ACI CODE-355.2-24: Post-Installed Mechanical Anchors in Concrete—Qualification Requirements and Commentary

Description

This Code prescribes testing programs and evaluation requirements for post-installed mechanical anchors intended for use in structural applications addressed by ACI CODE-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 CODE-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: 2024

Pages: 118

ISBN: 9781641952682

Formats: Protected PDF/Web View

Table of Contents

CHAPTER 1—GENERAL, p. 4

1.1—Scope , p. 4

1.2—General , p. 4

1.3—Purpose , p. 4

1.4—Applicability, p. 4

1.5—Interpretation , p. 5

CHAPTER 2—NOTATION AND DEFINITIONS, p. 6

2.1—Notation, p. 6

2.2—Definitions, p. 10

CHAPTER 3—REFERENCED STANDARDS, p. 13

CHAPTER 4—SIGNIFICANCE AND USE, p. 14

4.1, p. 14

CHAPTER 5—GENERAL REQUIREMENTS, p. 18

5.1—Testing sequence and required tests for qualification, p. 18

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. 31

6.1—Concrete for test members, p. 31

6.2—Anchor installation, p. 31

6.3—Test methods, p. 39

6.4—Tests in cracked concrete, p. 39

6.5—General requirements for anchor behavior, p. 40

CHAPTER 7—REQUIREMENTS FOR ANCHOR IDENTIFICATION, p. 44

7.1—Determination of critical characteristics of anchors, p. 44

7.2—Specification of critical characteristics of anchors, p. 44

7.3—Verification of conformance to drawings and specifications, p. 44

CHAPTER 8—REFERENCE TESTS, p. 47

8.1—Purpose, p. 47

8.2—Reference tension tests for single anchors without spacing and edge effects (Table 5.1a, Tests 1, 2, and 3, or Table 5.1b, Tests 1, 2, 3, 4, and 5), p. 47

8.3—Required calculations using results of reference tests, p. 48

CHAPTER 9—RELIABILITY TESTS, p. 50

9.1—Purpose, p. 50

9.2—Reliability tests using reduced installation effort (Table 5.1a, Test 4, and Table 5.1b, Test 6), p. 50

9.3—Reliability in low-strength concrete with large drill bit (Table 5.1a, Test 5, and Table 5.1b, Test 7), p. 51

9.4—Reliability in high-strength concrete with small drill bit (Table 5.1a, Test 6, and Table 5.1b, Test 8), p. 51

9.5—Reliability under repeated load (Table 5.1a, Test 7, and Table 5.1b, Test 10 for screw anchors), p. 51

9.6—Reliability in cracked concrete where crack width is cycled (Table 5.1b, Test 9), p. 53

9.7—Reliability of screw anchors for brittle failure (Table 5.1a, Test 8, and Table 5.1b, Test 11), p. 55

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. 63

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—Torque tests (Table 5.1a, Test 15, and Table 5.1b, Test 18) – Optional, p. 71

10.6—Seismic tests (Table 5.1b, Tests 3a, 4a, 17a, 19, 20, and 21), p. 72

10.7—Assessment of seismic tests, p. 86

10.8—Determination of seismic characteristic strengths, p. 98

10.9—Reporting of seismic attributes, p. 100

CHAPTER 11—ESTABLISHING ANCHOR CATEGORIES, p. 101

11.1, p. 101

11.2, p. 101

CHAPTER 12—PRESENTING ANCHOR DATA, p. 102

12.1—Data analysis, p. 102

12.2—Format of data sheet, p. 102

12.3—General requirements, p. 102

12.4—Contents of evaluation report, p. 102

CHAPTER 13—REQUIREMENTS FOR INDEPENDENT TESTING AND EVALUATION AGENCY, p. 105

13.1, p. 105

13.2, p. 105

CHAPTER 14—COMMENTARY REFERENCES, p. 106

Authored documents, p. 106

APPENDIX A1—REQUIREMENTS FOR NORMALIZATION OF RESULTS, p. 107

A1.1—Normalization of capacities to take account of concrete and steel strengths, p. 107

A1.2—Concrete breakout or splitting failure, p. 107

A1.3—Pullout and pull-through failure, p. 107

A1.4—Steel failure, p. 107

APPENDIX A2—REQUIREMENTS FOR ESTABLISHING CHARACTERISTIC CAPACITIES, p. 108

A2.1—Scope, p. 108

A2.2—Procedure, p. 108

APPENDIX A3—REQUIREMENTS FOR TEST MEMBERS, p. 109

A3.1—Tests in uncracked concrete, p. 109

A3.2—Tests in cracked concrete, p. 109

A3.3—Casting and curing of test members, p. 110

APPENDIX B—EXAMPLE OF EVALUATION OF AN EXPANSION ANCHOR FOR USE IN UNCRACKED CONCRETE, p. 111

B1—Anchor specifications, p. 111

B2—Test results, p. 111

B3—Evaluation, p. 112

B4—Establishing anchor category, p. 117

B5—Report of anchor data, p. 118

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