCHOR CATEGORIES, p. 80

CHAPTER 12—PRESENTING ANCHOR DATA, p. 81

12.1—Data analysis, p. 81

12.2—Format of data sheet, p. 81

12.3—General requirements, p. 81

12.4—Contents of evaluation report, p. 81

CHAPTER 13—REQUIREMENTS FOR INDEPENDENT TESTING AND EVALUATION AGENCY, p. 84

CHAPTER 14—COMMENTARY REFERENCES, p. 85

Authored documents, p. 85

APPENDIX A1—REQUIREMENTS FOR NORMALIZATION OF RESULTS, p. 86

A1.1—Normalization of capacities to take account of concrete and steel strengths, p. 86

A1.2—Concrete breakout or splitting failure, p. 86

A1.3—Pullout and pull-through failure, p. 86

A1.4—Steel failure, p. 86

APPENDIX A2—REQUIREMENTS FOR ESTABLISHING CHARACTERISTIC CAPACITIES, p. 87

A2.1—Scope, p. 87

A2.2—Procedure, p. 87

APPENDIX A3—REQUIREMENTS FOR TEST MEMBERS, p. 88

A3.1—Tests in uncracked concrete, p. 88

A3.2—Tests in cracked concrete, p. 88

A3.3—Casting and curing of test members, p. 89

APPENDIX B—EXAMPLE OF EVALUATION OF AN EXPANSION ANCHOR FOR USE IN UNCRACKED CONCRETE, p. 90

B1—Anchor specifications, p. 90

B2—Test results, p. 91

B3—Evaluation, p. 92

B3.1—General, p. 92

B3.2—Reference tests in uncracked low-strength concrete, p. 92

B3.3—Reference tests in uncracked high-strength concrete, p. 93

B3.4—Reliability tests, reduced installation effort, p. 93

B3.5—Reliability tests, large hole diameter, p. 94

B3.6—Reliability tests, small hole diameter, p. 94

B3.7—Reliability tests, repeated load, p. 94

B3.8—Service-condition tests, corner test, p. 95

B3.9—Service-condition tests, minimum edge distance, and spacing, p. 96

B3.10—Service-condition tests, shear tests, p. 96

B4—Establishing anchor category, p. 97

B5—Report of anchor data, p. 98

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